Need some advices on this issue. Yesterday we have a power maintenace activity which we shut down 2 of our core switches. When we power up these 2 swicthes, there's a problem i observed:
Out of the multiple interfaces which i created, some of them are up and running and some are remained down (Status n Protocol Down). This adnormalty is observed on our core switch 2, core switch 1 have all the interfaces up and running.
When i do a show standby bri on the SW2, those interfaces that are down are stuck in init status which is normal since the interfaces are down.
My questions here are:
1) Why are these interfaces remained down for quite a long time then it resolved by itself without doing anything?
2) What can be done to troubleshoot this issue to isolate the problem?