Switch loop suggestion - Cisco Router
Hello Experts,
We used to have the following setup in a "cascade" setup.
3comA-connects to 3comB- 3comC connects to 3comD to 3comE and so fort. Total 7 Switches.
We bought a Cisco 2960 and decided to have all the switches connect to the Cisco as the
"Backbone Switch".
So we broke the "cascade" and now every switch connects to a different port on the Cisco 2960.
We are getting a loop after this setup, every now and then different parts of the network loose connectivity. We only have Vlan1 enabled and the default setup that came with the Cisco Switch.
To avoid any other switch from becoming a "root bridge", I ran the following command on the Cisco Switch so that it could be the main router:
spanning-tree vlan 1-4094 priority 0. (This did not work)
Any ideas on how I can find the loop?
Thanks,
R
We used to have the following setup in a "cascade" setup.
3comA-connects to 3comB- 3comC connects to 3comD to 3comE and so fort. Total 7 Switches.
We bought a Cisco 2960 and decided to have all the switches connect to the Cisco as the
"Backbone Switch".
So we broke the "cascade" and now every switch connects to a different port on the Cisco 2960.
We are getting a loop after this setup, every now and then different parts of the network loose connectivity. We only have Vlan1 enabled and the default setup that came with the Cisco Switch.
To avoid any other switch from becoming a "root bridge", I ran the following command on the Cisco Switch so that it could be the main router:
spanning-tree vlan 1-4094 priority 0. (This did not work)
Any ideas on how I can find the loop?
Thanks,
R
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The command to clear the log is either "clear logging buffer" or "clear logging" You have to be in config mode to use it, like this:
conf t
clear logging
end
conf t
clear logging
end
ASKER
Thank you!
ASKER
*Mar 1 06:13:14.327: %IP-4-DUPADDR: Duplicate address 192.168.1.2 on Vlan1, sourced by e83e.b62d.03d9
*Mar 1 06:15:43.770: %IP-4-DUPADDR: Duplicate address 192.168.1.2 on Vlan1, sourced by e83e.b62d.03d9
*Mar 1 06:26:06.549: %IP-4-DUPADDR: Duplicate address 192.168.1.2 on Vlan1, sourced by e83e.b62d.03d9
*Mar 1 06:26:53.827: %IP-4-DUPADDR: Duplicate address 192.168.1.2 on Vlan1, sourced by e83e.b62d.03d9
Looks like a duplicate ip could be causing the loop. We have modified the management ip address.
How can I clear / erase the Log and review the results after changing the ip address?
I don't have access to the config but I will upload as soon as it is available.