Hey, This is expected behaviour with nexus 5k running spanning tree bridge assurance connecting to a switch not running bridge assurance (ie catalyst switches)
You need to either disable bridge assurance on the 5k, or change the port channel on the 5k to "spanning-tree port type normal" to disable bridge assurance on that port channel only. Cheers, Andrew Jones Alphawest -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Starbug Sent: Thursday, 24 May 2012 12:15 PM To: Tom Mikelson Cc: [email protected] Subject: Re: [c-nsp] problem with VPC port-channel between Cisco 3550 and pair of Nexus 5020 Hi Tom, you should take a look at the spanning tree port type on the nexus: switch# configure terminal switch(config)# interface ethernet 1/8 switch(config-if)# spanning-tree port type network On nexus switches, this sets spanning tree to expect a switch on the other end of the link. regards, AK On May 23, 2012, at 10:54 AM, Tom Mikelson <[email protected]> wrote: > Physical links are up, cdp neighbor shows all devices > Nexus 5020 pair configured with working VPC link on VLAN 11. > Port-channel 64 on both Nexus 5020s show blocked for spanning-tree VLAN 11. > > ***** Nexus 5020s ***** > > interface port-channel64 > description TEST > switchport mode trunk > switchport trunk allowed vlan 11 > speed 1000 > vpc 64 > > interface Ethernet1/8 > description TEST > switchport mode trunk > switchport trunk allowed vlan 11 > speed 1000 > channel-group 64 mode active > > ***** Cisco 3550 ***** > > interface Port-channel64 > description TEST > switchport trunk encapsulation dot1q > switchport trunk allowed vlan 11 > switchport mode trunk > ! > interface GigabitEthernet0/1 > description TEST_to_5020_A > switchport trunk encapsulation dot1q > switchport trunk allowed vlan 11 > switchport mode trunk > channel-group 64 mode active > ! > interface GigabitEthernet0/2 > description TEST_to_5020_B > switchport trunk encapsulation dot1q > switchport trunk allowed vlan 11 > switchport mode trunk > channel-group 64 mode active > ! > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
