[Idr] draft-ietf-idr-vpn-prefix-orf
Igor Malyushkin <gmalyushkin@gmail.com> Tue, 17 January 2023 17:42 UTC
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From: Igor Malyushkin <gmalyushkin@gmail.com>
Date: Tue, 17 Jan 2023 21:41:56 +0400
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To: draft-ietf-idr-vpn-prefix-orf@ietf.org, "idr@ietf. org" <idr@ietf.org>
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Subject: [Idr] draft-ietf-idr-vpn-prefix-orf
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Dear authors,
I have a question regarding Section 5.1, specifically about the encoding of
the Source TLV.
Source PE TLV is defined to identify the source of the VPN routes.
Using source PE and RD to filter VPN routes together can achieve more
refined route control. The source PE TLV contains the following
types:
* In single-domain or Option C cross-domain scenario, NEXT_HOP
attribute is unchanged during routing transmission, so it can be
used as source address.
Type = 1, Length = 4 octets, value = NEXT_HOP.
Type = 2, Length = 16 octets, value = NEXT_HOP.
Despite the fact that this section covers a case when NEXT_HOP is not
changed it does not cover the case when a single PE uses several NEXT_HOP's
values for the same SAFI (specifically IP VPN). So I don't think that
the highlighted part is true. Isn't it better to specify using some
internal router's value (e.g., router ID)? Using a NEXT_HOP's value can be
only a last resort option when we don't have the TLV and community encoded.
Any thoughts?
- [Idr] draft-ietf-idr-vpn-prefix-orf Igor Malyushkin