Table Of Contents
Global Interface Commands on Cisco IOS XR Software
bandwidth (global)
clear interface
dampening
interface (global)
mtu
show im dampening
show interfaces
shutdown (global)
Global Interface Commands on Cisco IOS XR Software
This module describes the global interface commands that apply to all interface types. This command set lets you configure, monitor, and troubleshoot the interfaces.
bandwidth (global)
To configure the bandwidth of an interface, use the bandwidth command in interface configuration mode.
bandwidth rate
Syntax Description
rate
|
Amount of bandwidth to be allocated on the interface, in Kilobits per second (kbps). Range is from 0 through 4294967295.
|
Defaults
The default bandwidth depends on the interface type.
Command Modes
Interface configuration
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
Note 
To obtain the default bandwidth for a specific interface, use the show interfaces command after you first bring up the interface. The default interface bandwidth is displayed in the show interfaces command output.
Task ID
Task ID
|
Operations
|
interface
|
execute
|
basic-services
|
read, write
|
Examples
The following example shows how to configure the bandwidth on a Gigabit Ethernet interface:
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router# interface GigabitEthernet 0/4/1/0
RP/0/RP0/CPU0:router# bandwidth 4000000
Related Commands
Command
|
Description
|
interface (global)
|
Configures an interface.
|
show interfaces
|
Displays statistics for all interfaces configured on the router or on a specific node.
|
clear interface
To clear interface statistics or packet counters, use the clear interface command in EXEC mode.
clear interface type instance
Syntax Description
type
|
Interface type. For more information, use the question mark (?) online help function.
|
instance
|
Either a physical interface instance or a virtual interface instance:
•Physical interface instance. The naming notation is rack/slot/module/port, and a slash between values is required as part of the notation.
–rack—Chassis number of the rack.
–slot—Physical slot number of the line card or modular services card.
–module—Module number. A physical layer interface module (PLIM) is always 0.
–port—Physical port number of the interface.
Note In references to a Management Ethernet interface located on a route processor (RP) card, the physical slot number is alphanumeric (RP0 or RP1) and the module is CPU0.
Example: interface MgmtEth0/RP1/CPU0/0.
•Virtual interface instance. Number range varies depending on interface type.
For more information about the syntax for the router, use the question mark (?) online help function.
|
Defaults
No default behavior or values
Command Modes
EXEC
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
Task ID
Task ID
|
Operations
|
interface
|
execute
|
basic-services
|
read, write
|
Examples
The following example shows how to use the clear interface command to clear the loopback interface 2:
RP/0/RP0/CPU0:router# clear interface loopback 2
Related Commands
Command
|
Description
|
interface (global)
|
Configures an interface.
|
show interfaces
|
Displays statistics for all interfaces configured on the router or on a specific node.
|
dampening
To limit propagation of transient or frequently changing interface states on Interface Manager (IM) clients, turn on event dampening by using the dampening command in interface configuration mode. To turn dampening off, use the no form of this command.
dampening [half-life [reuse suppress max-suppress-time]]
no dampening [half-life [reuse suppress max-suppress-time]]
Syntax Description
half-life
|
(Optional) Time (in minutes) after which a penalty is decreased. Once the interface has been assigned a penalty, the penalty is decreased by half after the half-life period. The process of reducing the penalty happens every 5 seconds. The range of the half-life period is 1 to 45 minutes. The default is 1 minute.
|
reuse
|
(Optional) Penalty value below which a stable interface is unsuppressed. Range is from 1 through 20000. Default value is 750.
|
suppress
|
(Optional) Limit at which an interface is suppressed when its penalty exceeds that limit. Range is from 1 through 20000, and must be greater than the reuse threshold. The default value is 2000.
|
max-suppress-time
|
(Optional) Maximum time (in minutes) that an interface can be suppressed. This value effectively acts as a ceiling that the penalty value cannot exceed. Default value is four times the half-life period.
|
Defaults
Dampening is turned off by default. When you use the dampening command, the following default values are enabled for any optional parameters that you do not enter:
•half-life: 1 minute
•reuse: 750
•suppress: 2000
•max-suppress-time: Four times the half-life
Command Modes
Interface configuration
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
Event dampening suppresses a constantly unstable interface until it remains stable for a period of time. Enabling dampening on an interface that already has dampening configured has the effect of resetting the penalty associated with that interface to zero. The reuse threshold must always be less than the suppress threshold.
