Table Of Contents
1.1.31 Version Software Release Notes Cisco WAN MGX 8850, 8230, and 8250 Software
Features Introduced in Release 1.1.31
MGX 8850, MGX 8250, and MGX 8230 Feature and Availability Overview:
Independent Service Rate on FRSM-HS1/B
Standard ABR on FRSM-8 and FRSM8-C Modules
ForeSight and Standard ABR Coexistence Guidelines
VISM 2.0.0 on MGX 8230/8250/8850
Features NOT supported in Release 1.1.31
Features Introduced in Release 1.1.25
Features Introduced in Release 1.1.24
Continued Support for the MGX 8850
Features Introduced in Release 1.1.23
Release 1.1.31 MGX 8850, MGX 8230, and MGX 8250 Hardware
MGX 8220 Hardware Not Supported on Release 1.1.31 of the MGX 8850
MGX 8220 Hardware that has been superseded on the MGX 8850 by MGX 8850-specific Hardware
MGX 8220 Hardware Not Supported on the MGX 8850
Features Not Supported in this Release
Major Network Management Features
ForeSight and Standard ABR Coexistence Guidelines
CLI modification and changes in this release
Problems Fixed in Release 1.1.31
Problems Fixed in Release 1.1.25
Problems Fixed in Release 1.1.24
Problems Fixed in Release 1.1.23
MGX 8230/8250/8850 Software Interoperability with other products
MGX 8850 Firmware Compatibility
MGX 8250 Firmware Compatibility
MGX 8230 Firmware Compatibility
Special Installation and Upgrade Requirements
Single PXM Installation Procedure
Installation Procedure For Redundant PXMs
Service Module Firmware Download Procedure
Manual Configuration of Chassis Identification
Chassis Identification During a Firmware Upgrade
Service Module Installation/Upgrade and Flashdownload Requirements.
Known Anomalies for Platform Software and Service Module Firmware
Known Anomalies for RPM release 12.1(1)T
Known Anomalies for RPM Release 12.0(5)T1
RPM Configuration Examples for MPLS-based Virtual Private Networks
One PE - Two CE Configuration - OSPF & IBPG Between PEs & EBGP between PE-CE
One PE - Two CE Configuration - OSPF & IBPG Between PEs & RIP between PE-CE
One PE - Two CE Configuration - OSPF & IBPG Between PEs & STATIC ROUTES between PE-CE
1.1.31 Version Software Release Notes Cisco WAN MGX 8850, 8230, and 8250 Software
About These Release Notes
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About the 1.1.31 Release
This is a maintenance release including all features supported up to release 1.1.25.
Features Introduced in Release 1.1.31
MGX 8850, MGX 8250, and MGX 8230 Feature and Availability Overview
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Feature Descriptions
DS3 Loopback on PXM-T3
The active PXM will be able to initiate the DS3 loopback code. That is, to program the T3 framers to generate the sequence of 16 bit FEAC codes (Far End Alarm and Control). The two main purposes are:
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send alarm or status information from far end terminal back to the near end terminal
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The active PXM will initiate this code and will run on the standby PXM also. This feature has CLI support and is supported by CWM 10.3 (which is not targeted for General Availability).
Independent Service Rate on FRSM-HS1/B
This feature provides capability to configure connection service rate in ingress direction. User can also specify EIR if connection is '0' of CIR.This feature is already implemented in FRSM-8 and FRSM-VHS.
Same functionality as provided in FRSM-8 and FRSM-VHS. This feature is not supported by CWM 10.3 (which is not targeted for General Availability).
Standard ABR on FRSM-8 and FRSM8-C Modules
The feature implements TM 4.0 ABR service on the FRSM card. The current FRSM supports a pre-standard version of congestion control- foresight. This feature provides standards compliant ABR congestion mechanism in addition to foresight. The module will generate RM cells to dynamically increase or decrease bandwidth rate. The scope involves to including all applicable modes of behavior - Source, Destination or Switch. Only relevant modes need be considered. Connections with standard ABR parameter will be mapped to appropriate queues that also will co-exist with foresight connection types.
This feature will be implemented via appropriate MIBS and CLI. This feature is supported by CWM 10.3 (which is not targeted for General Availability). ABR license (similar to foresight license) will be created. This is a billable feature. One common license for either foresight or standard ABR on FRSM. Standard ABR fulfils the standards compliance part of TM 4.0.
Standard ABR on AUSM
This feature involves implementing the standards based TM 4.0 ABR congestion control loop. The current AUSM-8 card only supports foresight, which is pre-standards based. In order to inter-operate with third party devices supporting standard ABR and AXSM card, this feature is required on AUSM card.
