ALu 6850e - Cisco 3750 at 10Gb/s

[jase]

Hi,

I have a problem i wondered if you could help with.

I have a 7450 -> 6850e running at 10Gb/s with the 6850e acting as NTE. The customer side of the 6850 (1/25) is facing a 3750 again on 10Gb/s. Testing using windows server backup/restore to provide loading.

I have two test servers( server1 & server2) locally at site and two remote test servers on another site, all on 1Gb/s NICs. Although each server targets an individual remote server, they are on the same vlan.

If i connect both servers to the 3750 and test against their partner, when run individually they reach 700Mb/s+. When i run them together the individual speeds reduce to about 200Mb/s

Noticibly, if i connect server1 directly onto the 6850e (1/4) and leave server2 behind the 3750, when i run the same test they both run at 700Mb/s. If i connect both server1 and server2 to the 6850e and run them together they also run at 700Mb/s+

So the fail condition is both servers behind the 3750 for traffic sent from server1 and server2.

If i reverse the test (do a restore instead of a backup) with both server1 and server2 at the 6850, the speeds are approx 200Mb/s.

Testing indicates a problem only when the servers are transmitting together. Can you think of any reason why traffic should be affected so badly?

NB. Sorry for the info overload - however if you need any specific info please ask.

thanks
Jase

[jase]

Just for record. This has been sorted by removing the QoS settings applied to the 10G & 1G ports.

NB. ingress/egree max bandwidth statements i would think are realy policing statements, however their removal as stated seems to of fixed the problem. Only issue i have now i to replace the removed config with something similar as its requirement is still there (prevent 10G UNI from overwhelming 1G UNI at the NNI as UNI ports are for different services)

qos port 1/24 trusted maximum egress-bandwidth 1.00G maximum ingress-bandwidth 1.00G
qos port 1/25 trusted maximum egress-bandwidth 9.00G default classification 802.1p maximum ingress-bandwidth 9.00G

port 1/26 = 10G NNI