Cisco Line Cards

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Contents

Network Management Feature Descriptions

Administrative and management access to the 1-Port CHOC-12 ISE line card is provided through the standard console and Telnet CLI as well as through SNMP network management software such as CiscoWorks 2000. For MIB information, see the "MIBs" section.

Layer 1 Software Feature Descriptions

The following subsections sections identify the major software supported features provided by the
1-Port CHOC-12 ISE line card.

SONET and SDH

The following options are configured and monitored at the port level:

STS-1 to VTG to VT1.5 to DS1

STS-1 to DS3 to DS1

AU-4 to TUG-3 to TUG-2 to VC-12 to E1

AU-3 to TUG-2 to VC-11 to DS1

DS1 Features

DS1s can be configured and monitored on a per-T1 channel basis. The 1-Port CHOC-12 ISE line card supports the following DS1 features:

E1 Features

E1s can be configured and monitored at the individual E1 channel level. The 1-Port CHOC-12 ISE line card supports the following E1 features:

Automatic Protection Switching

Automatic Protection Switching (APS) provides redundancy on SONET equipment to guard against line failures. The 1-Port CHOC-12 ISE line card supports the following APS features:

Online Insertion and Removal

The Online Insertion and Removal feature (OIR) permits the removal or insertion of a
1-Port CHOC-12 ISE line card without disrupting the packet forwarding or routing of other line cards operating in the same chassis. For additional information on OIR, see the document, Cisco 12000 Series 1-Port Channelized OC-12/STM-4 (DS1/E1) ISE Line Card Installation and Configuration at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/core/cis12000/linecard/lc_chan/13921c12.htm

Layer 2 Software Feature Descriptions

The following subsections provide an overview of the wide area network protocols supported on the 1-Port CHOC-12 ISE line card:

Cisco High-level Data Link Control Protocol

The 1-Port CHOC-12 ISE line card supports standard Cisco HDLC encapsulation.

Frame Relay Protocol

The 1-Port CHOC-12 ISE line card supports the following frame relay features:

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Note    The current Cisco IOS limitations are 2,048 IDBs per line card. Because each interface requires at least one hardware IDB and one software IDB, the limit of 1,024 DLCIs applies to each card.

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Note    Forward explicit congestion notification (FECN) and backward explicit congestion notification (BECN) signaling are not supported at this release.

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Multilink Point to Point Protocol

Compliant with the PPP Multilink Protocol (MP) RFC 1990, The 1-Port CHOC-12 ISE line card supports the following Multilink Point to Point Protocol(MLPPP) features:

Multilink Frame Relay

Compliant with the Multilink Frame Relay UNI/NNI Implementation Agreement (FRF. 16), the1-Port CHOC-12 ISE line card supports the following features:

Layer 3 Software Feature Descriptions

The 1-Port CHOC-12 ISE line card layer 3 software features are a subset of Cisco IOS 12.0(27)S1 and Cisco IOS 12.0(26)S. These features are described or referenced in the document, Cross-Platform Release Notes for Cisco IOS Release 12.0 S, Part 2: New Features and Important Notes at the following URL:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/relnote/xprn120s/120snewf.htm

How to Configure Layer 1 Features

The following sections provides the following configuration procedures for the 1-Port CHOC-12 ISE line card:

Restrictions

The 1-Port CHOC-12 ISE line card can be installed only in the Cisco 12000 Series Router. The hardware and software configuration procedures and tasks are similar to all other Cisco 12000 Series Router line cards.

Each 1-Port CHOC-12 ISE line card requires 512 interface description blocks (IDBs) describing the DS1 channels (one per DS1 channel). We recommend that you install no more than two 1-Port CHOC-12 ISE line cards on a Cisco 12000 Series Router chassis.

Configuring the SONET Controller

Summary Steps

1. enable

2. configure terminal

3. controller sonet slot/port

4. framing {sonet | sdh}

5. clock source {internal | line}

6. description string

7. report {all | event}

8. threshold type value

9. overhead s1s0 number

10. overhead c2 number

11. overhead j1 length [16 | 64]

12. overhead j1 message

Table 1 lists the SONET controller default values.

