"What do you mean: You might confirm that this VLAN isn't seeing a GLBP hello from any other VLAN. I.e., confirm there isn't any possible leakage between VLANs. "
I mean you should verify your topology to insure that VLANs and subnets don't (unexpectedly) share the same wire. Unlikely, but I see you're using secondary addressing which is unusual when you have VLAN support. (I.e. normally would expect your two subnets to be in their own VLANs.)
"And how will I do that? "
Perhaps activate debug for GLBP and see what GLBP packets you're receiving. Confirm they're from the neighbor you expect.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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