Reset Search
 

 

Article

MVRP packets cause FDB learning on STP blocked port

« Go Back

Information

 
TitleMVRP packets cause FDB learning on STP blocked port
Symptoms
  • FDB thrashing
  • Ping or other traffic loss to switch IP interface
  • Network performance degradation
Environment
  • All EXOS Platforms
  • EXOS 15.4.1 and up
  • MVRP Enabled
Cause
MVRP packets are not blocked on a STP blocked port, causing learning on the port and FDB thrashing.  This leads to forwarding issues and traffic loss for the affected FDB entries.
Resolution
This is a software defect and can be tracked via CR xos0062494.  A software upgrade will be required to resolve.

Workaround:

1. Check the VLAN configuration to determine what VLANs are dynamically added or could possibly be added to the switch interconnects.
2. Disable MVRP on the switch interconnections and uplinks:
disable mvrp <PORT_LIST>
3. Rename dynamically created VLANs so that they can be manually configured.  Note: This will not effect MVRP operation on MVRP enabled ports.
configure vlan <DYNAMIC_VLAN> name <NEW_STATIC_VLAN>
4. Manually add any VLAN that could normally be dynamically added via MVRP to the uplink ports:
configure vlan <NEW_STATIC_VLAN> add ports <UPLINK_PORTS> tagged


 
Additional notes

Feedback

 

Was this article helpful?


   

Feedback

Please tell us how we can make this article more useful.

Characters Remaining: 255