Troubleshooting Rip; No Rip Updates Received; Route Oscillation Occurred - 3Com S7906E Configuration Manual

P - Permanent, A - Aging, S - Suppressed, G - Garbage-collect
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# Display the RIP route 100.1.1.0/24 learned on Switch A.
<SwitchA> display ip routing-table 100.1.1.0 24 verbose
Routing Table : Public
Summary Count : 1
Destination: 100.1.1.0/24
Protocol: RIP
Preference: 100
NextHop: 192.168.3.2
BkNextHop: 0.0.0.0
RelyNextHop: 0.0.0.0
Tunnel ID: 0x0
State: Active Adv
Tag: 0

Troubleshooting RIP

No RIP Updates Received

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

Route Oscillation Occurred

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 greater
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.
Process ID: 2
Cost: 2
Interface: vlan-interface 300
BkInterface:
Neighbor : 192.168.3.2
Label: NULL
Age: 00h18m40s
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