The RBridge will not continue forwarding the TRILL frame on the TRILL network upon receiving a TRILL frame with hop count value zero. However, it will decapsulate and forward it to the access even if the hop count is zero, meaning it may terminate the tunnel. The hop count field in the TRILL header is decremented prior to forwarding. The packet may traverse non-TRILL bridges too. Non-TRILL bridges will not decrement the hop count field. The ingress RBridge must initialize the hop count to a value larger than the number of hops needed to reach the destination. The maximum hop count value is 63.
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