01-20-2006 11:09 PM - edited 03-03-2019 01:31 AM
i experienced a TCP delay on catalyst 4506, avoid the problem when i replaced 4506's with dummy unmanaged switches.
i used two PCs(PC 1 and PC 2) and two 4506 switches (S1 and S2)
PC 1 is connected to S1 (fast ethernet port)
PC 2 is connected to S2 (fast ethernet port)
S1 is connected to S2 (SFP gigabit ethernet port)
-I started continuous UDP,TCP,MULTICAST and PING from PC1 to PC2
-I unplugged link between Switch 1 and Switch 2
all communication stopped.
-I plugged link between Switch 1 and Switch 2
-UDP,MULTICAST and PING started immediately but TCP started with approximately 15 seconds delay. :-(
I repeated same procedure with unmanaged dummy switches instead of 4506, there wasnt 15 seconds delay. TCP showed up in 1 second.
How can I avoid TCP delay on catalyst switches? Probably some tuning with configuration would do the job?
tx for helping
01-21-2006 11:27 AM
Hello,
do you have the ports on the 4506 switches configured with ´spanning-tree portfast´ ?
And are the ports configured as static access ports, and with fixed duplex and speed settings (configure fixed speed and duplex on the PCs as well) ?
interface FastEthernet0/1
switchport access vlan 1
spanning-tree portfast
speed 100
duplex full
Regards,
GP
01-21-2006 10:42 PM
hi gp and thank you very much for responding to this unusual problem.
- switch ports to the PCs are configured as portfast.
- switch ports between two catalyst switches are not configured (default)
- i didnt use the 'switchport access' command since they are default layer 2 interfaces. would 'switchport access vlan 1' command make any difference?
- i looked at the port status and confirmed connection is 100 mbps full duplex.
unusual issue is; ping, udp, multicast shows up in a very short time after I re-plug the uplink. that proves all ports are in forwarding state. only TCP shows up with delay, which doesnt occur on 200 $ unmanaged switch??
thanks in advance for any suggestions
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