Add VLAN to trunk causes switch to drop

[Terren_Crider]

Hi all, I've got two switches separated by about 7 miles of fiber and an Internet link at each site. I need a certain number of VLANs to extend between the sites for HA purposes. VLANs: tagged 243, 923-925, 927, 1000, untagged 4040 All of these VLANs span the trunk no problem except for 927. When I apply 927 the distant switch drops. When I remove 927, it comes back. Spantree is applied and enabled at the HA site, but not the main site. Where do I need to look to solve this problem?

[Jeremy_Gibbs]

When you run the command show spantree debug port *.*.* active

send a screen shot.. look for a high number of tx bpdu's

Also, read this:

http://documentation.extremenetworks.com/EOS_Config/S-K-Series/S-K-7100_Configuration_Guide/c_multis...

[Terren_Crider]

Adminedge and spanguard are both off. Primary site is an S4 running 08.32.02.0009. HA site is a K10 with 08.41.01.0004.

[Nick_Yakimenko]

What is in the logs of both switches?

[Terren_Crider]

This is a snippet of the logs from the HA site switch. The primary site switch does not show any related logs.

[Terren_Crider]

<165>Mar 13 22:29:04 10.40.40.253 LinkTrap[11]Interface vlan.0.1000 is Down. <165>Mar 13 22:29:04 10.40.40.253 Spantree[11]Receive Event: Multiple BPDU sources received on Port = tg.11.1, BPDU Bridge MAC = 20:b3:99:57:d4:e8 Port = 338 Prior Bridge MAC = cc:f9:54:27:0e:3d Port = 2309 <165>Mar 13 22:29:04 10.40.40.253 LinkTrap[11]Interface vlan.0.4040 is Down. <165>Mar 13 22:29:04 10.40.40.253 Spantree[11]Receive Event: Multiple BPDU sources received on Port = tg.11.2, BPDU Bridge MAC = cc:f9:54:27:0e:3d Port = 2309 Prior Bridge MAC = 20:b3:99:57:d4:e8 Port = 337 <165>Mar 13 22:29:04 10.40.40.253 System[11]Reconnect attempted for logging server 1 (10.0.200.216) <165>Mar 13 22:56:16 10.40.40.253 LinkTrap[11]Interface tg.11.2 is Down. <165>Mar 13 22:56:16 10.40.40.253 Spantree[11]Multiple BPDU sources received condition has been cleared for Port = tg.11.2 <165>Mar 13 22:56:16 10.40.40.253 System[11]Reconnect attempted for logging server 1 (10.0.200.216) <165>Mar 13 22:56:35 10.40.40.253 LinkTrap[11]Interface tg.11.1 is Down. <165>Mar 13 22:56:35 10.40.40.253 Spantree[11]Multiple BPDU sources received condition has been cleared for Port = tg.11.1 <165>Mar 13 22:56:40 10.40.40.253 LinkTrap[11]Interface tg.11.1 is Up. <165>Mar 13 22:59:03 10.40.40.253 LinkTrap[11]Interface tg.11.1 is Down. <165>Mar 13 22:59:05 10.40.40.253 LinkTrap[11]Interface tg.11.2 is Up. <165>Mar 13 23:01:09 10.40.40.253 System[11]PoE Mode button has been activated. <165>Mar 13 23:01:44 10.40.40.253 LinkTrap[11]Interface tg.11.1 is Up.