I have two 8310 units with a four port IST working fine. However, if I create a simple loop with a normal CAT5 cable connected to both 8310's (seperate ports)the CPU goes balistic and I end up with a useless solution (loop).
If I create a loop on the SAME 8310 the loop is correctly detected (and doesn't affect the network) and blocks the lower priority port. If the loop goes via the IST - then a loop exists AND takes down the network.
Nortel's standard STG on the IST allows this condition to continue until the cable is withdrawn.
If you disable Nortel's STG on the IST and use Cisco compatable STG then after a period of time the CPU disables the port creating the loop due to excessive traffic (CP limit)and the condition to normality returns.
It would appear that spanning tree traffic does not traverse the IST or is filtered??
Any ideas?
If I create a loop on the SAME 8310 the loop is correctly detected (and doesn't affect the network) and blocks the lower priority port. If the loop goes via the IST - then a loop exists AND takes down the network.
Nortel's standard STG on the IST allows this condition to continue until the cable is withdrawn.
If you disable Nortel's STG on the IST and use Cisco compatable STG then after a period of time the CPU disables the port creating the loop due to excessive traffic (CP limit)and the condition to normality returns.
It would appear that spanning tree traffic does not traverse the IST or is filtered??
Any ideas?