Alcatel Unleashed

If I am investigating a 6850 switch, which is connected to a 7700 via fibre because users have reported a sudden general slowness with the Network, what information I should be looking for in the switch (6850) that would indicate there is a problem on that switch?

All ports are running at 1000MBs and Full Duplex

Thanks

Do this for each port along the data path, not just the ports that directly attached to the end stations:
show interfaces slot/port
show interfaces slot/port counters
Check speed and duplex are correct and match the other side of the connection. Run this command on the same interface multiple times to verify errors (Error Frames, CRC Error Frames, Alignment Errors, Status Change) are not incrementing. If the error counts are incrementing verify the health of the cabling as well as the NIC involved. If the port is set to full duplex and these errors are still incrementing, verify the duplex setting on the other side of the connection. Finally, if these commands were run while the end stations were trying to ping each other, verify Bytes Received is incrementing. If is not, verify the NIC card.
Verify the health of the switch with the show health, and show health slot commands. Any variables that have reached or exceeded their limit value could cause forwarding problems on the switch. Use the show log swlog command to view the system log file. Look for evidence of a system or interface problem around the time the problem began. For detailed analyze use "OmniSwitch Troubleshooting Guide".

Slow switch ... Slow local network or slow internet......

I test the 6850 connect to 3com and the port is for example :
ALCATEL
vlan 3 port default 1/5
vlan 210 802.1q 1/22

3Com
Fa0/1
switchport mode acces

verify you speed of port and force the port to 1GBps.


if you port is in mode trunk in two sides not problem, but if you have a port trunk and the other side you port is mode acces ( port default ) the network not working good ( ping will have much loss and delay ).