This calls for implementing the RM cells to perform the flow control. All three modes, EFCI, ER and RR will be considered and only modes that can be supported on the existing hardware are being implemented. Also, all appropriate behaviors namely source, destination and switch behaviors will be implemented. The connections with standard ABR parameter will be mapped to the appropriate queue. This calls out for new CLI and MIB support. Also expected for the CWM support is the appropriate formula. Due to current hardware limitation, VS/VD will not be considered. This feature is supported by CWM 10.3 (which is not targeted for General Availability).
ForeSight and Standard ABR Coexistence Guidelines
In this release, Cisco has introduced the ability to support ABR TM4.0 as well as Foresight congestion control on the FRSM and AUSM modules. This document describes the major differences between the TM 4.0 compliant standard ABR and ForeSight. It also provides guidelines for coexistence of ForeSight connections with standard ABR connections on the same network, with a worked example of how to configure the two different connection types to have similar characteristics
VBR-rt on AUSM
This feature involves implementing the standard class of service on the AUSM-8 Module. VBR-rT CoS is required for video and real time voice applications. In terms of conformance definition it is same as VBR-nRT, which is already supported. The connection parameters will be bounded by Peak Cell rate (PCR), Sustainable Cell Rate (SCR) and Maximum Burst Size (MBS). Cell Delay Variation Tolerance (CDVT) will be parameter to characterize the PCR.
This new CoS requires to be scheduled in the appropriate queue in both, the ingress and egress direction. It has lower priority than CBR but higher than VBR-nRT.
Appropriate CLI commands to configure the parameters will be implemented. Connection display command will display the connection parameters. This feature is supported by CWM 10.3 (which is not targeted for General Availability).
Stratum3 Clocking
Standard clocking in the MGX is supported with a built-in Stratum-4 clock source. For network applications that require a higher clock accuracy, the PXM-UI back card used with the Stratum-4 can be replaced with an optional PXM-UI-S3 back card that carries a Stratum-3 clock. This clock reference conforms to AT&T T1.5 and ITU G.824 specifications. Provision is also made for a Service Provider to connect an external clock source, if necessary.
Both holdover and fail-over modes are supported by the PXM-UI-S3. That is, if all clock sources fail, the Stratum-3 clock will hold the last best-known clocking frequency.
The default clock is the internal Stratum-4. Pertinent CLI and MIB support are provided for Stratum-3 configuration. The PXM-UI-S3 back card is also recognized by the Cisco WAN Manager.
Hardware Changes
A new PXM-UI-S3 backcard replaces existing PXM-UI-B cards.
CLI
A new Cli cnfclklevel has been introduced which permits the user to set the STRATUM level desired.
Default Settings
The default clock source is set to be the Internal Oscillator. Subsequently, an External/Inband/SM clock can be configured to be the primary/secondary clock driving the node.
Limitations
There are 2 physical ports on the PXM-UI-S3 backcard for providing External clock. However, only "Ext Clk 1" is currently supported. There are 2 physical LAN ports on the PXM-UI-S3 backcard. However, only "LAN port 1" is currently supported.
Warning
* cnfclklevel 3
* cnfextclk (with T1/E1 option)
CoS Map for FRSM-8
This feature implements the ATM class of service (CoS) on the FRSM-8 Module. Based on our current design of hardware and software, this involves map the connection with ATM class of service parameters to appropriate queue in the ingress side of FRSM-8 and on the PXM.
The current version does not support any CoS type of connections - only foresight and non-foresight type connections. By map the CoS parameters the connections can then be scheduled in the appropriate queue on the PXM. The service types to be considered are: UBR, VBR, VBR-RT, VBR-nRT, and STD-ABR. This is in addition to the existing connection types. The current limit on connection count to be retained as far as possible. This feature is supported by CWM 10.3 (which is not targeted for General Availability).
Online Diagnostics for PXM
This feature provides capability to configure hardware oriented test to check the health of the PXM - both active and standby. This test is non-intrusive and will be able to run with minimum overhead. The results of the diagnostics will be written to a log file to be viewed offline and perform analysis. The initial goal is to not provide any intelligence.
However, built in intelligence may be considered as a future enhancement. The hardware and software components selected for running the diagnostics will be selected from the field experience. The targets are hard disk, memory components. Although the intent is to check the health of h/w a switchover should not occur except under severe circumstances.
Also, this capability of running diagnostics will be provided as an option. Appropriate CLI and SNMP interface is provided for all these features.
The Online Diagnostics are used to test components on the PXM and SRM modules while the shelf is running. Connections, states and tasks are not effected by the tests.
The diagnostic test is invoked from the active PXM. If a standby PXM exists and is in standby state, it also will be tested. When the test is executed, each component is checked and the results are presented on the screen. Results also are saved to a log file.
SRM in MGX 8230
This feature provides SRM support in MGX 8230. Only the newest version of the SRM, MGX-SRM-3T3/C, will be supported in the 8230 chassis. This feature is not supported by CWM 10.3 (which is not targeted for General Availability), but is planned for a future release.
