I have a strange situation I'd like to run by the community. We have recently acquired a 200 meg ethernet connection to replace our OC3 between two of our major markets. Both connections are running mpls. The OC3 has an MTU of 4470 of course and the Ethernet is set to 9000. We tested the Ethernet circuit last week and everything looked good. There are no errors on either end of the connection. No packet loss or latency. Both MPLS VPN and MPLS traffic function great.
The problem has to do with a handful of ATM xconnects that we have built between two PE routers that run across that intermarket link. When we roll traffic to the Ethernet connection we take 50% packet loss. When we roll back to the OC3 the packet loss clears up. The only traffic we know of that is affected is the ATM xconnects. The one thing we found out that we didn't know was that the ethernet connection is actually an EoMPLS connection through our carriers network. I'm not sure how that would impact things.
One end of the ethernet connection is plugged into a Gig switchport on a switching blade with IP term on a vlan SVI in a 7606 Sup 720 3BXL. The other end is on a SUP720 3BXL gig subint on a 7603. Another interesting point. The loss only seems to occur on traffic from the 7603 to the 7606. Traffic from the 7606 to the 7603 seems to work fine.
Is shaping not supported on the WS-X6724-SFP? or on the Gig port on the SUP720?
No and No. You need a WAN module for shaping..
Why would traffic pass fine in one direction and not the other?
Very hard to troubleshoot on an internet forum. I recommend opening a ticket with TAC and the provider to find the real issue..