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Yes POAP a new switch is basically greenfield a switch. When you poap a new switch you can provide more configuration when switch is poap'd in. If not it will get fab params applied. However then you will have to apply vrfs and networks and cfg user ...
No this is not possible since the new switch has different port count, and HW features. Basically you need to add the diff model as a new switch and delete the old one. (green field the new switch) Basically the fabric parameters will automatically c...
After you first config you could have done a >sh ip mbgp sum and you would have seen no cap for mbgp since it was cfg as address family on one side and not the other...
What they are saying in Cisco doc is ttl will be decremented if you cross the peer link. Lets say we have VPC setup with Sw0 and Sw1. If a packet is sent to the mac of sw0 and rvcd on sw1 (due to PC hash) it will be forwarded over the peer-link to sw...