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show interface loopback

Displays information about the IP loopback interface.

Syntax: show interface loopback number

Description: The loopback interface enables you to disconnect the operation of routing protocols from network hardware operation and thereby improve the reliability of IP connections. A loopback interface is always reachable.

The IP address assigned to the loopback interface is used as the router ID.

Use the show interface loopback 0 command with to display the IP loopback interface.

Factory Default: None.

Command Mode: Executive and privileged.

Example: In the following example, show interface loopback 0 command displays information about the IP loopback interface:

router#show interface loopback 0

Loopback 0 is up, line protocol is up

Internet address is 192.8.1.1 255.255.255.0

MTU 32768 bytes, BW 0 Mbit/Sec

Encapsulation None, CRC-00

Received:

0 bytes

0 directed packets, 0 multicast packets, 0 broadcast packets

0 discards, 0 errors, 0 unknown protocols

Transmitted:

0 bytes

0 directed packets, 0 multicast packets, 0 broadcast packets

0 discards, 0 errors

The following table describes the fields in the display:

Table 4-10. Fields Displayed by show interface loopback 
Field Description

Up/down

Operational status of the interface.

Internet address

Internet address and netmask of the loopback interface.

MTU

Maximum transfer unit size for this interface.

BW

Bandwidth of the interface in Mbit/sec.

Encapsulation

The encapsulation protocol on this interface.

CRC

The number of bits in the frame check sequence (CRC).

Received:

  • bytes

The total number of packets received over this interface.
  • directed packets

The number of unicast packets received on this interface.
  • multicast packets

The number of multicast packets received on this interface.
  • broadcast packets

The number of broadcast packets received on this interface.
  • discards

The number of received packets purposely dropped during reception on this interface.
  • errors

The number of errored packets received on this interface.
  • unknown protocols

The number of packets received with an unknown protocol.

Transmitted:

  • bytes

The total number of bytes sent over member links of this interface.
  • directed packets

The number of unicast packets sent on this interface.
  • multicast packets

The number of multicast packets sent on this interface.
  • broadcast packets

The number of broadcast packets sent on this interface.
  • discards

The number of packets purposely dropped during transmission on this interface.
  • errors

The number of packets sent in error on this interface.

Related Commands: interface
show interface ethernet
show interface pos
loopback

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Copyright © 2005 Avici Systems Inc.
Avici® and TSR® is a registered trademark of Avici Systems Inc.
IPriori™, Composite Links™, SSR™, QSR, and NSR® are trademarks of Avici Systems Inc.

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    Last Updated: 02/25/05 at 14:28:34

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