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RFC 2105 (rfc2105) (4277 words) |
 | In downstream allocation, the tag that is carried in a packet is generated and bound to a prefix by the switch at the downstream end of the link (with respect to the direction of data flow). |
| Tag allocation is thus driven by topology (routing), not traffic - it is the existence of a FIB entry that causes tag allocations, not the arrival of data packets. |
| When a tag switch receives a binding between a multicast tree and a tag from another tag switch, if the other switch is the upstream neighbor (with respect to the multicast tree), the local switch places the tag carried in the binding into the incoming tag component of the TIB entry associated with the tree. |
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