Routing

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  • 1.  some concept is confused in junos

    Posted 11-25-2012 01:26

    hi,expert,in labeled-unicast config,why still need to add this explict-null,if in ipv4 inet,even we don't add this,it will send label to peer and pop this lable when it receives traffic with this label in the head

     

    it is defined in RFC



  • 2.  RE: some concept is confused in junos
    Best Answer

    Posted 11-25-2012 09:32

    Hello,

    Please see RFC 4798 http://www.ietf.org/rfc/rfc4798.txt

     

    the ingress 6PE Router MUST directly
   perform label imposition of the IPv6 header without prepending any
   IPv4 header.  The (outer) label imposed MUST correspond to the IPv4-
   signaled LSP starting on the ingress 6PE Router and ending on the
   egress 6PE Router.

   While this approach could theoretically operate in some situations
   using a single level of labels, there are significant advantages in
   using a second level of labels that are bound to IPv6 prefixes via
   MP-BGP advertisements in accordance with [RFC3107].

     Also 

     

     The label bound by MP-BGP to the IPv6 prefix indicates to the egress
   6PE Router that the packet is an IPv6 packet.  This label advertised
   by the egress 6PE Router with MP-BGP MAY be an arbitrary label value,
   which identifies an IPv6 routing context or outgoing interface to
   send the packet to, or MAY be the IPv6 Explicit Null Label.

    HTH

    Thanks

    Alex