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Re: [spring] draft-filsfils-spring-net-pgm-extension-srv6-usid-07

Rajesh M <mrajesh@juniper.net> Thu, 10 September 2020 10:45 UTC

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From: Rajesh M <mrajesh@juniper.net>
To: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>, SPRING WG <spring@ietf.org>
Thread-Topic: [spring] draft-filsfils-spring-net-pgm-extension-srv6-usid-07
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Date: Thu, 10 Sep 2020 10:45:24 +0000
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Subject: Re: [spring] draft-filsfils-spring-net-pgm-extension-srv6-usid-07
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Hi peter,

1)  What is the difference between these 2 SIDs
42 | 0x002A | uN | [This.ID] |
46 | 0x002E | uN (S&L+End PSP/USP) | [This.ID] |

uN SID (End behavior with NEXT-CSID, PSP and USD flavors) ,  uN (S&L+End PSP/USD)

2)  just to continue below discussion, can you confirm
51 | 0x0033 | uA                              - here FIB must have 2001:db8:0:FNAJ::/64 route (16 bit Compressed-SID)
52 | 0x0034 | uA (S&X+End.X)     -  here FIB must have 2001:db8:0:0N00:FNAJ::/80 route (32 bit Compressed-SID)

Thanks
Rajesh


-----Original Message-----
From: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>
Sent: Thursday, September 10, 2020 3:36 PM
To: Rajesh M <mrajesh@juniper.net>; SPRING WG <spring@ietf.org>
Subject: Re: [spring] draft-filsfils-spring-net-pgm-extension-srv6-usid-07

[External Email. Be cautious of content]


Hi Rajesh,

On 10/09/2020 03:38, Rajesh M wrote:
> Hi All,
>
> *Section 4.1.21:*
>
> **
>
> In control plane uA SID is advertised with value
> 2001:db8:0:*0N00:FNAJ::*
>
> **
>
> *in FIB entry it is represent with value *2001:db8:0*:FNAJ::/64*
>
> Note: From a formal viewpoint, a uA SID of node N is defined by the
>
> local FIB entry B:uA/64 of N (i.e. this definition is independent from
> any uN SID of node N).
>
> a) why such discrepancy ? between control plane and forwarding plane.

It's explained in the section 4.1.2.1:

"In order to signal in ISIS a container SID with the same routable semantics as End.X"

In other words, we wanted to keep the consistency in a way the SID is advertised for different SID types (e.g. END.X and uA).

thanks,
Peter


>
> b) for uA SID Forwarding happens based upon 2001:db8:0/48 ? not based
> upon 2001:db8:0:*0N00 (uN SID) ?*
>
> **uSID block: 2001:db8:0::/48**
>
> **for uA SID if forwarding is based upon**2001:db8:0/48 then
> Compressed-SID can be 16 bit
>
>     for uA SID if forwarding is based upon**2001:db8:0:*0N00 then
> *Compressed-SID must be 32 bit**
>
> **
>
> Thanks
>
> Rajesh
>
> **
>
>
> Juniper Business Use Only
>


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