I have a setup of layer2 VPN (xconnect) from 7609 to 7609. The customer is connected to 7609 port directly. Now i have shifted a customer on 3750 switch port & created a sub-interface on 7609, but customer is facing some degradation in traffic. I don't see any errors/packet drops/collisions/etc. I checked the MTU size on 3750 is 1500, and i haven't configured MTU parameters on 7609 as well.
What would be the suspected issue? Ping result is fine end-to-end. No QoS is implemented.
Many thanks in advance.