VISM 1.5.5 on MGX 8250/8850
VISM 1.5.5 is supported on MGX 8250/8850. For VISM on MGX 8230, please use VISM 2.0.0 listed below. CWM 10.3 (which is not targeted for General Availability) supports VISM 1.5.5. VISM 1.5.5 is not targeted for General Availability.
VoIP using RTP (RFC 1889)
VISMR1.5 supports standards based VoIP using RTP (RFC1889) and RTCP protocols. This allows VISM to interwork with other VoIP Gateways.
VoAAL2 (With sub-cell multiplexing) PVC
The VISM supports standards compliant AAL2 adaptation for the transport of voice over an ATM infrastructure. AAL2 trunking mode is supported
Codec Support
G.711 PCM (A-law, Mu-law), G.726, G.729a/b
8 T1/E1 Interfaces
The VISM supports 8 T1 or 8 E1 interfaces when G.711 PCM coding is used. For higher complexity coders such as G.726-32K and G.729a-8K, the density drops to 6 T1 or 5 E1 interfaces (max 145 channels)
1:N redundancy using SRM
T3 interfaces (via SRM bulk distribution)
T3 interfaces are supported using the SRM's bulk distribution capability. In this case, the T3 interfaces are physically terminated at the SRM module. The SRM module breaks out the individual T1s and distributes the T1s via the TDM backplane bus to the individual VISM cards for processing.
Echo Cancellation
The VISM provides on-board echo cancellation on a per connection basis. Up to 128 msec user-configurable near-end delay can be canceled. The echo cancellation is compliant with ITU G.165 and G.168 specifications.
Voice Activity Detection (VAD)
VISM uses VAD to distinguish between silence and voice on an active connection. VAD reduces the bandwidth requirements of a voice connection by not generating traffic during periods of silence in an active voice connection. At the far end, comfort noise is generated.
Fax/modem detection for ECAN and VAD control
The VISM continually monitors and detects fax and modem carrier tones. When carrier tone from a fax or modem is detected, the connection is upgraded to full PCM to ensure transparent connectivity. Fax and modem tone detection ensures compatibility with all voice-grade data connections.
CAS tunneling via AAL2(For AAL2 trunking mode)
The VISM in AAL2 mode facilitates transport of CAS signaling information. CAS signaling information is carried transparently across the AAL2 connection using type 3 packets. In this mode, VISM does not interpret any of the signaling information.
PRI tunneling via AAL5(For AAL2 trunking mode)
VISM supports transport of D-ch signaling information over an AAL5 VC. The signaling channel is transparently carried over the AAL5 VC and delivered to the far end. In this mode, VISM does not interpret any of the signaling messages.
Voice CAC
VISM can be configured to administer Connection Admission Control (CAC) so that the bandwidth distribution between voice and data can be controlled in AAL2 mode.
Type 3 packet for DTMF
The VISM in AAL2 mode facilitates transport of DTMF signaling information. DTMF information is carried transparently across the AAL2 connection using type 3 packets.
Dual (Redundant) PVCs for bearer/control
The VISM provides the capability to configure two PVCs for bearer/signaling traffic terminating on two external routers (dual-homing). VISM continually monitors the status of the active PVC by using OAM loopback cells. Upon detection of failure, the traffic is automatically switched over to the backup PVC.
64 K clear channel transport
The VISM supports 64 Kbps clear channel support. In this mode, all codecs are disabled and the data is transparently transported through the VISM.
DTMF relay for G.729
In VoIP mode, DTMF signaling information is transported across the connection using RTP NSE (Named Signaling Event) packets
MGCP 0.1 for VoIP with Softswitch control
VISM supports Media Gateway Control Protocol (MGCP) Version 0.1. This open protocol allows any Softswitch to interwork with the VISM module.
Resource coordination via SRCP
Simple Resource Control Protocol (SRCP) provides a hearbeat mechanism between the VISM and the softswitch. In addition, SRCP also provides the softswitch with gateway auditing capabilities.
Full COT functions
VISM provides the capability to initiate continuity test as well as provide loopbacks to facilitate continuity test when originated from the far end.
Courtesy Down
This feature provides a mechanism for graceful upgrades. By enabling this feature, no new calls are allowed on the VISM while not disrupting the existing calls. Eventually, when there are no more active calls, the card is ready for a upgrade and/or service interruption.
VISM 2.0.0 on MGX 8230/8250/8850
VISM 2.0.0 supports all of the VISM 1.5.5 features listed above. VISM 2.0.0 is supported on MGX 8230/8250/8850. CWM 10.3 (which is not targeted for General Availability) supports VISM 2.0.0. VISM is not targeted for General Availability.
