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Add VLAN to trunk causes switch to drop

Add VLAN to trunk causes switch to drop

Terren_Crider
Contributor
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?
21 REPLIES 21

Drew_C
Valued Contributor III
Hi Terren, Do you have anything from GTAC that you can share with the group?

Negative. The resolution I'm pursuing is to institute a new VLAN to carry 927s current load. It seems to work. The true scope of the issue would likely involve a re-engineering of sorts.

Jeremy_Gibbs
Contributor
How do you have STP configured on that Avaya device? Is it running STP or is it broadcasting out BPDUs of its own with itself labeled as the root bridge?

I am suspecting it is some weird STP config on a device.

Weird.. do share the results!
GTM-P2G8KFN