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3.3 | |
Troubleshooting Routing Protocols | |
| 3.3.2 | |
Troubleshooting RIP configuration |
The most common problem found in Routing
Information Protocol (RIP) that prevents RIP routes from being
advertised is the variable-length subnet mask (VLSM). This is because
RIP Version 1 does not support VLSM. If the RIP routes are not being
advertised, check the following:
The
show ip protocols
command provides information about the parameters and current state of
the active routing protocol process. RIP sends updates to the
interfaces in the specified networks.
Use the debug ip rip EXEC command to display information on RIP routing transactions. The no debug ip rip, no debug all, or undebug all commands will turn off all debugging.
Figure
An entry most likely caused by a malformed packet from the transmitter is shown in the following output:
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If
interface FastEthernet 0/1 was configured but the network was not
added to RIP routing, no updates would be sent out or received from
the interface.
shows that
the router being debugged has received an update from another router
at source address 192.168.3.1. That router sent information about two
destinations in the routing table update. The router being debugged
also sent updates. Both routers broadcasted address 255.255.255.255 as
the destination. The number in parentheses is the source address
encapsulated into the IP header.
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