Some MPLS VPN notes from my CCNP study lab
Studying MPLS L3 VPN for CCNP and kept getting stuck on the same few things. Writing them down here in case it saves someone else time. Stuff that kept tripping me up:
- Forgetting to put the customer interface in the VRF. Route silently goes to global table, nothing errors out.
- BGP peering up but no VPNv4 routes on the remote PE. Almost always Route Target mismatch.
- Redistributing OSPF into BGP but forgetting BGP back into OSPF. Routes go out, never come back.
- EIGRP metrics not surviving MP-BGP unless extended communities are set right. show bgp vpnv4 unicast all and show vrf detail are the two commands I lean on the most when something is off. I also recorded the whole lab for my own notes. Sharing in case it helps anyone studying the same topics, not trying to promote anything. PDF and configs are in the description. https://youtu.be/AGZPMUTmnOw Anyone have other gotchas worth knowing? Still learning.