Hello, We’re running ROS 6.6 and 6.7 on a number of routerboards. CCR’s, 2011’s..etc. And they all have a strange issue from time to time.
Consider the following triangle scenario.
Three Routers.
Router 1 and 2 connect.
Router 2 and 3 connect.
And Finally Router 1 and 3 connect to form a ring or triangle type topology.
Under normal routing, Each router reaches the far peer via it’s direct connection. But lets say you lose access between Router 1 and Router 2. Router 1 and router 2 can still communicate via the higher cost (and only remaining) path, Which is Router 1>Router3>Router2.
So that’s all well and good, And we have MPLS running on this scenario.
The problem is, Let’s say the link between router 1 and 2 is severed, Or potentially bounces 2-3 times due to unknown reasons. When the link returns to service, The MPLS forwarding table still routes traffic via the R1>R3>R2 path. Or in some cases, Lists no next hop for the label.
Entering a local or remote label with the correct info, Letting it rebuild the forwarding table. Then removing my static entry and letting it rebuild again always fixes the problem.
I’ll get some screenshots next time it happens. But has anyone seen this with MPLS? Any ideas?