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RE: [spring] “SRV6+” complexity in forwarding

Ron Bonica <rbonica@juniper.net> Fri, 20 September 2019 17:33 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: Dirk Steinberg <dirk@lapishills.com>, Tom Herbert <tom@herbertland.com>, "Darren Dukes (ddukes)" <ddukes@cisco.com>, "xiechf@chinatelecom.cn" <xiechf@chinatelecom.cn>, SPRING WG <spring@ietf.org>, 6man <6man@ietf.org>, Rob Shakir <robjs@google.com>, Tarek Saad <tsaad.net@gmail.com>
Subject: RE: [spring] “SRV6+” complexity in forwarding
Thread-Topic: [spring] “SRV6+” complexity in forwarding
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Date: Fri, 20 Sep 2019 17:33:02 +0000
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Robert,

Even then, the core SP router may ignore the PSSI.

Recall that the first two bits of the PSSI option are 00. This means that if the processing node doesn’t recognize the PSSI, or is configured to ignore the PSSI, it will simple skip over the PSSI.

In most cases, core SP routers will be configured to ignore the PSSI.

                                                                             Ron

From: Robert Raszuk <robert@raszuk.net>
Sent: Friday, September 20, 2019 1:22 PM
To: Ron Bonica <rbonica@juniper.net>
Cc: Dirk Steinberg <dirk@lapishills.com>; Tom Herbert <tom@herbertland.com>; Darren Dukes (ddukes) <ddukes@cisco.com>; xiechf@chinatelecom.cn; SPRING WG <spring@ietf.org>; 6man <6man@ietf.org>; Rob Shakir <robjs@google.com>; Tarek Saad <tsaad.net@gmail.com>
Subject: Re: [spring] “SRV6+” complexity in forwarding

Hi Ron,

No one is questioning that. If packet's destination is not a local address of a router all options can be ignored.

Fun however starts when destination address in the packet *is* a local address on the router ie. the router is acting as Segment Endpoint.

Thx,
R.

On Fri, Sep 20, 2019 at 7:09 PM Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>> wrote:
Likewise, SP core routers would ignore the PSSI and wouldn’t even see the PPSI.

                                                      Ron


From: Dirk Steinberg <dirk@lapishills.com<mailto:dirk@lapishills.com>>
Sent: Wednesday, September 18, 2019 7:40 PM
To: Tom Herbert <tom@herbertland.com<mailto:tom@herbertland.com>>
Cc: Darren Dukes (ddukes) <ddukes@cisco.com<mailto:ddukes@cisco.com>>; xiechf@chinatelecom.cn<mailto:xiechf@chinatelecom.cn>; SPRING WG <spring@ietf.org<mailto:spring@ietf.org>>; 6man <6man@ietf.org<mailto:6man@ietf.org>>; Robert Raszuk <robert@raszuk.net<mailto:robert@raszuk.net>>; Ron Bonica <rbonica@juniper.net<mailto:rbonica@juniper.net>>; Rob Shakir <robjs@google.com<mailto:robjs@google.com>>; Tarek Saad <tsaad.net@gmail.com<mailto:tsaad.net@gmail.com>>
Subject: Re: [spring] “SRV6+” complexity in forwarding

SRv6 does not require TLV processing for normal forwarding (use case: SP core).

- Dirk



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