Debug ip rip

debug ip rip [events]

This debug command displays information about RIP routing transactions. You may specify the events optional keyword if you are only interested in seeing RIP protocol events. Example 5-9 shows updates being received (RIP version 1) from a router with source address 131.1.18.14. The router being debugged also sent updates, in both cases to broadcast address 255.255.255.255 as the destination. Note that if an interface's broadcast address is modified, then information such as distance vector routing updates (including RIP) will no longer be sent to the default broadcast address. This could prevent routing updates from reaching the intended router.

NOTE Before multicasting became popular and well accepted, some individuals used to change the broadcast address of an IP device (e.g., router's interface) so that even though this device was generating a broadcast, the information (e.g., RIP routing update) was actually sent to a specific unicast address. Hence, it is entirely possible that you'll encounter a router that (intentionally) has a unicast address instead of 255.255.255.255 configured as the broadcast address on one of its interfaces.

The first few lines of the output in Example 5-9 (sending general request...) appear at startup or when an event occurs such as an interface transitioning or a user manually clearing the routing table (the latter is obviously the case here). This command is clearly a useful one as you troubleshoot RIP routing issues.

Example 5-9 debug ip rip Command Output

A_BackR#debug ip rip

RIP protocol debugging is on

A_BackR#clear ip route *

A_BackR#

sending general request on Ethernet0 to 255.255.255.255 sending general request on Ethernet0 to 224.0.0.9 sending general request on Ethernet1 to 255.255.255.255 sending general request on Ethernet1 to 224.0.0.9 received v1 update from 131.1.18.14 on Ethernet0 131.1.12.0 in 1 hops received v1 update from 131.1.18.14 on Ethernet0 131.1.12.0 in 1 hops sending v1 update to 255.255.255.255 via Ethernet0 (131.1.18.1) network 144.251.0.0, metric 1

sending v1 update to 255.255.255.255 via Ethernet1 network 131.1.0.0, metric 1

1w0d:

RIP

1w0d:

RIP

1w0d:

RIP

1w0d:

RIP

1w0d:

RIP

1w0d:

1w0d:

RIP

1w0d:

1w0d:

RIP

1w0d:

1w0d:

RIP

1w0d:

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