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Observations
As long as a non-DRB hears the DRB’s Hellos, no reason it needs to listen to, or send, IS-IS Hellos on other VLANs
Forwarding data (especially multicast) is a mess if every adjacency requires a different (outside) VLAN tag
So, each LAN needs to have a single VLAN tag for inter-RBridge communication

PPT Version