show ip protocols

The information displayed by show ip protocols is useful in debugging routing operations. The output indicates the parameters the particular protocol is using to send and receive updates, the metrics it is using, and the networks it is advertising. Information in the Routing Information Sources field output can help you identify a router suspected of delivering bad routing information.

show ip protocols

Sample Displays

The following is sample output from the show ip protocols command, showing IGRP processes:

Router# show ip protocols

Routing Protocol is "igrp 109"
  Sending updates every 90 seconds, next due in 44 seconds
  Invalid after 270 seconds, hold down 280, flushed after 630
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  IGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  IGRP maximum hopcount 100
  IGRP maximum metric variance 1
  Redistributing: igrp 109
  Routing for Networks:
    198.92.72.0
  Routing Information Sources:
    Gateway         Distance       Last Update
    198.92.72.18         100       0:56:41
    198.92.72.19         100       6d19
    198.92.72.22         100       0:55:41
    198.92.72.20         100       0:01:04
    198.92.72.30         100       0:01:29
  Distance: (default    is 100)
  

Breaking down the output section by section gives the following detail:

Routing Protocol is "igrp 109"

This identifies the routing protocol and process that is being displayed.

Sending updates every 90 seconds, next due in 44 seconds
Invalid after 270 seconds, hold down 280, flushed after 630
  

This section gives information about the timer settings that the router is using.

Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set

This section indicates if any access lists have been applied as filters for incoming or outgoing routing updates from this router.

Default networks flagged in outgoing updates
Default networks accepted from incoming updates
  

This portion indicates how the protocol will handle default routes.

IGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
IGRP maximum hopcount 100
IGRP maximum metric variance 1
  

In this part, the metrics that have been assigned for the protocol are displayed.

Redistributing: igrp 109

This line indicates that the routing is not only receiving updates, but also redistributing updates to other routers.

Routing for Networks:
  198.92.72.0
  

This tells what networks are being advertised as local to this router in its updates.

  Routing Information Sources:
    Gateway         Distance       Last Update
    198.92.72.18         100       0:56:41
    198.92.72.19         100       6d19
    198.92.72.22         100       0:55:41
    198.92.72.20         100       0:01:04
    198.92.72.30         100       0:01:29
  Distance: (default    is 100)
  

This section indicates the IP addresses that this router has received routing updates from for IGRP process 109. Also displayed is the distance to the listed address and the last time that an update was heard from the address.