Guest

Preview Tool

Cisco Bug: CSCsz43080 - FIB not updated during SSO when SVI goes down

Last Modified

Jan 24, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(50)SG1

Description (partial)

Symptom:

A cisco catalyst 4000 blackholes traffic during SSO recovery.

Conditions:

This issue is limited to scenarios where you have a vlan that is only allowed on a trunk which is on the supervisor which used to be active and is now being removed out of the chassis or suffers a hardware failure. 
If a route exists in the routing table and cef table before SSO starts which points out of this vlan interface which will go down during SSO due to only being allowed on the trunk port which is now gone, this vlan interface will stay in the CEF table even after the router declares the vlan interface to be down. This means that during the time in between SSO starting and the routing protocols reconverging, traffic will be blackholed.
Bug details contain sensitive information and therefore require a Cisco.com 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.