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6. Subsequent Address Family Identifier

This document defines the following values for the Subsequent Address Family Identifier field carried in the MP_REACH_NLRI and MP_UNREACH_NLRI attributes:

  • 1 - Network Layer Reachability Information used for unicast forwarding
  • 2 - Network Layer Reachability Information used for multicast forwarding

An implementation MAY support all, some, or none of the Subsequent Address Family Identifier values defined in this document.

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