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Cisco Bug: CSCte83622 - 'RIP Router' process is stuck in a loop sending continuous updates

Last Modified

Feb 20, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Symptoms: High CPU utilization is seen on Cisco IOS Release 12.0(33)S5 code 
 due to "RIP Send" and "BGP Scanner".
 Conditions: RIP in Cisco IOS Release 12.0(33)S does not have a separate 
 database about the routes. When RIP has to send update packets, it will scan 
 the whole routing table, validate each prefix and create the update packets 
 and send out. Above event will have to happen every 15 seconds as per the 
 timers configuration. 
 With a network where there are 150k routes learned by BGP, it is quite 
 possible the routing table scan during update generation can be CPU 
 We will see the problem of continuous rip updates and high CPU until an RIP 
 Send process. 
 Please note that a Supernet prefix needs to be installed in the RIB, and RIP 
has to include them in its updates. If it is originated by static or other 
routing protocols, we will see the symptom if they are redistributed into RIP.
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