Consider the following guidelines when configuring event dampening:
•Configuring dampening on both a subinterface and its parent is usually unnecessary because their states are almost always the same and dampening would be triggered at the same time on each interface.
•If all subinterfaces require dampening, then apply dampening to the main interface only. Applying configuration to large numbers of subinterfaces requires an abundance of memory and increases the time required to process the configuration during boot and failover.
•When dampening is enabled, an interface has a penalty value associated with it. The value starts at 0 and is increased by 1000 whenever the underlying state of the interface changes from up to down.
•The penalty value decreases exponentially while the interface state is stable. If the penalty value exceeds a configured suppress threshold, then the state of the interface is suppressed and IM will not notify upper layers of further state transitions. The suppressed state remains until the penalty value decreases past a configured reuse threshold.
Task ID
Task ID
|
Operations
|
interface
|
read, write
|
Examples
The following example shows how to enable dampening with default values on an interface:
RP/0/RP0/CPU0:router(config)# interface POS 0/4/0/0
RP/0/RP0/CPU0:router(config-if))# dampening
Related Commands
Command
|
Description
|
show im dampening
|
Displays the state of all interfaces (or caps nodes) on which dampening has been configured.
|
interface (global)
To configure an interface or to create or configure a virtual interface, use the interface command in global configuration mode. To delete the interface configuration, use the no form of this command.
interface type instance
no interface type instance
Syntax Description
type
|
Interface type. For more information, use the question mark (?) online help function.
|
instance
|
Either a physical interface instance or a virtual interface instance:
•Physical interface instance. The naming notation is rack/slot/module/port, and a slash between values is required as part of the notation.
–rack—Chassis number of the rack.
–slot—Physical slot number of the line card or modular services card.
–module—Module number. A physical layer interface module (PLIM) is always 0.
–port—Physical port number of the interface.
Note In references to a Management Ethernet interface located on a route processor card, the physical slot number is alphanumeric (RP0 or RP1) and the module is CPU0.
Example: interface MgmtEth0/RP1/CPU0/0.
•Virtual interface instance. Number range varies depending on interface type.
For more information about the syntax for the router, use the question mark (?) online help function.
|
Defaults
No interfaces are configured
Command Modes
Global configuration
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
The interface command enters interface configuration mode to allow you to configure interfaces. If a virtual interface is configured, then the interface is created if it did not already exist.
The no form of this command applies only to virtual interfaces or to subinterfaces (that is, interfaces that have been created in global configuration mode).
Task ID
Task ID
|
Operations
|
interface
|
read, write
|
Examples
In the following example, the interface command is given for the POS card in location 0/2/0/1, and interface configuration mode is entered for that interface:
RP/0/RP0/CPU0:router(config)# interface POS 0/2/0/1
Related Commands
Command
|
Description
|
clear interface
|
Clears interface statistics or packet counters.
|
show interfaces
|
Displays statistics for all interfaces configured on the router or on a specific node.
|
mtu
To adjust the maximum transmission unit (MTU) value for packets on the interface, use the mtu command in interface configuration mode. To return the interface to the default MTU for the interface type, use the no form of this command.
mtu bytes
no mtu
Syntax Description
bytes
|
Maximum number of bytes in a Layer 2 frame. Range is from 64 through 65535.
|
Defaults
The default MTU for each interface is as follows:
•Ethernet—1514 bytes
•POS—4474 bytes
•Tunnel—1500 bytes
•Loopback—1514 bytes
Command Modes
Interface configuration
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
Use the mtu command to set a specific MTU value for an interface, or use the no mtu command to return the interface to the default MTU value for that interface type. The MTU value can be increased or decreased using the mtu command, subject to minimum and maximum MTU limits for the interface type.
