A VMware SD-WAN Partner Gateway running BGP may continue to advertise a VMware SD-WAN Edge's subnet after the advertise flag is set to False.
Article ID: 329096
Updated On:
Products
VMware Aria Suite
Issue/Introduction
-
This KB article documents the issue encountered under internal ticket #78568.
-
The behavior is seen with a customer using multiple Partner Gateways running BGP with Edges also using BGP, and after the BGP neighbor adjacency goes down at the Edge level.
Symptoms:
A VMware SD-WAN Partner Gateway may continue to advertise a VMware SD-WAN Edge's LAN subnet after that subnet's advertise flag is set to False. This behavior may lead to routing issues due to the undesired routing advertisement.
Environment
VMware SD-WAN
Cause
The routes continue to be advertised because when the Edge breaks the BGP neighbor adjacency, one of the connected Partner Gateways maintains the stale route of the Edge LAN subnet.
Resolution
The problem has been addressed through internal ticket ID #78568.
The fix for this issue is found on the following VMware Gateway Releases:
Workaround:
The only way to remediate the issue and clear the stale BGP routes is for a Partner or Operator to restart the Partner Gateway service in a suitable maintenance window.
A customer who does not have direct access to the Partner Gateways can contact VMware SD-WAN Support and a Technical Support Engineer will assist the customer in restarting the Partner Gateway service.
The fix for this issue is found on the following VMware Gateway Releases:
- On Release 4.3.1, the fix is included with the 4.3.1 Gateway Rollup #8: R431-20220510-GA which was released on May 17th, 2022, and all later Gateway builds in this release train.
- Upcoming Release 4.5.1 Gateway Rollup #1 (GA date TBD).
- All Release 5.0.0.0 GA builds and upcoming builds on this release train (for example, upcoming Release 5.0.1.0).
Workaround:
The only way to remediate the issue and clear the stale BGP routes is for a Partner or Operator to restart the Partner Gateway service in a suitable maintenance window.
A customer who does not have direct access to the Partner Gateways can contact VMware SD-WAN Support and a Technical Support Engineer will assist the customer in restarting the Partner Gateway service.
Additional Information
Impact/Risks:
Stale routes on a Partner Gateway negatively affect customer traffic destined to the affected BGP subnets and can lead to entire customer flows getting dropped because traffic is routed to non-existent routes.
Stale routes on a Partner Gateway negatively affect customer traffic destined to the affected BGP subnets and can lead to entire customer flows getting dropped because traffic is routed to non-existent routes.
Feedback
Yes
No
Powered by