PRI backhaul to the Softswitch using RUDP
The PRI backhaul capability provides PRI termination on the VISM with the Softswitch providing call control. ISDN layer 2 is terminated on the VISM and the layer 3 messages are transported to the softswitch using RUDP.
Latency Reduction (<60 ms round trip)
Significant improvements have been made to bring the roundtrip delay to less than 60 ms.
Codecs Preference
VISM provides the capability to have the codecs negotiated between the two end-points of the call. The VISM can be configured, for a given end-point, to have a prioritized list of codecs. Codec negotiation could be directly between the end-points or could be controlled by a softswitch
31 DS0 for E1 with 240 channels only
While all 31 DS0s on a E1 port can be used, there is a limitation of 240 channels per card.
Features NOT supported in Release 1.1.31
The following features are NOT supported in MGX Release 1.1.31:
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Features Introduced in Release 1.1.25
None.
Features Introduced in Release 1.1.24
While no new features are incorporated into Software Release 1.1.24, this software release does provide support to two new wide area switches, the MGX 8230 and the MGX 8250, as well as continued support for the MGX 8850 switch.
MGX 8230
he MGX 8230 functions as a feeder to the IGX, BPX or MGX 8850 switches, or can be used for bringing in service. It has a 7-slot (double-height) chassis, and the slots are oriented in the following manner:
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Figure 1 shows the MGX 8230 with its door attached. Note that there are light pipes in the door that display the status of the processor models (PXMs). Figure 2 is a conceptual drawing of an MGX 8230 showing the dimensions and the slot numbering. The slot numbering is as it appears from the front of the MGX 8230; slots 8 and 9 refer to back card slots only.
Note that the following features are not supported in this release, but are planned for future releases:
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Figure 1 MGX 8230 with Door Attached
Figure 2 MGX 8230 Dimensions
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Main Features
Release 1.0 of MGX 8230 includes:
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The MGX 8230 backplane supports a minimum of 1.2 Gbps of non-blocking switching and has a high-end limit of 21 Gbps with the PXM1. Individual line rates can range from DS0 through OC-3.
The MGX 8230 can also support a wide range of services over narrowband and mid-band user interfaces. It maps all the service traffic to and from ATM circuits based on standardized interworking methods.
The MGX 8230 supports up to 64 channelized or non-channelized T1 and E1 interfaces on a single IP + TM multiservice gateway. These interfaces support:
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Frame-based services on T3 and E3 high-speed lines are also supported.
The MGX 8230 also supports Inverse Multiplexing for ATM (IMA) to provide ATM connectivity below T3 or E3 rates via the AUSM-8T1/E1 (AUSM/B).
The modular, software-based system architecture enables it to support new features through downloadable software upgrades or new hardware modules.
The Service Resource Module-3T3 (MGX-SRM-3T3/B), when supported in a future release, will be able to support up to 64 T1 interfaces over its three T2 lines and provide 1:N redundancy for the T1 and E1 cards. This feature is described in the MGX 8230 switch documentation, but is currently not supported by the hardware.
Standards-Based Conversion to ATM
The MGX 8230 converts all user-information into 53-byte ATM cells by using the appropriate ATM Adaptation Layer (AAL) for transport over the ATM backbone network. The individual service modules segment and reassemble (SAR) cells to eliminate system bottlenecks. The following list shows the applicable AAL for each service:
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Refer to the Cisco MGX 8230 Installation and Configuration Guide for further installation and physical descriptions for the MGX 8230 switch.
MGX 8230 Cards
MGX 8230 Processor Switch Module (PXM1)
The MGX 8230 Processor Switch Module (PXM1) performs shelf control and shared-memory switching functions. It also serves as a data processing and ATM interface card. The PXM1 processor module for the MGX 8230 is identical to the PXM1 for the MGX 8250.
Primarily, the MGX 8230 PXM1 controls the switch and provides 1.2 Gbps of non-blocking, shared memory ATM switching and ATM trunking up to OC-12 speed. In addition, the PXM features:
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The PXM1 and its two types of back cards make up the required control card set. The following are model numbers of cards supported by the MGX 8230 for this release:
The following are model numbers of cards supported by the MGX 8230 for this release:
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PXM1 User Interface Back Card
The PXM1 User Interface card (PXM-UI) provides the MGX 8230 with the several user- interface ports. It mates with an PXM1 through the backplane and is installed in a back card slot (slot 8 or 9). As seen from the back of the MGX 8230, the PXM-UI will plug into the slot that is on the right side of its corresponding PXM1. The user-interface ports provide the following functions:
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The PXM UI has the following physical connectors and interfaces:
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MGX 8230 OC-3 Uplink Back Card
The MGX 8230 Uplink back card, which mates with a corresponding PXM1 through the backplane, provides the feeder trunk to the MGX switch. This uplink back card can provide either a multi-mode or single-mode fiber OC-3 interface:
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FRSM Cards
The primary function of the FRSM is to convert between the Frame Relay-formatted data and ATM/AAL5 cell-formatted data. It converts the header format and translates the address for Frame Relay port/DLCIs, ATM-Frame UNI (FUNI) port/frame address, or frame forwarding port, and the ATM virtual connection identifiers (VPI/VCIs).
