rip network 0.0.0.0












Hi guys,

 

This post is purely out of interest sake as I came across something
interesting tonight. Usually if I want to get a routing protocol up and running
quickly I will enable the protocol on all interfaces with the ‘network
0.0.0.0 0.0.0.0 command’ under the routing process.

 

I found that when doing this with RIP on my switches (3560
and 3550) they are able to receive RIP routes just fine but do not advertise
any networks! show ip protocols shows that the routing process is
enabled for the correct interfaces. See below.

 

ip routing

!

router rip

 version 2

 network 0.0.0.0

 no auto-summary

!

!

SW1(config-router)#do sh ip protocols

*** IP Routing is NSF aware ***

 

Routing Protocol is "rip"

  Sending updates every 30 seconds, next due in 15
seconds

  Invalid after 180 seconds, hold down 180, flushed after
240

  Outgoing update filter list for all interfaces is not
set

  Incoming update filter list for all interfaces is not
set

  Redistributing: rip

  Default version control: send version 2, receive
version 2

    Interface                 Send  Recv  Triggered RIP 
Key-chain

    Vlan7                     2     2

    Vlan67                    2     2

    Vlan79                    2     2

    FastEthernet0/3           2     2

    Loopback0                 2     2

  Automatic network summarization is not in effect

  Maximum path: 4

  Routing for Networks:

    0.0.0.0

  Routing Information Sources:

    Gateway         Distance      Last Update

    155.1.37.3           120      00:00:04

    155.1.67.6           120      00:00:07

  Distance: (default is 120)

 

 

 

I have found that when specifying the correct networks
advertising works properly but not when you specify all networks with 0.0.0.0
no dice.

 

Anyone have any thoughts on the matter?

 

Cheers,

 

-Aaron

 

 





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