[Isis-wg] draft-ietf-isis-mpls-elc

[<[e-mail]>]

Hi authors, all,

1) I wish the draft gave a precise definition of the RLSDC (Readable Label Stack Deepth Capability). (1)
It's not clear to me whether RLSDC is the number of labels before the ELI label, or the position of the ELI label in the stack, or the position of the EL label in the stack.

2) Also, if the ingress node has limitations in term of the number of labels that it can push (e.g. in the context of SPRING), it could potentially be useful to advertise whether the (EL, ELI) labels may be omitted. i.e. advertising the Readable Label Stack Depth before the IP header can be read for load-balancing purpose. Unfortunately the latter may be dependent on the type of protocol/header following the last MPLS label (e.g. IPv4, IPv6, control word...) but it may be good to have a discussion on this.

Thanks,
Regards,
Bruno

(1) Alternatively, the definition could be provided in draft-ietf-mpls-spring-entropy-label, but this draft is informational. Also it uses a slightly different term: RLD (Readable Label Depth)

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