Detailed Steps:

Command or Action  Purpose  Step 1  enable Example: Router> enable Enables privileged EXEC mode. Enter your password if prompted. Step 2  configure terminal Example: Router# configure terminal Enters global configuration mode. Step 1  controller sonet slot/port Example: Router(config)# controller sonet 1/0 Selects the physical port to configure, and enters controller configuration mode. The 1-Port CHOC-12 ISE line card only has port 0. To shut down the SONET controller, use the shutdown controller command. When shut down, the OC-12/STM-4 port transmits a Line AIS (MS-AIS) signal. The received signal is ignored. Bring the SONET controller back up with the no shutdown controller command. Step 2  framing {sonet | sdh} Example: Router(config-controller)# framing sdh Specifies SONET or SDH framing type. The default is SONET framing. Step 3  clock source {internal | line} Example: Router(config-controller)# clock source line Sets the clock source for the 1-Port CHOC-12 ISE line card. Typically, an 1-Port CHOC-12 ISE line card is connected to a SONET or SDH add/drop multiplexer (ADM). In this application, Cisco recommends using the default setting of clock source line, because: The clock source used by the SONET/SDH network is of higher accuracy than the internal clock source on the 1-Port CHOC-12 ISE line card. The SONET/SDH network is designed for optimal operation in synchronous mode, where all clocks used in the network can be traced to a single high-accuracy clock source. Using the internal clock on the line card port introduces an independent clock source into the network, and may cause synchronization-related anomalies to be detected by the SONET/SDH network elements. When configured for line clocking, the 1-Port CHOC-12 ISE line card port will automatically default to internal clocking if the line clock source is considered unusable for any of the following reasons: The port detects a Loss of Signal (SLOS) defect. The port detects a Loss of Frame (LOF) defect. The port detects a Section (RS) Loss of Frame (SLOF) defect. The port detects a Line (MS) Alarm Indication Signal (LAIS) defect. The port receives the "Do not use for synchronization" code in byte S1 of the Line (MS) overhead. The port has been put into the local loopback mode through the use of the loopback local controller command. When the loopback is cleared, the port reverts to using the line clock source. Note    The OC-12/STM-4 port always sends the "Do not use for synchronization" code in byte S1 of the Line (MS) overhead toward the directly connected ADM.   Step 4  description string Example: Router(config-controller)# description E1T1Card (Optional). You can add a description of up to 80 characters about a controller to help you remember what is attached to it. The description is intended solely as a comment about the use of the controller. The description will appear in the output of the following commands: show configuration show system running config show controllers. Step 5  report {all | event} Example: Router(config-controller)# report {all | event} (Optional). Enable reporting of selected alarm and signal events. The following alarm and signal events are enabled and reported by default: sf-ber slos slof b1-tca lais b2-tca Enable reporting for the alarm and signal events individually, or use the all keyword to enable all of the available alarm and signal events. Step 6  threshold type value Example: Router(config-controller)# threshold all (Optional). Set threshold values for the BER Threshold Crossing Alarms. For further information, see the document Bit Error Rate Testing on Channelized Line Cards in Cisco 12000 Series Internet Routers at the following URL: http://www.cisco.com/univercd/cc/td/doc/product/software /ios120/120newft/120limit/120s/120s21/bert.htm Step 7  overhead s1s0 number Example: Router(config-controller)# overhead s1s0 2  (Optional). Sets S1 and S0 overhead bits. Legal values are 0 to 3. The default is 0 for SONET and 2 for SDH framing. The values for these bits are set automatically with frame type. Change the values only to ensure operability with older or nonstandard equipment, or to ensure operability if the bit values in the network are other than the defaults. For example, SDH equipment in Australia might use 1 as the SDH value. The S1 and S0 bits are located in the H1 Administrative Unit (AU) pointer byte, bit locations 5 and 6. Step 8  overhead j0 number Example: Router(config-controller)# overhead j0 82  (Optional). Sets identifier of transmitting equipment (0 to 255). Default is 1. Section trace is a maintenance feature of SONET. One byte (J0) of the Section overhead associated with each SONET frame is used to carry information identifying the transmitting equipment. Step 9  overhead c2 number Example: Router(config-controller)# au-4 1 overhead c2 or Router(config-controller)# au-3 3 Router(config-ctrlr-au3)# overhead c2 98 or Router(config-controller)# sts-1 Router(config-ctrlr-sts1)# overhead c2 98 (Optional). Legal values are 0 to 255. Defaults are as follows: 02 for vt15, c11, and c12 04 for ct3 The Signal Label field is configured at the path level configuration mode. The Path Signal Label field occupies one byte (C2) of the SONET STS Path overhead, and the SDH High Order Path overhead. This byte indicates the type of contents carried in the SONET Synchronous Payload Envelope (SPE), or SDH High Order Virtual Container (HOVC). Setting the Path Signal Label affects both the Transmitted (sent) value and the Expected value of the C2 overhead byte. Step 10  overhead j1 length [16 | 64] overhead j1 message Example: J1 configuration for SDH AU-4 mode Router(config-controller)# au-4 1 overhead j1 length 16 Router(config-controller)# au-4 1 overhead j1 message metro_SF Example: J1 configuration for SDH AU-3 mode Router(config-controller)# au-3 3 Router(config-ctrlr-au3)# overhead j1 length 16 Router(config-ctrlr-au3)# overhead j1 message metro_LA Example: J1 Configuration for SONET STS-1 mode Router(config-ctrlr-sts1)# overhead j1 length 64 Router(config-ctrlr-sts1)# overhead j1 message metro_washington gsr_0057/4/3 (Optional). The Path Trace identifier consists of two configuration settings, the message length and the message text. The default message length is 16 for SDH framing, and 64 for SONET framing. If you select a message length of 16, the actual message length can be up to 15 characters. An additional byte, prepended to the message, contains the result of a CRC7 calculated on the message. If the actual message text is fewer than 15 characters, the message text is padded to its full length with NULL characters. If you select a message length of 64 and the actual message text is fewer than 62 characters, the message text is padded with NULL characters. The last two byte positions, 63 and 64, are always CR/LF (0x0D/0x0A). The STS/High Order Path Trace Identifier (J1) is a maintenance feature of SONETand SDH. One byte (J1) of the Path overhead associated with each path in the SONET/SDH frame is used to carry information identifying the originating Path Terminating Equipment (PTE). In SDH with AU-4 mapping, the Path Trace identifier is configured at the controller level. In SDH with AU-3 mapping or in SONET framing, the Path Trace identifier is configured at the path level.

