DLSW ethernet to ethernet low performance

[guido.schneider]

Hello,

i have some questions to DLSW ethernet to ethernet:

In our network we use DLSW to bridge netbios between central and branch offices over a 34MBit/s WAN link.

Now we send a test-file (size 4,9MByte) from branch to central over netbios. After ca. 10 sec. the upload is done.

If we send the test-file from central to branch, the upload needs more than 3 minutes.

I can't explain this issue.

I need help to locate the reason for this problem.

Have somebody an idea?

kind regards

Guido

[mbinzer]

Hi,

please open a case with tac.

Running dlsw with tcp encapsulation over high speed wan links has its own set of challenges.

You most likely need some adjustment of parameters. This needs to be looked at in detail and can not be answered with a simple reply in this forum.

thanks....

Matthias

[jishi]

Hi Guido,

You can try the following commands on both dlsw peer routers:

1. ip tcp path-mtu-discovery

2. dlsw local-peer peer-id x.x.x.x init-pacing-window 100 max-pacing-window 400

3. dlsw remote-peer 0 tcp x.x.x.x tcp-queue-max 400

4. ip tcp window-size 65535 (depend on which version of IOS you are running, this number can be even larger)

After put in those commands, you need to reset the dlsw peer.

If these help, you can further adjust the these values.

Jing

[jishi]

If tunning DLSw numbers doesn't help, you might hit the bug CSCec66723, which is fixed in 12.2(24a), 12.3(10).

[guido.schneider]

Hello,

thanks for your replys. I have found the failure.

"dlsw bridge-group 1 llc2 ack-max 1" is the soultion.

Because the Netbiso clients have a windows zize of one.