If the MTU value is not configured, then each interface will have a default MTU value that is specific to the interface type. The default MTU value is generally the largest Layer 2 frame size possible for the interface type.
You can use the show interfaces command to determine if the MTU value has been changed. The show interfaces command output displays the MTU size for each interface in the MTU (byte) field. Note that the MTU size that is displayed includes the Layer 2 header bytes used for each encapsulation type.
Note Changing the MTU on an interface triggers a change on the protocols and capsulations configured on that interface, although some protocol-specific configurations can override the interface MTU. For example, specifically changing the interface MTU configuration does not affect the IP MTU configuration, but may affect the resulting MTU on that node.
Task ID
Task ID
|
Operations
|
interface
|
read, write
|
Examples
In the following example, the MTU value for all interfaces is verified. The MTU value is shown in the next-to-last column:
RP/0/RP0/CPU0:router# show interfaces all brief
Intf Intf LineP Encap MTU BW
Name State State Type (byte) (Kbps)
--------------------------------------------------------------------------------
Nu0 up up Null 1500 Unknown
PO6/0/0/0 up up HDLC 4474 2488320
PO6/0/0/1 up up HDLC 4474 2488320
PO6/0/0/2 admin-down admin-down HDLC 4474 2488320
PO6/0/0/3 admin-down admin-down HDLC 4474 2488320
Mg0/RP0/CPU0/0 up up ARPA 1514 100000
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# interface POS 6/0/0/0
RP/0/RP0/CPU0:router(config-if)# mtu 1000
After the mtu command is used to decrease the MTU Layer 2 frame size for the POS interface on 6/0/0/0 to 1000 bytes, the show interfaces all brief command is used again to verify that the MTU Layer 2 frame size has been changed:
RP/0/RP0/CPU0:router# show interfaces all brief
Intf Intf LineP Encap MTU BW
Name State State Type (byte) (Kbps)
--------------------------------------------------------------------------------
Nu0 up up Null 1500 Unknown
PO6/0/0/0 up up HDLC 1000 2488320
PO6/0/0/1 up up HDLC 4474 2488320
PO6/0/0/2 admin-down admin-down HDLC 4474 2488320
PO6/0/0/3 admin-down admin-down HDLC 4474 2488320
Mg0/RP0/CPU0/0 up up ARPA 1514 100000
Related Commands
Command
|
Description
|
show interfaces
|
Displays statistics for all interfaces configured on the router or on a specific node.
|
show im dampening
To display the state of all interfaces on which dampening has been configured, use the show im dampening command in EXEC mode.
show im dampening [interface type | ifhandle handle]
Syntax Description
interface type
|
(Optional) Interface type. For more information, use the question mark (?) online help function.
|
ifhandle handle
|
(Optional) Identifies the caps node whose Interface Manager (IM) dampening information you want to display.
|
Defaults
If you do not specify an interface, then the system displays brief details about all dampened interfaces.
Command Modes
EXEC
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
If you do not specify an interface, then the system displays brief details about all dampened interfaces.
