Question of the day 1/31/09
Posted by jrensink78 on January 31, 2009
The answer to the last question of the day “By default, what versions of updates does RIP send and receive?” is that RIP sends v1 and receives v1 and v2 by default. RIP v1 is able to process RIP v2 updates by simply ignoring the v2 specific fields.
Here is the output of a “show ip protocol” command with a default RIP setup. Notice the bold part where it shows what versions are being sent and received.
Router#show ip prot
Routing Protocol is “rip”
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Sending updates every 30 seconds, next due in 8 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Redistributing: rip
Default version control: send version 1, receive any version
Interface Send Recv Triggered RIP Key-chain
FastEthernet0/0 1 1 2
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
2.0.0.0
Routing Information Sources:
Gateway Distance Last Update
2.0.0.1 120 00:00:23
Distance: (default is 120)
If you want to prevent RIP v1 from processing v2 updates, issue the “version 1″ command under the routing process. That will limit RIP to only sending and receiving v1 updates.
