Solved: How to monitor interface administratively/operational down

ly633 · ‎04-07-2008

I think maybe a trap will be sent when interface is administratively or operational down, but which and how to config. Gurus, any direction?

Joe Clarke · ‎04-07-2008

A linkDown trap will be sent when an interface transitions from up to another state, and a linkUp trap will be sent when the interface transitions back to up.

See http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd301.html#wp1001347 on how to configure an IOS device for traps. For example:

snmp-server enable traps

snmp-server host 1.1.1.1 traps version 1 public

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Joe Clarke · ‎04-07-2008

A linkDown trap will be sent when an interface transitions from up to another state, and a linkUp trap will be sent when the interface transitions back to up.

See http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd301.html#wp1001347 on how to configure an IOS device for traps. For example:

snmp-server enable traps

snmp-server host 1.1.1.1 traps version 1 public

ly633 · ‎04-07-2008

Hi Clarke

I wonder the status you mentioned is operational status , how about administratively status?

Joe Clarke · ‎04-07-2008

Simply setting an interface to admin status up may not generate a trap if the interface does not become operationally up. However, if you set an interface which is up/up to admin down, then you will get a linkDown trap.

ly633 · ‎04-08-2008

Any syslog will send for admin shutdown?

Joe Clarke · ‎04-08-2008

Yes. If you perform a shutdown on an interface, you'll get a %LINK-5-CHANGED syslog message by default.