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Re: [mpls] working group last call on draft-ietf-mpls-spring-entropy-label

Stewart Bryant <stewart.bryant@gmail.com> Sat, 07 May 2016 20:52 UTC

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Sat, 07 May 2016 21:52:46 +0100
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Subject: Re: [mpls] working group last call on draft-ietf-mpls-spring-entropy-label
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On 07/05/2016 18:20, Carlos Pignataro (cpignata) wrote:
> The paraphrasing is accurate, but I feel it does matter. Say you have a series of Adj-labels. For example (N=node, A=Adj): N1-A1-A2-A3-N2-Payload. N1 is top, N2 is bottom of stack. There’s an RLD of 4. Placing a EL/ELI after A2 or A3 is effectively of null value practically. (E.g., A2 and A3 are specific links, but N1 and N2 are long loose paths). The places where LB could happen while the packet is switched with N1 and N2 will not have an EL/ELI readable, and A2 A3 won’t use EL/ELI.
Why would you put an ELI in the middle of a set of adj labels? Surely 
you want the packet to unconditionally go through those labels?

- Stewart

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