09-26-2005 03:06 AM - edited 03-03-2019 10:35 AM
Hello, I do have a general question regarding X25 asymmetrical packet/window size.
We would like to add on an existing X25 routerA a new conx via XOT to routerB, so we have:
DTE1-routerA-XOT-routerB-X25-DTE2
As routerA/B do have asymmetrical w/p size configured I think I need to use the flow-control nerver cmd and the local ack x25 routing?
routerA does not have the local ack configured right now, does this give problems when I add the cmd to routerA for the existing conx ?
Or can I use 'x25 routing acknowledge local' without any problems?
Thanks for help, Thomas
09-26-2005 04:19 AM
Hello Thomas,
the local acknowledgement is required; since it allows packets to be sent without waiting for an acknowledgement from the remote side; it should usually increase throughput, but should not affect your current connections.
As for flow control, that is an optional feature, and not required.
Have a look at the following documents:
X.25 Switch Local Acknowledgment
Feature Overview
X.25 Asymmetrical Windows and Packets
http://www.cisco.com/warp/public/133/x25asym_windows.html
HTH,
GP
09-26-2005 05:48 AM
Thx GP for answer,
I have reviewed your links before but was not quite sure if it has an influence in the exsiting conx.
Up to now we haven't configured 'local ack' and the call from DTE1 fails at routerB side, the call
arrives via XOT, sent out the serial interface to the X25 net, it is confimred by the net and immideatley
is cleared by routerB with cause5,diag64 (call setup problem, Network congestion) and I think
it is due to the fact that the XOT reports other window/packet size than the serial line on routerB is configure.
So I hope with the local ack configuration we will solve the issue,
thanks again for your help, Thomas
09-26-2005 05:59 AM
Hello Thomas,
the call being disconnected right away indeed sounds like a typical symptom of the differing window/packet sizes. I, too, would guess the local acknowledgement solves this...
Regards,
GP
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