Troubleshooting Rip Configuration; No Rip Updates Received; Route Oscillation Occurred - 3Com MSR 50 Series Configuration Manual

990 C 59: RIP C
HAPTER
Troubleshooting RIP
Configuration

No RIP Updates Received

Route Oscillation
Occurred
ONFIGURATION
[RouterB] rip 100
[RouterB-rip-100] filter-policy 2000 export rip 200
# Display the routing table on Router A.
[RouterA] display ip routing-table
Routing Tables: Public
Destinations : 7
Destination/Mask
1.1.1.0/24
1.1.1.1/32
2.1.1.0/24
2.1.1.1/32
5.1.1.0/24
127.0.0.0/8
127.0.0.1/32
Symptom:
No RIP updates are received when the links work well.
Analysis:
After enabling RIP, you must use the network command to enable corresponding
interfaces. Make sure no interfaces are disabled from handling RIP messages.
If the peer is configured to send multicast messages, the same should be
configured on the local end.
Solution:
Use the display current-configuration command to check RIP configuration
■
Use the display rip command to check whether some interface is disabled
■
Symptom:
When all links work well, route oscillation occurs on the RIP network. After
displaying the routing table, you may find some routes appear and disappear in
the routing table intermittently.
Analysis:
In the RIP network, make sure all the same timers within the whole network are
identical and relationships between timers are reasonable. For example, the
timeout timer value should be larger than the update timer value.
Solution:
Use the display rip command to check the configuration of RIP timers
■
Use the timers command to adjust timers properly.
■
Routes : 7
Proto Pre Cost
Direct 0 0
Direct 0 0
Direct 0 0
Direct 0 0
RIP 100 4
Direct 0 0
Direct 0 0
NextHop Interface
1.1.1.1 Eth1/0
127.0.0.1 InLoop0
2.1.1.1 Eth1/1
127.0.0.1 InLoop0
1.1.1.2 Eth1/0
127.0.0.1 InLoop0
127.0.0.1 InLoop0