The MGX 8230 supports the following FRSM models:
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The FRSM-8T1 card provides interfaces for up to eight T1 lines, each of which can support one 56 Kbps or one Nx64 Kbps FR-UNI, FR-NNI port, ATM-FUNI, or a Frame Forwarding port. Note that this unchannelized card cannot be configured to support sub-T rates.•
The FRSM-8T1-C card provides interfaces for up to eight T1 lines, each of which can support up to twenty-four 56 Kbps or Nx64 Kbps FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding ports.•
The FRSM-8E1 card provides interfaces for up to eight E1 lines, each of which can support one 56 Kbps or one Nx64 Kbps FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding port.•
The FRSM-8E1-C card provides interfaces for up to eight E1 channelized Frame Relay lines, each of which can support multiple (up to thirty-one) 56 Kbps or Nx64 Kbps FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding ports.•
The FRSM-2E3/T3 card provides interfaces for up to two T3 or E3 Frame Relay lines, each of which can support either two T3 lines (each at 44.736 Mbps) or two E3 lines (each at 34.368 Mbps) FR-UNI, FR-NNI, ATM-FUNI, or Frame Forwarding ports.•
The FRSM-2CT3 card supports interfaces for up to two T3 channelized Fame Relay lines, each of which supports 56 Kbps, 64 Kbps, Nx56 Kbps, Nx64 Kbps, T1 ports for a total of 256 ports that can be freely distributed across the two T3 lines.•
The FRSM-HS2 provides unchannelized Frame Relay service for up to 1000 user-connections over two HSSI lines on the SCSI2-2HSSI back card. The maximum rate for the card is 104 Mbps. Each port can operate in either DTE or DCE mode with incremental rates of N x T1 or N x E1 up to 52 Mbps.OC-12 Uplink Back Card
For Automatic Protection Switching (APS) requires the "B" model—an SMFLR-1-622/B.
SMFIR-1-622 Back Card
For Automatic Protection Switching (APS) requires the "B" model—an SMFIR-1-622/B.
BNC-2T3 Back Card
BNC-2E3 Back Card
Two versions of the BNC-2E3 card are available. The BNC-2E3A applies to Australia only, and the BNC-2E3 applies to all other sites that require E3 lines on the PXM uplink card.
ATM Universal Service Module
AUSM/B Front Card
AUSM/B Back Cards
The MGX-AUSM/B-8T1 and MGX-AUSM/B-8E1 use the generic 8-port T1 or E1 line modules that operate with the 8-port service modules. The standard T1 version of the back card has eight RJ-48 connectors. The standard versions of the E1 back card have either eight RJ-48 connectors or eight pairs of SMB connectors. The following back cards are compatible with the AUSM/B:
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Circuit Emulation Service Module 8T1E1
CESM Models
The MGX 8230 supports the following CESM models:
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The CESM-8T1 card provides interfaces for up to eight T1 lines, each of which is a 1.544 Mbps structured or unstructured synchronous data stream.•
The CESM-8E1 card provides interfaces for up to eight E1 lines, each of which is a 2.048 Mbps structured or unstructured synchronous data stream.•
The CESM-8T1E1 card set consists of the CESM-8T1E1 front card and one of the following back cards:
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Redundancy Architecture
Since the MGX 8230 chassis is a smaller form factor MGX 8850, most of the redundancy features available in MGX 8850 are available in MGX 8230 chassis. The following is a list of available redundancy features on the MGX 8230 chassis.
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MGX 8230 Management
To give you access for control purposes, the MGX 8230 switch supports high- and low-level user interfaces. You can use the Cisco WAN Manager application (formerly StrataView Plus) for connection management, the CiscoView application for hardware configuration, and a command line interface for low-level control of hardware functionality and connection control. An assortment of ports and protocols supports these user-interfaces. For communicating with the MGX 8230 switch, the control port (SLIP protocol only), the LAN (Ethernet) port, and the in-band ATM connection (feeder application only) all support access by the command line interface (CLI) via Telnet, TFTP, and SNMP protocols.
The downloadable firmware on each card determines the functionality, and you can upgrade functionality by downloading new firmware through a TFTP application on a workstation or a PC.
The current status and configuration parameters of the MGX 8230 modules reside in a Management Information Base (MIB). The firmware on each card updates the MIB as changes in status and configuration occur.
MGX 8250
The Cisco MGX 8250 wide-area edge switch supports:
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It does not support PNNI, despite the fact that some CLI commands may show options for PNNI.
