I have had a couple of strange incidents where changing a physical interface or ip address on an interface causes routing problems. We are running ASR9010 on IOS-XR 4.2.3
Changed a physical interface gi0/0/0/1.12 to BE21.12 on a vrf.
I lost static routes and had to remove and re-apply.
Changed the IP address to a different network 172.17.254.126/27 to 172.27.254.126/27
ARP OK and ping from VRF or local device in other VRF OK, however host on connected interface cannot be pinged from across MPLS. Connected route is carried across MPLS OK. We will be trying to remove the entire interface and vrf config and re-apply.
EDIT: We re-applied config after removing and commiting. It is now working.
It's hard to say without data to illustrate the issue... but for the static route issue, this might be due to
CSCue35606 were a static route might stop working when you don't specify the interface in the static route (only the next hop) and when the local interface goes down so that you now learn that net hop from another MPLS-VPN PE which is connected to that next hop too. When the local interface comes back up and the next hop is reachable locally again, traffic matching the static route will be dropped.
There is a SMU for it so I'd recommend installing the latest SMUs for 4.2.3.
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