Configuring an STS-1 Mode of Operation with SONET Framing

Under SONET framing, each of the STS-1 paths can be configured to carry a set of T1s mapped into either a VT1.5 signal or a DS3 signal. The DS3 signal itself carries a set of T1s (thus becoming a channelized T3, or CT3).

Summary Steps

1. controller sonet slot/port

2. framing sonet {sonet | sdh}

3. sts-1 number

4. mode {vt-15 | ct3}

Detailed Steps

Configuring T3 Links with SONET Framing

You can configure T3 links from the STS-1 path configuration level when ct3 is the STS-1 mode of operation.

Summary Steps

1. t3 framing [auto-detect | c-bit | m23

2. t3 clock source [internal | line]

3. t3 equipment {customer | network } loopback

Detailed Steps

Command  Purpose  Step 1  t3 framing [auto-detect | c-bit | m23] Example: Router(config-crtlr-sts1)# t3 framing m23 Specifies the framing type for the T3 link. Default is auto-detect. Note    The M23 framing type might be referred to as M13 in other technical literature and on test equipment. Auto-detect identifies the framing type the line card is receiving from the far end and then transmits with that same framing type. Step 2  t3 clock source [internal | line] Example: Router(config-crtlr-sts1)# t3 clock source line Sets the clock source for the selected T3 link. The default is internal. Note    On a T3 circuit, at least one end must provide the clock source (by using the internal clock source). The other end of the T3 circuit can use either line or internal as the clock source. Step 3  t3 equipment {customer | network } loopback Example: Router(config-ctrlr-sts1)# t3 equipment customer loopback The default is t3 equipment customer loopback. The equipment customer loopback command enables the line card to respond to remote T3 link loopback commands from the remote T3 equipment . The equipment network loopback command enables the line card to ignore remote T3 link loopback commands,

Configuring T1 Lines Under SONET Framing

With SONET framing, you can configure T1s in vt-15 or in ct3 mode.

Procedures and examples for configuring T1 channel-groups on the 1-Port CHOC-12 ISE line card are presented in the following sections:

Configuring a T1 in SONET Virtural Tributary Mode

Summary Steps:

1. vtg vtg-number t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}]

2. vtg vtg-number t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]}

3. vtg vtg-number t1 t1-line-number clock source {internal | line}

Command  Purpose  Step 1  vtg vtg-number t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}] Example: Router(config-crtlr-sts1)# vtg 1 t1 1 channel-group 15 timeslots 1-5, 20-23 Creates a logical channel group for a T1 line from the STS-1 configuration level. In vt-15 mode, the range of the t1-line-number parameter is 1 to 5. The channel-group keyword defines a logical channel group to identify the set of timeslots allocated to this n x DS0 channel in the channelized T1 line (where n ranges from 1 to 24 DS0 timeslots). The timeslots keyword creates the combination of subranges . The default speed for DS0 timeslots is 64 Kbps. In this example, the first T1 line is assigned to logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23. The DS0 speed per timeslot is 64 Kbps. Step 2  vtg vtg-number t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]} Example: Router(config-crtlr-sts1)# vtg 1 t1 1 framing esf Specifies the T1 framing format. The default framing format is Extended Super Frame (ESF). Super Frame (SF) format offers the hdlc-idle option, which can be set to use either 0x7E or 0xFF as the HDLC idle pattern. Note    When you select SF framing, consider using the no t1-line-number yellow detection command to turn off yellow alarm detection, because the yellow alarm can be incorrectly detected with SF framing.   Step 3  vtg vtg-number t1 t1-line-number clock source {internal | line} Example: Router(config-crtlr-sts1)# vtg 1 t1 1 clock source line Sets the internal or line (network) clock source. The value of n depends on the mode of operation selected: In ct3 mode, n = 28; in vt-15 mode, n = 4. Defines the clock source for the T1 line. The default clock source is internal. Defines the clock source for the T1 line. The default clock source is internal.

