Hi, I have a 3550-48-EMI running 2 MST spanning tree instances.
What's happening is that when an ethernet interface is connected or disconnected 5 of the ports on the switch move back to a learning state. The ports that are changing to a learning state are both trunk & access ports. I'm not too familiar with spanning-tree and this is my first attempt to get it going, I don't believe this is normal though. This is the config I am running on this particular switch that is doing weird things: ! spanning-tree mode mst no spanning-tree optimize bpdu transmission spanning-tree extend system-id ! spanning-tree mst configuration instance 10 vlan 50, 69-70, 92-96, 98-99, 291, 350, 498-509, 550, 603 instance 10 vlan 605-606, 701, 703, 750, 761, 800-802 instance 15 vlan 1-49, 51-68, 71-91, 97, 100-290, 292-349, 351-497, 510-549 instance 15 vlan 551-602, 604, 607-700, 702, 704-749, 751-760, 762-799 instance 15 vlan 803-4094 ! spanning-tree mst hello-time 4 spanning-tree mst 10 priority 61440 spanning-tree mst 15 priority 61440 ! ! interface FastEthernet0/12 description Uplink to Somewhere switchport trunk encapsulation dot1q switchport mode trunk switchport nonegotiate shutdown no cdp enable spanning-tree mst 10 port-priority 32 spanning-tree mst 15 port-priority 64 end ! ! interface FastEthernet0/48 description Uplink to Somewhere switchport trunk encapsulation dot1q switchport mode trunk speed 100 duplex full spanning-tree mst 10 port-priority 64 spanning-tree mst 15 port-priority 32 end ! Any help appreciated! -Dan _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
