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Re: [bess] draft-ietf-bess-evpn-prefix-advertisement-05 comments

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Tue, 17 October 2017 12:18 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "draft-ietf-bess-evpn-prefix-advertisement@tools.ietf.org" <draft-ietf-bess-evpn-prefix-advertisement@tools.ietf.org>, BESS <bess@ietf.org>
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Date: Tue, 17 Oct 2017 12:18:11 +0000
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Subject: Re: [bess] draft-ietf-bess-evpn-prefix-advertisement-05 comments
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Hi Jorge,

>     >        +----------+----------+----------+------------+----------------+
>     >        | ESI      | GW-IP    | MAC*     | Label      | Overlay Index  |
>     >        |--------------------------------------------------------------|
>     >        | Non-Zero | Zero     | Zero     | Don't Care | ESI            |
>     >        | Non-Zero | Zero     | Non-Zero | Don't Care | ESI            |
>     >        | Zero     | Non-Zero | Zero     | Don't Care | GW-IP          |
>     >        | Zero     | Zero     | Non-Zero | Zero       | MAC            |
>     >        | Zero     | Zero     | Non-Zero | Non-Zero   | MAC or None**  |
>     >        | Zero     | Zero     | Zero     | Non-Zero   | None(IP NVO)***|
>     >        +----------+----------+----------+------------+----------------+
>     >
>     >     The fifth row is like a variation of the fourth row;  why isn't there a
>     > corresponding variation for each of the first three rows? The following
>     > paragraph mentioned earlier seems to apply to all situations.
>     > [JORGE] in rows 4 and 5, the label value 0 or non-0 has a meaning. In the
> first
>     > three rows, the label doesn’t have any meaning.
> 
>     Can you elaborate on "the label does not have any meaning", especially for
> row #2?
> [JORGE] since an overlay index is used, a recursive resolution is needed. Hence
> the label is not used to forward packets. “Don’t Care” means a valid 0 or non-
> zero label value should be ignored.
> 
	
But Row 4/5 is the same - there is a MAC address as overlay index, so:

- either we "don’t care" the label for row 4/5 and just use overlay index, or
- do the same with for rows 1/2/3 as with rows 4/5 and do label based forwarding based on local policy

I'm just curious why there is a difference?

Thanks.
Jeffrey

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