Detailed Steps

Configuring a T1 in SONET CT3 Mode

The CT3 mode is the default mode for STS-1 with SONET framing

Summary Steps

1. t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}]

2. t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]}

3. t1 t 1-line-number clock source {internal | line}

Detailed Steps

Command  Purpose  Step 1  t1 t1-line-number channel-group channel-group-number timeslots list-of-timeslots [speed {56 | 64}] Example: Router(config-ctrlr-sts1)# t1 1 channel-group 15 timeslots 1-5, 20-23  Configured in STS-1 configuration mode, creates a logical channel group on a T1 line. Default speed is 64 kbps. The example shows the configuring a logical channel group in ct3 mode. The first T1 line is assigned to logical channel group 15 with channelized timeslots 1 to 5, and 20 to 23. Step 2  t1 t1-line-number framing {esf | sf [hdlc-idle {0x7E | 0xFF}]} Example: Router(config-crtlr-sts1)# t1 1 framing sf Specifies the T1 framing format. Default is Extended Super Frame (ESF). Super Frame (SF) format offers the hdlc-idle option, which can be set to use either 0x7E or 0xFF as the HDLC idle pattern. Note    When you select SF framing, consider using the no t1-line-number yellow detection command to turn off yellow alarm detection, because the yellow alarm can be incorrectly detected with SF framing.   Step 3  t1 t1-line-number clock source {internal | line} Example: Router(config-crtlr-sts1)# t1 1 clock source line Sets the internal or line (network) clock source. Default is internal.

After a T1 channel group is configured, it appears to the Cisco IOS software as a serial interface; therefore, all the configuration commands for a serial interface are available, but not all commands are applicable to the T1 channel group.

All the encapsulation formats, such as PPP, HDLC, and Frame Relay are applicable to the configured T1 channel group. Be sure that you are in serial interface configuration mode when you set the encapsulation format.

All the switching types that are applicable to a serial interface are also applicable to the configured T1 channel group.

Note   When a timeslot on a tributary is disabled, an idle pattern is transmitted on that slot. The idle pattern number STS-1 configuration command changes the idle pattern globally for all the serial interfaces on all 12 STS-1 paths. Under most operating circumstances there is no need to change the default values of the idle pattern STS-1 configuration command.

Removing a Logical Channel Group from a T1 Line

You can remove a logical channel group from a T1 line (or a T1 line) with the no form of the t1 t1-line-number channel-group channel-group-number STS-1 path configuration command, using the extended command prefix that is appropriate to your channelized configuration.

To configure a T1 line, you must enter controller configuration mode and specify the line card slot and port. The following examples show a SONET controller in slot 6 and port 0.

Using the ping Command to Verify Network Connectivity

Using the ping command, you can verify that an interface port is functioning properly. The ping command sends echo request packets out to a remote device at an IP address that you specify. After sending an echo request, the system waits a specified time for the remote device to reply. Each echo reply is displayed as an exclamation point (!) on the console terminal; each request that is not returned before the specified timeout is displayed as a period (.). A series of exclamation points (!!!!!) indicates a good connection; a series of periods (.....) or the messages [timed out] or [failed] indicate a bad connection.

Following is an example of a successful ping command to a remote server with the address 10.0.0.10:

If the connection fails, verify that you have the correct IP address for the destination and that the device is active (powered on), then repeat the ping command.

Proceed to the next section, "Using T1 Interface Loopback Modes," to finish checking network connectivity.

Using T1 Interface Loopback Modes

If you have difficulty with the 1-Port CHOC-12 ISE line card configuration or installation, you can troubleshoot the problem using the t1 t1-line-number loopback [local | network {line | payload} | remote {line fdl {ansi | bellcore} | payload [fdl] [ansi]}] path configuration command, using the extended command prefix that is appropriate to your channelized configuration. In vt-15 mode, t1-line-number is a number in the range from 1 to 4; in ct3 mode, t1-line-number is a number in the range from 1 to 28. Table 2 describes the supported loopback modes within the syntax of this command.

Note   fdl loopback commands are available only for T1 links configured for ESF framing.

Table 2 provides explanations of specific T1 loopback modes.

The following examples show how to specify loopbacks for a T1 line in vt-15 mode: