Cisco Bug: CSCuo08297 - PBR work abnormal with a summary route include set ip next-hop address
May 08, 2020
- Cisco Catalyst 6000 Series Switches
Known Affected Releases
Symptom: 1. In 150-1.SY2 IOS image customer configure PBR, the topology as following, both switch B and switch C have route to switch D, on switch A configure PBR through switch C to switch D, and switch C have a route through switch B to switch D network if not match. Normally source to destination(switch D) through switch A and match PBR through switch C to switch D. On switch A shut down the connection interface between switch C, find the traffic been drop, and find there's a summary null 0 route include the set next hop ip address. When remove the null0 route work well. And upgrade IOS image to 151-1.SY3, with null 0 route, the match traffic will loose half packets. Source ------- switchA------------switchB-------| | | | | switchC------------------------------switchD 2. In IOS image 151-1.SY3 or 150-1.SY6 with null0 route shut down interface packet will be punt for software processing. There is 50% traffic loss. Debug ip policy shows that one packet will be policy routed, which is dropped and the other will be normal route forwarded with success. Conditions: With a null0 route include set next-hop address; Or a summary route include next-hop address point to a up interface.
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