Vlan mismatch effects?

[louis0001]

Our MPLS provider asked us to peer on vlan 4094 using a /30. Now, silly me put in vlan 4096 by mistake.

Traffic still flows though. Is there likely to be any side effects of this eg latency, packet loss etc?

[Joseph W. Doherty]

If it's an untagged (non-trunk) port, only CDP, if active on both sides of the link, would complain about a VLAN mismatch. No impact to untagged traffic.

[louis0001]

Please could you clarify that. This is a CE router with an interface configured as g0/0/1.4096 so I would assume all packets are tagged? This peers with their PE router.

[Joseph W. Doherty]

Yes, with a subinterface on the router, frames should be tagged.

If other side of link router (the PE) is expecting differently tagged frames I would expect other side to either ignore them or direct them into the wrong VLAN or subinterface. However, you note traffic is flowing, correct? If so, I'm surprised it works.

[louis0001]

Doh, my mistake. I didn't notice that interface was g1/0/0.4096 and encapsulation was 4094 which explains why data was flowing. Thanks for the help.