Re: [Idr] [bess] Type 1 RD for Pure IPv6 network -- EVPN

"Jakob Heitz (jheitz)" <jheitz@cisco.com> Fri, 29 January 2021 22:21 UTC

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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Gyan Mishra <hayabusagsm@gmail.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: TULASI RAM REDDY <tulasiramireddy@gmail.com>, "bess@ietf.org" <bess@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [bess] [Idr] Type 1 RD for Pure IPv6 network -- EVPN
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Date: Fri, 29 Jan 2021 22:21:20 +0000
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Subject: Re: [Idr] [bess] Type 1 RD for Pure IPv6 network -- EVPN
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Note that the BGP identifier is not guaranteed to be unique across ASes, only within a single AS.

Regards,
Jakob.

From: BESS <bess-bounces@ietf.org> On Behalf Of Gyan Mishra
Sent: Friday, January 29, 2021 1:56 PM
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Cc: TULASI RAM REDDY <tulasiramireddy@gmail.com>; bess@ietf.org; idr@ietf.org
Subject: Re: [bess] [Idr] Type 1 RD for Pure IPv6 network -- EVPN

Muthu

How does RFa. 6286 AS wide BGP identifier change the BGP path selection process when all attributes are equal and ‘bestpath compare-routerid” is uses so the valid/best path is deterministic and oldest versus newest default.

I believe the BGP Identifier just as with OSPF or ISIS does not have to be routable, so in an IPv6 only network precluding RFC 6286 I believe could you still use a 4 octet IP address as the router-id.

This question comes up a lot these days as operations migrate to some flavor of IPv6 only core MPLS LDPv6, SR-MPLSv6, SRv6.


Thanks

Gyan
On Wed, Jan 27, 2021 at 5:45 AM Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail.com>> wrote:
Hi Tulasi,

In pure IPv6 networks, I think using the BGP identifier in place of the IP address part in the type 1 RD should suffice for all practical purposes. The only catch is, if it is an AS-wide unique BGP identifier [RFC6286], then it is not an IP address 'per se'. But, I think it makes no difference from an interoperability standpoint..
Perhaps, in line with RFC6286, we should redefine the IP address part of the type 1 RD as just a 4-octet, unsigned, non-zero integer..
Regards,
Muthu

On Fri, Jan 22, 2021 at 11:31 AM TULASI RAM REDDY <tulasiramireddy@gmail.com<mailto:tulasiramireddy@gmail.com>> wrote:
Hi All,

In a pure IPv6 network, how do one expect to construct the Type 1 RD.
As per EVPN RFC 7432 for EAD per ES, it should be Type 1 RD, but if the loopback address is only IPv6 then what is the expectation here?
Should we use BGP router ID(32bit) here?

From RFC7432: EVPN
8.2.1<https://tools.ietf.org/html/rfc7432#section-8.2.1>.  Constructing Ethernet A-D per Ethernet Segment Route

   The Route Distinguisher (RD) MUST be a Type 1 RD [RFC4364<https://tools.ietf.org/html/rfc4364>]  The

   value field comprises an IP address of the PE (typically, the

   loopback address) followed by a number unique to the PE.

Thanks,
TULASI RAMI REDDY N
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