Task ID
Task ID
|
Operations
|
interface
|
read
|
Examples
The following is sample output from the show im dampening command issued with default values:
RP/0/RP0/CPU0:router(config)# interface POS 0/4/0/3
RP/0/RP0/CPU0:router(config-if)# no shutdown
RP/0/RP0/CPU0:router(config-if)# dampening
RP/0/RP0/CPU0:router# show im dampening
Interface Proto Caps Penalty
--------- ----- ---- ----------------
RP/0/RP0/CPU0:router# show im dampening interface POS 0/4/0/3
Dampening enabled: penalty 0, not suppressed
suppress: 3000 max-suppress-time: 4
RP/0/RP0/CPU0:router# show interfaces POS 0/4/0/3
POS0/4/0/3 is up, line protocol is down
Dampening enabled: penalty 0, not suppressed
suppress: 3000 max-suppress-time: 4
Hardware is Packet-over-SONET
Description: ensoft-gsr5 POS 4\2
Internet address is Unknown
MTU 4474 bytes, BW 155520 Kbit
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, controller loopback not set, keepalive set (10 sec)
Last clearing of "show interface" counters never
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
48 packets output, 1504 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
Table 25 describes the significant fields shown in the display.
Table 25 show im dampening Field Descriptions
Field
|
Description
|
Dampening
|
Indicates the dampening state and penalty value: not suppressed, suppressed.
|
underlying state
|
Underlying state of the interface: up, down, administratively down (if an interface has been configured to be "shutdown").
|
half_life
|
Time (in minutes) after which a penalty is decreased.
|
reuse
|
Penalty value below which a stable interface is unsuppressed.
|
suppress
|
Limit at which an unstable interface is suppressed when the penalty value exceeds the suppress value.
|
max-suppress-time
|
Maximum time (in minutes) that an interface can be suppressed.
|
Related Commands
Command
|
Description
|
dampening
|
Limits propagation of transient or frequently changing interface states on IM clients.
|
show interfaces
|
Displays statistics for all interfaces configured on the router or on a specific node.
|
show interfaces
To display statistics for all interfaces configured on the router or for a specific node, use the show interfaces command in EXEC mode.
show interfaces [type instance | all | local | location node-id] [accounting | brief | detail |
summary]
Syntax Description
type
|
(Optional) Specifies the type of interface for which you want to display statistics. For more information, use the question mark (?) online help function.
|
instance
|
Specifies the number of the interface whose statistics you want to display. You can display statistics for a physical interface or a virtual interface:
•Physical interface instance. The naming notation is rack/slot/module/port, and a slash between values is required as part of the notation.
–rack—Chassis number of the rack.
–slot—Physical slot number of the line card or modular services card.
–module—Module number. A physical layer interface module (PLIM) is always 0.
–port—Physical port number of the interface.
Note In references to a Management Ethernet interface located on a route processor card, the physical slot number is alphanumeric (RP0 or RP1) and the module is CPU0.
Example: interface MgmtEth0/RP1/CPU0/0.
•Virtual interface instance. Number range varies depending on interface type.
For more information about the syntax for the router, use the question mark (?) online help function.
|
all
|
(Optional) Displays interface information for all interfaces.This is the default.
|
local
|
(Optional) Displays interface information for all interfaces in the local card.
|
location node-id
|
(Optional) Displays information about all interfaces on the specified node. The node-id argument is entered in the rack/slot/module notation.
|
accounting
|
(Optional) Displays the number of packets of each protocol type that have been sent through the interface.
|
brief
|
(Optional) Displays brief information about each interface (one line per interface).
|
detail
|
(Optional) Displays detailed information about each interface. This is the default.
|
summary
|
(Optional) Displays a summary of interface information by interface type.
|
Defaults
No default behavior or values
Command Modes
EXEC
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
The show interfaces command field description table was updated with enhanced definitions for 5 minute output rate and 5 minute output rate.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
The show interfaces command displays statistics for the network interfaces. The resulting display shows the interface processors in slot order.
For example, if you type the show interfaces command without an interface type, you receive information for all the interfaces installed in the networking device. Only by specifying the interface type, slot, and port arguments can you display information for a particular interface.
If you enter a show interfaces command for an interface type that has been removed from the networking device, an error message is displayed: "Interface not found."
The output displayed depends on the network for which an interface has been configured.
