Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

TCP Retransmission ??

There are lots of TCP Retransmission packet from host A to host B (no such packet from B to A), so the speed between them is slow. No errors on the switch ports. What's the reason couse that and how can I do to improve it?? Host A is a 10/100 M and set to auto and host B is 10/100/1000 M and set to auto.

Thanks.

1 REPLY
Green

Re: TCP Retransmission ??

It could be your cabling.

If you have home-made / hand-made jumper cabling, and it's not terminated properly or is damaged, it can cause the problems you describe (due to excessive crosstalk).

If you check the console of both switches, one of them may be telling you about a duplex mismatch.

If one host is running GigE into the switch, and the other is only 100M, you may be running into some congestion issues especially if the host on the 100M is popular and has several hosts accessing concurrently.

There's another couple possibilities, if you could post a sniffer trace from each host's side and (if available) the configs for the intermediate switches and any other logs you may have, it would help.

Thanks

Scott

526
Views
0
Helpful
1
Replies