Thanks you for replying so fast and usefully.
I checked the configuration again and found that there are loops on the pair of switches really--In VRRP config table,there are 5 vlan in the same priority "100" and the same state "backup" on the two core switches.So when i linked two fiber cables...
There is a problem in our switches(Accelor1200 with 5 fabric modules) recently,the fact is that the two fabric ports are in "blocking" status,but the lights are normal(green and flash),and each port is in the same configuration. I don't know how to solve the problem.
please help me.
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