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Shim Format Suggestion Assumes 18 bit RBridge nicknames K = Known unicast frame if 1, multicast/broadcast/unknown if 0. A, B, C, D = spare reserved bits. E = Extensions size and bits octets present. RBridges that do not support any extensions do not need to understand this bit. Extension size is there only so that intervening devices can always snoop beyond the shim in RBridge frames. Such devices need to understand the E bit and Extensions Size field. Extensions Size Extension Bits Hop Count Ingree RBridge nickname Egress or tree-root RBridge K A B C D E |