Note The 5-minute input and output rates should be used only as an approximation of traffic per second during a given 5-minute period. These rates are exponentially weighted averages with a time constant of 5 minutes. A period of four time constants must pass before the average will be within 2 percent of the instantaneous rate of a uniform stream of traffic over that period.
Task ID
Task ID
|
Operations
|
interface
|
read
|
Examples
The following is sample output from the show interfaces command. The output displayed depends on the type and number of interface cards in the networking device.
RP/0/RP0/CPU0:router# show interfaces tenGigE 0/0/0/1
TenGigE0/0/0/1 is administratively down, line protocol is administratively down
Hardware is TenGigE, address is 0800.4539.d909 (bia 0800.4539.d909)
Description: user defined string
Internet address is Unknown
MTU 1514 bytes, BW 10000000 Kbit
reliability 255/255, txload 0/255, rxload 0/255
Full-duplex, 10000Mb/s, LR
output flow control is off, input flow control is off
ARP type ARPA, ARP timeout 01:00:00
Last clearing of "show interface" counters never
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
In the following sample output, instance 1 is specified on a Packet-over-SONET/SDH (POS) card:
RP/0/RP0/CPU0:router# show interfaces POS 0/1/0/1
POS0/1/0/1 is administratively down, line protocol is administratively down
Hardware is Packet over SONET
Internet address is n.n.n.n/n
MTU 4474 bytes, BW 9953280 Kbit
reliability 255/255, txload 0/255, rxload 0/255
Encapsulation HDLC, crc 32, controller loopback not set, keepalive not set
Last clearing of "show interface" counters never
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 total input drops
0 drops for unrecognized upper-level protocol
Received 0 broadcast packets, 0 multicast packets
0 runts, 0 giants, 0 throttles, 0 parity
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 total output drops
Output 0 broadcast packets, 0 multicast packets
0 output errors, 0 underruns, 0 applique, 0 resets
0 output buffer failures, 0 output buffers swapped out
Table 26 describes the significant fields shown in the display.
Table 26 show interfaces Field Descriptions
Field
|
Description
|
Interface name
|
Displays the name of the current interface. In the example, the interface name is POS0/1/0/1.
|
Interface state
|
Displays the state of the interface. In the example, the interface is in the administratively down state.
|
line protocol state
|
Displays the state of the Layer 2 line protocol. This field may be different from the interface state if, for example, a keepalive failure has brought down the Layer 2.
Note The line protocol state is not the same as the protocol state displayed in the show ip interfaces command, because it is the state of Layer 2 (media) rather than Layer 3 (IP protocol).
|
Hardware
|
Displays the current hardware type.
|
Internet address is n.n.n.n/n
|
Displays the Layer 2 address (MAC address for Ethernet interfaces).
Note Enter the mac-address command to configure the hardware address.
|
bia
|
Displays the burned-in address (BIA) for the interface. The BIA is the default L2 (MAC) address for the interface.
Note The BIA is not configurable.
|
description
|
Displays the user-defined string that is associated with the interface.
Note Enter the description command to configure the description associated with the interface.
|
Internet Address
|
Displays the Layer 3 (IP) address for the interface.
Note Enter the ipv4 address command to configure the internet address for the interface.
|
MTU
|
Displays the maximum transmission unit (MTU) for the interface. The MTU is the maximum packet size that can be transmitted over the interface.
Note The MTU field indicates the interface MTU. Enter the mtu command to configure a lower MTU value at the Layer 3 level.
|
BW
|
Displays the bandwidth of the interface in kbps.
|
reliability
|
Displays the proportion of packets that are not dropped and do not have errors.
Note The reliability is shown as a fraction of 255.
|
txload
|
Indicates the traffic flowing out of the interface as a proportion of the bandwidth.
Note The txload is shown as a fraction of 255.
|
rxload
|
Indicates the traffic flowing into the interface as a proportion of the bandwidth.