This chapter contains a brief outline of the features of the Cisco MGX 8250 switch. An illustration of the AC-powered version of the switch appears in Figure 3.
Figure 3 MGX 8250 Switch
The Applications of the MGX 8250 Switch
The MGX 8250 switch operates in two operational applications:
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For a description of how to configure the switches for a particular application, see the MGX 8250 Switch Installation and Configuration Guide.
The switch is also capable of supporting Cisco Multiprotocol Label Switching (MPLS).
Universal Edge Architecture
The MGX 8250 switch can support a wide range of services over narrowband and mid-band user interfaces. It maps all the service traffic to and from ATM by using standardized interworking methods.
The supported interfaces for user-traffic are:
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The optional Service Resource Module-3T3 (MGX-SRM-3T3/B) can support up to 80 T1 interfaces over its three T3 lines and provide 1:N redundancy for the T1 and E1 cards.
The modular, software-based system architecture enables the switch to support new features through downloadable software upgrades or new hardware modules.
The MGX 8250 backplane supports a minimum of 1.2 Gbps of non-blocking switching. Individual line rates range from DS0 through OC-12.
Standards-Based Conversion to ATM
The MGX 8250 switch converts all user information into 53-byte ATM cells by using the appropriate ATM Adaptation Layer (AAL) for transport over the ATM backbone network. The individual service modules segment and reassemble (SAR) cells to eliminate system bottlenecks. The following list shows the applicable AAL for each service:
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MGX 8250 Cards
The MGX 8250 switch supports core cards and service modules. The Processor Switching Module (PXM) and optional Service Resource Module (SRM) are core cards. In addition to the PXM being a core card, it is also part of a a card set. A card set consists of a front card, a back card, and a daughter card. Service modules are not combined in this manner and are never part of a card set. Instead, service modules provide the interface to the transport technologies of the CPE—Frame Relay, ATM, and so on. The MGX 8250 enclosure contains up to 24 service modules (I/O cards) and 4 optional Service Redundancy Modules (SRMs) provide redundancy. A card set consists of a front card with its attached daughter card and a back card (or line module). The front card contains the processing intelligence and, on the daughter card, the firmware that distinguishes the interface (OC-3, T3, E3, and so on). The back card is a simple card that provides the electrical interface for one or more lines of a particular type. The MGX 8250 front and back cards are the:
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This front card controls the switch and supports external interfaces for user-access and trunking or UNI ports. The back cards consist of a user interface card (PXM-UI) and a broadband network module (see subsequent list items).•
The PXM1-UI is the user interface card that has various types of ports to let you access and control the switch.•
The SMFIR-1-622 is a broadband network module for the PXM and provides a SONET OC12/STM4 ATM interface at 622 Mbps.•
The MMF-4-155 is a broadband network module for the PXM and provides 4 SONET OC3/STM1 ATM interfaces at 155 Mbps.•
The MGX-BNC-2T3 is a broadband network module for the PXM and provides 2 T3 ATM interfaces.•
The MGX-BNC-2E3 is a broadband network module for the PXM and provides 2 E3 ATM interfaces. A version for Australia, New Zealand, and elsewhere is available (MGX-BNC-2E3A).•
The MGX-FRSM-2E3/T3 provides interfaces for up to two T3 or E3 frame relay lines, each of which can support either 2 T3 lines (each at 44.736 Mbps) or 2 E3 lines (each at 34.368Mbps) FR-UNI, ATM-FUNI, or Frame Forwarding port.•
The MGX-FRSM-2CT3 supports interfaces for up to two T3 channelized frame relay lines, each of which supports 56 Kbps, 64 Kbps, Nx56 Kbps, Nx64 Kbps, T1 ports for a total of 256 ports that can be freely distributed across the two T3 lines.•
The MGX-HS2/B supports interfaces for 2 unchannelized HSSI lines, each of which supports approximately 51 Mbps. With both lines operating, maximum throughput is 70 Mbps.•
The AX-FRSM-8T1 provides interfaces for up to eight T1 lines, each of which can support one 56 Kbps or one Nx64 Kbps FR-UNI, ATM-FUNI, or a Frame Forwarding port. Note that this unchannelized card cannot be configured to support sub-T rates.•
The AX-FRSM-8T1c provides interfaces for up to eight T1 lines, each of which can support up to 24 56 Kbps or N x 64 Kbps FR-UNI, ATM-FUNI, or Frame Forwarding port.•
The AX-FRSM-8E1 provides interfaces for up to eight E1 lines, each of which can support one 56 Kbps or one N x 64 Kbps FR-UNI, ATM-FUNI, or frame forwarding port.•
The AX-FRSM-8E1c provides interfaces for up to 8 E1 channelized frame relay lines Each line can support N x 64-Kbps or (up to 31) 56-Kbps FR-UNI, ATM-FUNI, or frame forwarding ports.•
