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Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10

"Acee Lindem (acee)" <acee@cisco.com> Fri, 20 March 2020 14:28 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Alvaro Retana <aretana.ietf@gmail.com>, "draft-ietf-isis-mpls-elc@ietf.org" <draft-ietf-isis-mpls-elc@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Thread-Topic: AD Review of draft-ietf-isis-mpls-elc-10
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Date: Fri, 20 Mar 2020 14:27:52 +0000
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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Hi Peter Alvaro, 

On 3/20/20, 8:58 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:

    On 20/03/2020 11:59, Alvaro Retana wrote:
    > On March 20, 2020 at 6:22:38 AM, Peter Psenak wrote:
    > 
    > 
    > ...
    >>> Besides the in-line comments, I want to point out here that this
    >>> specification is incomplete. It needs to have (1) a formal description of
    >>> the new MSD-Type (similar to §5/rfc8491), and (2) a discussion of the
    >>> interaction with the BMI-MSD.
    >>
    >> sorry, I missed it.
    >>
    >> Entropy Readable Label Depth is defined in rfc8662.
    >>
    >> I have modified the text as foolows:
    >>
    >> "A new MSD-type [RFC8491], called ERLD-MSD is defined to
    >> advertise the ERLD [RFC8662] of a given router. A MSD-Type code 2
    >> has been assigned by IANA for EARLD-MSD."
    >>
    >> Would that be good enough?
    > 
    > Not quite.  According to rfc8662, when a new MSD is defined, the
    > document MUST indicate the meaning of the absence of the MSD
    > advertisement.  For example, it says this about the BMI-MSD: "The
    > absence of BMI-MSD advertisements indicates only that the advertising
    > node does not support advertisement of this capability."
    
    ok, I  will add that.
    
    > 
    > 
    > Also, I need you to talk about the interaction between ERLD-MSD and
    > BMI-MSD.  If both are present, what should happen?  Should one take
    > precedence, should both be ignored, can they coexist without issues???
    
    how are BMI-MSD and EARLD-MSD related?
    
    BMI-MSD signals the total number of MPLS labels that can be imposed.
    
    EARLD-MSD - is defined as the number of labels a router can both:
    
        a.  Read in an MPLS packet received on its incoming interface(s)
            (starting from the top of the stack).
    
        b.  Use in its load-balancing function.
    
    I don't really see why one would affect the other.

I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress capability. While they may be related in the internal ASIC implementation, they are independent from a capability perspective. 

Thanks,
Acee

    
    thanks,
    Peter
    
    > 
    > 
    > Thanks!
    > 
    > Alvaro.
    > 
    >

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