I just upgraded my 7206 from an NPE-400 to an NPE-G1. It is a WAN router connected to a core switch (6500). The connection between them (as a point to point routed link) was 100/full, and is now 1000/full over copper. The Gigabit interface on the router is now reporting overruns, and I am seeing packet loss in an IP Video application that runs over the WAN. I didn't see that with the NPE-400.
In the TAC case colletion I found this:
It states: "On some interface types, this chipset and packet buffer cannot handle a long burst of frames. Such interfaces are meant to provide connectivity to a certain network type, and not to switch packets at line rate. The line rate of these interfaces is often higher than the switching capacity of the router."
A solution would be to slow down the traffic coming from the 6500, but I would like some suggestions on how to do it. QoS on the 6500 isn't an option at this point. Enabling flowcontrol on the switch?
I just can't believe I have problems on a gigabit interface that is only passing about ~35Mbps.