Re: [mpls] Clarification on the motivation of draft-xu-spring-islands-connection-over-ip-05

Eric C Rosen <erosen@juniper.net> Mon, 11 April 2016 18:51 UTC

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Subject: Re: [mpls] Clarification on the motivation of draft-xu-spring-islands-connection-over-ip-05
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On 4/7/2016 6:39 PM, Xuxiaohu wrote:
> [Xiaohu] The FEC associated the above label L is the /32 or 128/ prefix of node N. When the IGP next-hop towards that FEC is a non-MPLS node, the LSR receiving the above MPLS packet with top label of L is desired to forward that MPLS packet towards node N via an IP-based tunnel. In this case, the node N is the remote peer for that FEC.

Yes, in this case, the tunnel's receive endpoint can be regarded as a 
remote label distribution peer of the tunnel's  transmit endpoint.

However, in the above case I don't think it is obvious that you want to 
IP-tunnel the packet to N.  You might just want to tunnel it around the 
non-MPLS node.   In that case, the tunnel's receive endpoint can still 
be regarded as a remote label distribution peer of the transmit 
endpoint, but the receive endpoint is not N.