MPLS Throughput Issue

[roycemathew]

Hi All,

I have a strange issue with one of my customer where they are reporting off slow transfer rates between sites.

Site 1 ---> Site 2 - File access is slower compared to other-way around

QOS being setup to prioritize the traffic and not helping in any ways.

Any clue on where to start tshoot with.

Any Help comment much appreciated.

[Vinit Jain]

Can you check what is the QoS configuration on the PE connecting to Site 1 and Site 2. It may be possible that Site 2 might have some outbound qos policy configured.

Also, another quick way to test or isolate the SP network would be to attach a dummy CE at both site 1 and site 2 locations (locally in ur SP network not on the customer premises) and test teh file transfer.

Please share the configuration from both PE routers.

Regards

Vinit

[pwwiddicombe]

If this is Windows CIFS file transfer (??) be aware that there may be window size differences; particularly if you have windows server at one end and workstation at the other.  This doesn't normally affect you much on a LAN, but on a WAN link, even if your FRAME size is standard ethernet, the window size for the file transfer may be different.  Run wireshark during a transfer, and it may give you that information.

Another thing could be fragmentation.  If somewhere along the path you have a lower MTU than the endpoints, packets may be split and causing additional delay.