Cisco and Allied Telesyn VLANS

[c1utch]

We have a network backbone built on a 4 fiber rings and connected via layer 3, Allied Telesyn switches. We would like to do a phased switch replacement to Cisco switches, however the Allied Telesyn switches are setup with tagged VLANs and for some reason the tags are not compatible with Cisco VLANS. These tags, which are only on 2 of the 10 or so VLANs, are there because these 2 VLANs contain non-IP traffic (LAT and DECNet) and it's believed that Allied Telesyn switches can only route (static routes by the way) this traffic when the VLAN is tags this way.
We've tried to throw a Cisco switch in this the backbone, recreating the VLANs, including the 2 that contain non-IP traffic and everything works fine EXCEPT the 2 VLANs that have non-IP traffic.

My question is, has anyone else run into this problem and/or do you know of a workaround?

Chris

 

[unclerico]

What kind of Cisco switches are you using?? Depending on the model you may need to make use of fallback briding to move the non IP protocols. Also, I'm not sure how the Allied switches will cooperate with the fallback bridge.

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