Symptom
A Cisco ASR 1000 Series Aggregation Services router with hundreds of IPv4 and IPv6 BGP neighbors shows high CPU utilization in the BGP-related processes for several hours (more than 2.5).
Conditions
The symptom is observed with Cisco IOS Release 12.2(33)XNF. The BGP task process uses the most CPU; also, the number of routemap-cache entries should be very high.
Router# show ip bgp sum
BGP router identifier 10.0.0.1, local AS number 65000
BGP table version is 1228001, main routing table version 1228001 604000 network entries using 106304000 bytes of memory
604000 path entries using 31408000 bytes of memory
762/382 BGP path/bestpath attribute entries using 94488 bytes of memory
381 BGP AS-PATH entries using 9144 bytes of memory
382 BGP community entries using 9168 bytes of memory
142685 BGP route-map cache entries using 4565920 bytes of memory
Workaround
Use "no bgp route-map-cache." This will not cache the route-map cache results, and the issue will not be observed.
Further Problem Description
