We recently deployed a stack of five 5420F series switches and configured a trunk back to our MDF which is an old Enterasys S3. All VLANs over the trunk are tagged on both ends with no untagged traffic configured over the trunk. The same VLANs are configured on both ends of the trunk so the allowed traffic matches up on both ends of the trunk.
For whatever reason, only traffic from the default VLAN 1 flows over the trunk. Any traffic for any of the other VLAN's are failing.
I have trunks between some old "B5K" series Enterasys switches working with newer X450 series switches but only when one of the VLAN's are untagged.
Has anyone seen an issue with the older Enterasys switches requiring one VLAN to be untagged on trunks to newer EXOS based switches? Does anyone know if this is required for trunks between the Enterasys S-series switches and EXOS based switches?
From a technical side, I have a LAG setup to manage the trunk on the S3 and sharing enabled to manage the trunk in EXOS on the 5420F stack.
Thanks in advance for any help privided!
