Guest

Preview Tool

Cisco Bug: CSCtc68613 - MSTP:Flush optimizations required for Network convergence scenarios

Last Modified

Jan 29, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

3.9.1.BASE

Description (partial)

Symptom:

Under some circumstances, MSTP on IOS-XR can perform MAC flushes when not strictly required.  This means that in some network topologies there can be more flooding than is strictly required.  If links are oversubscribed, this may lead to some traffic loss until MAC addresses are re-learned.

Conditions:

MSTP on IOS-XR follows the behavior defined in the IEEE 802.1Q-2005, and as such will perform a MAC flush for all MSTIs whenever a port moves to Forwarding state, even if some MSTIs are not actually affected by the topology change.
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.