Preview Tool

Cisco Bug: CSCtb71515 - stale prefixes remaining when peers flapped during route churn

Last Modified

Oct 05, 2010

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)


   when an iBGP session flaps between PE and RR, it can cause missing BGP
routes (advertisements or withdraws) on the receiving PEs, that are lagging
behind (mostly new members who got their session established recently) other
members of the update-group.

Affects releases with support for refresh update-group functionality,
introduced in 12.2(31)SB16 and later.
The problem may happen when there is enough churn in the network, and there are
new BGP sessions that are getting established at the same time.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.