Santanu,
On 4/2/15 13:32 , Santanu Kar wrote:
Hi Peter
-----Original Message-----
From: Peter Psenak [mailto:ppse...@cisco.com]
Sent: Thursday, April 02, 2015 3:48 PM
To: Santanu Kar; ospf@ietf.org; sprev...@cisco.com; cfils...@cisco.com;
han...@juniper.net; rob.sha...@bt.com; wim.henderi...@alcatel-lucent.com
Cc: penchala.re...@ipinfusion.com
Subject: Re: PHP route determination in
draft-ietf-ospf-segment-routing-extensions-03
Santanu,
On 4/2/15 11:34 , Santanu Kar wrote:
Hi Peter
I think, considering we are using Ext Prefix LSA in 'Area-Flooding'
scope, A should do PHP for 20.1.1.0/24 if C has advertised it.
I do not see why would you do PHP, if B is not advertising the SID.
If A doesn’t pop for 20.1.1.0/24, and give the packet to B, it will
drop it, since PHP is enabled by default for all nodes.
why would it drop? B will get the packet with the label that corresponds to
20.1.1.0/24.
[SANTANU] Since PHP is enabled globally, B may not expect a label packet for
20.1.1.0/24 as it expects it to be POPed in penultimate node. So B may
choose not to install any POP entry for 20.1.1.0/24. In that case packet
will be dropped.
then it's a problem of B.
Peter
regards,
Peter
Regards
Santanu
-----Original Message-----
From: Peter Psenak [mailto:ppse...@cisco.com]
Sent: Thursday, April 02, 2015 1:08 PM
To: Santanu Kar; ospf@ietf.org; sprev...@cisco.com;
cfils...@cisco.com; han...@juniper.net; rob.sha...@bt.com;
wim.henderi...@alcatel-lucent.com
Subject: Re: PHP route determination in
draft-ietf-ospf-segment-routing-extensions-03
Santanu,
If B is not advertising a SID for 20.1.1.0/24, then A will not do PHP.
regards,
Peter
On 4/2/15 08:39 , Santanu Kar wrote:
SANTANU> Iactually wanted to highlight the non-ABR cases here.
SANTANU> Consider
the3routers below,in same area.
A -----10.1.1.0/24----- B ------20.1.1.0/24 -----C
In thecontext of A, the route of 20.1.1.0/24 <http://20.1.1.0/24> is
a PHP route. Now the Prefix Segment for prefix 20.1.1.0/24
<http://20.1.1.0/24> can be advertised by bothB, as well as by C
towards A. The case I am considering here is, C has advertised the
prefix segment of 20.1.1.0/24 <http://20.1.1.0/24> to
Afirst.Stillwhen A is calculating label for20.1.1.0/24
<http://20.1.1.0/24>,it should take it as PHP. Howeverthe text in
draft states "upstream neighbor of the Prefix-SID originator MUST pop
the Prefix-SID". Here A is not the upstream neighbor of C.
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