I'm setting up three VSS system with OSPF as IGP and MPLS ontop.
In normal operation the setup work as expected with VRF's, traffic is going between test PC's.
But when I try to do a VSS failover, power off on the active switch, I get about 30sec of downtime in the VRF.
First I was thinking of OSPF, that's because I use SVI for L3 interface and not a L3 MEC. In the 'Quick Reference to Best Practices guide for IOS on 6500 it refers to that as a configuration that can cause extra downtime. (Hello/Dead timer)
But trying this out, using OSPF instead of MPLS in testing betweent the end systems, there is minimal impact in a VSS failover. Maybe about a second downtime.
Anyone have experience with MPLS and VSS? Ideas?
Im using nsf and tried mpls ldp graceful-restart and bgp graceful-restart.