Note The rxload is shown as a fraction of 255.
|
Encapsulation
|
Layer 2 encapsulation installed on the interface.
|
CRC
|
Indicates the length of the cyclic redundancy check (CRC), in bytes.
Note The CRC is not present for all interface types.
Note Enter the pos crc command to configure the CRC.
|
loopback or controller loopback
|
Indicates whether the hardware has been configured to be looped back.
Note Enter the loopback command to configure the loopback or controller loopback.
|
keepalive
|
Displays the configured keepalive value, in seconds.
Note Enter the keepalive command to configure the value of the keepalive field.
Note The keepalive field may not be present if it is not applicable to the interface type.
|
Duplexity
|
Displays the duplexity of the link.
Note This field is present only for shared media.
Note For some interface types, you can configure the duplexity by entering the full-duplex and half-duplex commands.
|
Speed
|
Speed and bandwidth of the link in Mbps. This field is present only when other parts of the media info line are also displayed (see duplexity and media type).
|
Media Type
|
Media type of the interface.
|
output flow control
|
Whether output flow control is enabled on the interface.
|
input flow control
|
See output flow control.
|
ARP type
|
Address Resolution Protocol (ARP) type used on the interface. This value is not displayed on interface types that do not use ARP.
|
ARP timeout
|
ARP timeout in hours:mins:secs. This value is configurable using the arp timeout command.
|
Last clearing of counters
|
Time since the following counters were last cleared using the clear counters exec command in hours:mins:secs.
|
5 minute input rate
|
Average number of bits and packets received per second in the last 5 minutes. If the interface is not in promiscuous mode, it senses network traffic that it sends and receives (rather than all network traffic).
Note The 5-minute period referenced in the command output is a load interval that is configurable under the interface. The default value is 5 minutes.
Note The five-minute input should be used only as an approximation of traffic per second during a given five-minute period. This rate is exponentially weighted average with a time constant of five minutes. A period of four time constants must pass before the average will be within two percent of the instantaneous rate of a uniform stream of traffic over that period.
|
5 minute output rate
|
Average number of bits and packets transmitted per second in the last 5 minutes. If the interface is not in promiscuous mode, it senses network traffic that it sends and receives (rather than all network traffic).
Note The 5-minute period referenced in the command output is a load interval that is configurable under the interface. The default value is 5 minutes.
Note The five-minute output should be used only as an approximation of traffic per second during a given five-minute period. This rate is exponentially weighted average with a time constant of five minutes. A period of four time constants must pass before the average will be within two percent of the instantaneous rate of a uniform stream of traffic over that period.
|
packets input
|
Number of packets received on the interface that were successfully delivered to higher layers.
|
bytes input
|
Total number of bytes successfully received on the interface
|
total input drops
|
Total number of valid packets that were dropped after they were received. This includes packets that were dropped due to configured quality of service (QoS) or access control list (ACL) policies. This does not include drops due to unknown Layer 3 protocol.
|
drops for unrecognized upper-level protocol
|
Total number of packets that could not be delivered because the necessary protocol was not configured on the interface.
|
Received broadcast packets
|
Total number of Layer 2 broadcast packets received on the interface. This is a subset of the total input packet count.
|
Received multicast packets
|
Total number of Layer 2 multicast packets received on the interface. This is a subset of the total input packet count.
|
runts
|
Number of received packets that were too small to be handled. This is a subset of the input errors count.
|
giants
|
Number of received packets that were too large to be handled. This is a subset of the input errors count.
|
throttles
|
Number of packets dropped due to throttling (because the input queue was full).
|
parity
|
Number of packets dropped because the parity check failed.
|
input errors
|
Total number of received packets that contain errors and hence cannot be delivered. Compare this to total input drops, which counts packets that were not delivered despite containing no errors.
|
CRC
|
Number of packets that failed the CRC check.
|
frame
|
Number of packets with bad framing bytes.