The MGX-AUSM/B-8T1 provides interfaces for up to eight T1 lines. You can group N x T1 lines to form a single, logical interface (IMA).•
The MGX-AUSM/B-8E1 provides interfaces for up to eight E1 lines. You can group N x E1 lines to form a single, logical interface (IMA).•
The AX-CESM-8T1 provides interfaces for up to eight T1 lines, each of which is a 1.544 Mbps structured or unstructured synchronous data stream.•
The AX-CESM-8E1 provides interfaces for up to eight E1 lines, each of which is a 2.048-Mbps structured or unstructured synchronous data stream.•
The RPM is a Cisco 7200-series router redesigned as a double-height card. Each RPM uses two single-height back cards. The back-card types are: single-port Fast Ethernet, four-port Ethernet, and single-port (FDDI).•
The optional MGX-SRM-3T3/B provides bit error rate testing (BERT), 1:N redundancy for T1 and E1 service modules, and a de-multiplexing function for T1 service called bulk mode.•
A multi-personality back card that supports either X.21 or V.35 interface.MGX 8250 Management
To give you access for control purposes, the MGX 8250 switch supports high- and low-level user interfaces. You can use the Cisco WAN Manager application (formerly StrataView Plus) for connection management, the CiscoView application for hardware configuration, and a command line interface for low-level control of hardware functionality and connection control. An assortment of ports and protocols supports these user-interfaces. For communicating with the MGX 8250 switch, the control port (SLIP protocol only), the LAN (Ethernet) port, and the in-band ATM connection (feeder application only) all support access by the command line interface (CLI) via Telnet, TFTP, and SNMP protocols.
The downloadable firmware on each card determines the functionality, and you can upgrade functionality by downloading new firmware through a TFTP application on a workstation or a PC.
The current status and configuration parameters of the MGX 8250 modules reside in a Management Information Base (MIB). The firmware on each card updates the MIB as changes in status and configuration occur.
Continued Support for the MGX 8850
The Cisco MGX 8850 wide-area edge switch supports:
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It does not support PNNI, despite the fact that some CLI commands may show options for PNNI.
An illustration of the AC-powered version of the switch appears in Figure 4.
Figure 4 MGX 8850 Switch
The Applications of the MGX 8850 Switch
The MGX 8850 switch operates in two operational applications:
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For a description of how to configure the switches for a particular application, see the MGX 8250 Switch Installation and Configuration Guide.
The switch is also capable of supporting Cisco Multi-Protocol Label Switching (MPLS).
Universal Edge Architecture
The MGX 8850 switch can support a wide range of services over narrowband and mid-band user interfaces. It maps all the service traffic to and from ATM by using standardized interworking methods. When the MGX 8850 switch operates as a feeder, it uses a single port to communicate the aggregated traffic over an ATM interface with an MGX 8850 or BPX 8600-series switch.
The supported interfaces for user-traffic are:
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The optional Service Resource Module-3T3 (MGX-SRM-3T3/B) can support up to 80 T1 interfaces over its 3 T3 lines and provide 1:N redundancy for the T1 and E1 cards.
The modular, software-based system architecture enables the switch to support new features through downloadable software upgrades or new hardware modules.
The MGX 8850 backplane supports a minimum of 1.2 Gbps of non-blocking switching up to
45 Gbps. Individual line rates range from DS0 through OC-12.Standards-Based Conversion to ATM
The MGX 8850 switch converts all user-information into 53-byte ATM cells by using the appropriate ATM Adaptation Layer (AAL) for transport over the ATM backbone network. The individual service modules segment and reassemble (SAR) cells to eliminate system bottlenecks. The following list shows the applicable AAL for each service:
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MGX 8850 Cards
The MGX 8850 switch supports two types of card sets: the core cards (or core modules) and service modules. The Processor Switching Module (PXM) and optional Service Resource Module (SRM) are core cards. The service modules provide the interface to the transport technologies of the CPE—Frame Relay, ATM, and so on. The MGX 8850 enclosure contains up to 24 service modules (I/O cards) and 4 optional Service Redundancy Modules (SRMs) provide redundancy. A card set consists of a front card with its attached daughter card and a back card (or line module). The front card contains the processing intelligence and, on the daughter card, the firmware that distinguishes the interface (OC-3, T3, E3, and so on). The back card is a simple card that provides the electrical interface for one or more lines of a particular type. The MGX 8850 front and back cards are the:
