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Cisco Bug: CSCuq23019 - Incorrect route choice in RIB when backup paths are present

Last Modified

Jan 07, 2017

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

4.3.3.BASE

Description (partial)

Symptom:
Rib not always selecting correct route when backup path is available.
In some scenarios, excessive route churn is seen, which causes high CPU.

Conditions:
oUsing EIGRP as PE-CE protocol
oMutual redistribution between EIGRP and BGP
oAdditional paths config in BGP VPNV4 address family
oEIGRP route be installed in the RIB before receiving IBGP route
oIBGP path should have lower metric (cost community) than CE-EIGRP path. This results in IBGP path being passed to RIB first (since it is the best path), followed by the redistributed EIGRP path.
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