|
overrun
|
Number of overrun errors experienced by the interface. Overruns represent the number of times that the receiver hardware is unable to send received data to a hardware buffer because the input rate exceeds the receiver's ability to handle the data.
|
ignored
|
Total number of ignored packet errors. Ignored packets are those that are discarded because the interface hardware does not have enough internal buffers. Broadcast storms and bursts of noise can result in an increased number of ignored packets.
|
abort
|
Total number of abort errors on the interface.
|
packets output
|
Number of packets received on the interface that were successfully delivered to higher layers.
|
bytes output
|
Total number of bytes successfully received on the interface.
|
total output drops
|
Number of packets that were dropped before being transmitted.
|
Received broadcast packets
|
Number of Layer 2 broadcast packets transmitted on the interface. This is a subset of the total input packet count.
|
Received multicast packets
|
Total number of Layer 2 multicast packets transmitted on the interface. This is a subset of the total input packet count.
|
output errors
|
Number of times that the receiver hardware was unable to handle received data to a hardware buffer because the input rate exceeded the receiver's ability to handle the data.
|
underruns
|
Number of underrun errors experienced by the interface. Underruns represent the number of times that the hardware is unable to transmit data to a hardware buffer because the output rate exceeds the transmitter's ability to handle the data.
|
applique
|
Number of applique errors.
|
resets
|
Number of times that the hardware has been reset. The triggers and effects of this event are hardware-specifc.
|
output buffer failures
|
Number of times that a packet was not output from the output hold queue because of a shortage of MEMD shared memory.
|
output buffers swapped out
|
Number of packets stored in main memory when the output queue is full; swapping buffers to main memory prevents packets from being dropped when output is congested. The number is high when traffic is bursty.
|
carrier transitions
|
Number of times the carrier detect (CD) signal of a serial interface has changed state.
|
Related Commands
Command
|
Description
|
show controller interface
|
Displays information that is specific to the interface hardware statistics for all interfaces configured on the networking device.
|
shutdown (global)
To disable an interface (to force an interface to be administratively down), use the shutdown command in interface configuration mode. To enable an interface that has been shut down, use the no form of this command.
shutdown
no shutdown
Syntax Description
This command has no arguments or keywords.
Defaults
The interface is enabled by default and is disabled only when shutdown is configured.
Note When you add an interface to the system, or when all the configuration for an interface is lost or deleted, the interface is put in the shutdown state by the system adding the interface.
Command Modes
Interface configuration
Command History
Release
|
Modification
|
Release 2.0
|
This command was introduced on the Cisco CRS-1.
|
Release 3.0
|
No modification.
|
Release 3.2
|
This command was first supported on the Cisco XR 12000 Series Router.
|
Release 3.3.0
|
No modification.
|
Release 3.4.0
|
No modification.
|
Release 3.5.0
|
No modification.
|
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes the proper task IDs. For detailed information about user groups and task IDs, see the Configuring AAA Services on Cisco IOS XR Software module of the Cisco IOS XR System Security Configuration Guide.
Use the shutdown command to move the state of an interface to administratively down, which stops traffic flowing through the interface. This state does not stop other action from happening on the interface such as changes in configuration, protocols, capsulations, and so forth.
The shutdown command also marks the interface as unavailable. To check whether the state of an interface is down, use the show interfaces command in EXEC mode, which displays the current state of the interface. An interface that has been shut down is shown as administratively down in the display from the show interfaces command.
Task ID
Task ID
|
Operations
|
interface
|
read, write
|
Examples
In the following example, POS interface 0/4/0/2 is turned off:
RP/0/RP0/CPU0:router(config)# interface POS 0/4/0/2
RP/0/RP0/CPU0:router(config-if)# shutdown
Related Commands
Command
|
Description
|
show interfaces
|
Displays statistics for all interfaces configured on the router or on a specific node.
|
show ip interface
|
Displays IPv4 interface status and configuration.
|
