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interface up time and danger of STP topology change

Mary
Beginner
Beginner

I have one interface g1/0/3 is flapping, but i go to sh int g1/0/3

Last clearing of "show interface" counters 1y5w. does it mean the interface is up for 1 year 5 week? which filed shows the up time for the interface?

we have received alert of stp topology, there are many stp change every day, which kind of stp change we should pay attention? what are the common remedies for stp topology change, thanks

2 Replies 2

josef.kokal
Beginner
Beginner

Hi,

unfortunately you aren't able to see since when the interface is up.
Via "show int ..." you can see how many packets, errors etc were received on the interface since the last time these counters were cleared.
For troubleshooting purpose you can manually reset those counters via "clear counters ..."
So the counters have nothing to do with the uptime of the interface.
Your only chance are some logfiles were you may be able to see up/down messages of the interface.

Topology changes are normal and shouldn't have any impact on your network if they aren't massive.
A simple switch failure, link up/down event could cause those changes. Just ensure to configure your ports correctly (Portfast, BPDUGuard, Prioritiy etc)

we have frequent toplogies one day 10 times topology change for particular trunk port, but port is configured correctly, so what is the action plan?

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