Zafar,
My concern is that any load balancing tool might hash on the field where
you have the O-bit, if it does OAM traffic and normal payload traffic
will take different paths through the network.
How do you guarantee this this will not happen?
/Loa
On 2018-05-29 19:11, Zafar Ali (zali) wrote:
Hi Loa,
Thanks for your question.
O-bit "move" from SRH draft to this SRv6 OAM draft is part of a comment
received an agreement made during the LC of the SRH draft. Please review
the mail chain
https://www.ietf.org/mail-archive/web/ipv6/current/msg30131.html. There
was never a suggestion or agreement to "remove" O-bit or SRH.Flags field.
Load balancing and ECMP in an SRv6 network are explained in
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-13#section-4.4.
An implementation is expected to use the minimum of (source, dest)
address and flow label in the outer IPv6 header to compute the hash.
RFC6437 describes the use of flow labels to compute a hash for IPv6
packets.
Thanks
Regards … Zafar
*From: *Loa Andersson <[email protected]>
*Date: *Tuesday, May 29, 2018 at 9:48 AM
*To: *Huzhibo <[email protected]>, "Zafar Ali (zali)" <[email protected]>,
"[email protected]"
<[email protected]>, "[email protected]" <[email protected]>
*Cc: *Lizhenbin <[email protected]>, Yangang <[email protected]>
*Subject: *Re: [spring] About draft-ali-spring-srv6-oam-00
Folks,
I thought we had an agreement to remove the O-bit. As ZhiBo Hu points
out other drafts drops it.
The obvious reason to not use an O-bit is that if it ever is part of
what an multipath functions hash on it will csue OAM traffic and
"normal" traffic to use different paths. This defeats the idea with
OAM traffic.
/Loa
On 2018-05-16 06:56, Huzhibo wrote:
Hi,
draft-ali-spring-srv6-oam-00 says The OAM packets are identified by
setting the O-bit in SRH，But I Notice the latest
I-D.6man-segment-routing-headerhas removed O-bit in the SRH extension
header. I want to confirm that draft-ali-spring-srv6-oam-00 will also
remove o-bit or keep the o-bit in the later version?
Ths
ZhiBo Hu
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Loa Andersson email: [email protected]<mailto:[email protected]>
Senior MPLS Expert
Bronze Dragon Consulting phone: +46 739 81 21 64
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Loa Andersson email: [email protected]
Senior MPLS Expert
Bronze Dragon Consulting phone: +46 739 81 21 64
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