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This front card controls the switch and supports external interfaces for user-access and trunking or UNI ports. The back cards consist of a user interface card (PXM-UI) and a broadband network module (see subsequent list items).•
The PXM1-UI is the user interface card that has various types of ports to let you access and control the switch.•
The SMFIR-1-622 is a broadband network module for the PXM and provides a SONET OC12/STM4 ATM interface at 622 Mbps.•
The MMF-4-155 is a broadband network module for the PXM and provides 4 SONET OC3/STM1 ATM interfaces at 155 Mbps.•
The MGX-BNC-2T3 is a broadband network module for the PXM and provides 2 T3 ATM interfaces.•
The MGX-BNC-2E3 is a broadband network module for the PXM and provides 2 E3 ATM interfaces. A version for Australia, New Zealand, and elsewhere is available (MGX-BNC-2E3A).•
The MGX-FRSM-2E3/T3 provides interfaces for up to two T3 or E3 frame relay lines, each of which can support either 2 T3 lines (each at 44.736 Mbps) or 2 E3 lines (each at 34.368Mbps) FR-UNI, ATM-FUNI, or Frame Forwarding port.•
The MGX-FRSM-2CT3 supports interfaces for up to two T3 channelized frame relay lines, each of which supports 56 Kbps, 64 Kbps, Nx56 Kbps, Nx64 Kbps, T1 ports for a total of 256 ports that can be freely distributed across the two T3 lines.•
The MGX-HS2/B supports interfaces for 2 unchannelized HSSI lines, each of which supports approximately 51 Mbps. With both lines operating, maximum throughput is 70 Mbps.•
The AX-FRSM-8T1 provides interfaces for up to eight T1 lines, each of which can support one 56 Kbps or one Nx64 Kbps FR-UNI, ATM-FUNI, or a Frame Forwarding port.•
The AX-FRSM-8T1c provides interfaces for up to eight T1 lines, each of which can support up to 24 56 Kbps or N x 64 Kbps FR-UNI, ATM-FUNI, or Frame Forwarding port.•
The AX-FRSM-8E1 provides interfaces for up to eight E1 lines, each of which can support one 56 Kbps or one N x 64 Kbps FR-UNI, ATM-FUNI, or frame forwarding port.•
The AX-FRSM-8E1c provides interfaces for up to 8 E1 channelized frame relay lines Each line can support N x 64-Kbps or (up to 31) 56-Kbps FR-UNI, ATM-FUNI, or frame forwarding ports.•
The MGX-AUSM/B-8T1 provides interfaces for up to eight T1 lines. You can group N x T1 lines to form a single, logical interface (IMA).•
The MGX-AUSM/B-8E1 provides interfaces for up to eight E1 lines. You can group N x E1 lines to form a single, logical interface (IMA).•
The AX-CESM-8T1 provides interfaces for up to eight T1 lines, each of which is a 1.544 Mbps structured or unstructured synchronous data stream.•
The AX-CESM-8E1 provides interfaces for up to eight E1 lines, each of which is a 2.048-Mbps structured or unstructured synchronous data stream.•
The RPM is a Cisco 7200-series router redesigned as a double-height card. Each RPM uses two single-height back cards. The back-card types are: single-port Fast Ethernet, four-port Ethernet, and single-port (FDDI).•
The optional MGX-SRM-3T3/B provides bit error rate testing (BERT), 1:N redundancy for T1 and E1 service modules, and a de-multiplexing function for T1 service called bulk mode.•
A multi-personality back card that supports either X.21 or V.35 interface.MGX 8850 Management
To give you access for control purposes, the MGX 8850 switch supports high and low-level user interfaces. You can use the Cisco WAN Manager application (formerly StrataView Plus) for connection management, the CiscoView application for hardware configuration, and a command line interface for low-level control of hardware functionality and connection control. An assortment of ports and protocols supports these user-interfaces. For communicating with the MGX 8850 switch, the control port (SLIP protocol only), the LAN (Ethernet) port, and the in-band ATM connection (feeder application only) all support access by the command line interface (CLI) via Telnet, TFTP, and SNMP protocols.
The downloadable firmware on each card determines the functionality, and you can upgrade functionality by downloading new firmware through a TFTP application on a workstation or a PC.
The current status and configuration parameters of the MGX 8850 modules reside in a Management Information Base (MIB). The firmware on each card updates the MIB as changes in status and configuration occur.
Features Introduced in Release 1.1.23
MGX 8850 Release 1.1.23 is a maintenance release of Release 1.1.22. In addition, it introduces the following new features:
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Release 1.1.31 MGX 8850, MGX 8230, and MGX 8250 Hardware
MGX 8850 is a 45 Gbps backplane with 1.2 Gbps switching fabric for Release 1.1.31. The same backplane is used with different switching fabric cards (1.2, 45 Gbps) to achieve scalability. MGX 8850 Release 1.1.31 hardware components and their revisions that are supported are as follows:
Support for embedded Cisco IOS router (Router Processor Module - RPM)
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MGX 8220 Hardware Not Supported on Release 1.1.31 of the MGX 8850
The following cards are not supported in Release 1.1.31:
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