Re: [Isis-wg] WG Adoption Call for draft-xu-isis-encapsulation-cap

[Philip Christian <[e-mail]>]

Please can you explain why you are proposing a new protocol extension to
do this when there is an existing extension which already achieves
exactly the same thing? i.e. the Encapsulation capability TLV described
in ITU-T G.7712 and in draft-ietf-isis-auto-encap-03.

thanks, Philip

> 
> Your understanding is correct that this draft follows the idea of
> RFC5512. That's to say, it allows automatical discovery of the tunnel
> decapsulation capability of tunnel egress nodes). The tunnel
> decapsulation capability includes but not limited to tunnel types,
> tunnel parameters (e.g., GRE key, L2TP session ID and cookie) and
> encapsulated protocols. In contrast with the tag proposal, there is
> no need for operators to manually configure many mappings between
> tags and tunnel decapsulation capabilities on each router. The manual
> configuration of such mappings is error-prone and therefore should be
> avoided if possible, IMHO.
> 
> Best regards,
> Xiaohu
>