Hi Malik,
I cannot see scenario when bootstrapping LSP Ping has the same source IP
address and BFD Discriminator. Something must be different. Consider two nodes
with ECMP �C A and B. A bootstraps two FD sessions with two LSP Pings. True, IP
Source addresses are the same in both as well as FEC. But Discriminators will
be different as they must e unique within the same node. Right? If the case of
three nodes when two set BFD sessions to the same FEC on the third and
accidentally pick the same Discriminator, then IP source addresses must be
different between them. Am I missing something?
Regards,
Greg
From: Rtg-bfd [mailto:[email protected]] On Behalf Of MALLIK MUDIGONDA
(mmudigon)
Sent: Thursday, July 16, 2015 10:15 PM
To: Santosh P K; S. Davari
Cc: [email protected]; [email protected]
Subject: Re: issues about draft-ietf-bfd-rfc5884-clarifications-02
Hi,
The question is even with LSP ping, how to de-mutiplex if all the parameters
are the same. That’s where the source address comes into picture.
Thanks
Regards
Mallik
From: Santosh P K <[email protected]<mailto:[email protected]>>
Date: Friday, 17 July 2015 10:21
To: "S. Davari" <[email protected]<mailto:[email protected]>>
Cc: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>, Mallik Mudigonda
<[email protected]<mailto:[email protected]>>,
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: RE: issues about draft-ietf-bfd-rfc5884-clarifications-02
Sharam,
True but here it is 5884 and for 5884 (MPLS BFD) we do bootstrapping using
LSP ping and that exchange discr right? So you should ideally not receive any
BFD packet with your_disc = 0.
Thanks
Santosh P K
From: S. Davari [mailto:[email protected]]
Sent: Friday, July 17, 2015 9:51 AM
To: Santosh P K
Cc: [email protected]<mailto:[email protected]>; MALLIK MUDIGONDA
(mmudigon); [email protected]<mailto:[email protected]>
Subject: Re: issues about draft-ietf-bfd-rfc5884-clarifications-02
Hi Santosh
I think the issue is the first BFD packet that has your Desc =0. Question is
how to differentiate them when they are from different ingress LSR.
Regards,
Shahram
On Jul 16, 2015, at 8:48 PM, Santosh P K
<[email protected]<mailto:[email protected]>> wrote:
Hello Deccan, MALLIK and Shahram,
I want to understand why do we need this? When BFD bootstrapping is
completed then we use local discr (BFD packet your discr) as a key which will
be unique with in the local system. Please take a look at below section of RFC
5880.
https://tools.ietf.org/html/rfc5880#section-6.3
We don’t need to really use any other fields as we would have exchanged the
discr using LSP ping. I might have misunderstood your question and would like
to be corrected.
Thanks
Santosh P K
From: Rtg-bfd [mailto:[email protected]] On Behalf Of
[email protected]<mailto:[email protected]>
Sent: Thursday, July 16, 2015 1:00 PM
To: MALLIK MUDIGONDA (mmudigon)
Cc: [email protected]<mailto:[email protected]>; S. Davari
Subject: 答复: Re: issues about draft-ietf-bfd-rfc5884-clarifications-02
Hi Mallik
Source address is also a good method. But it is better to form as standard.
thanks
"MALLIK MUDIGONDA (mmudigon)" <[email protected]<mailto:[email protected]>>
2015-07-16 下午 02:16
收件人
"S. Davari" <[email protected]<mailto:[email protected]>>,
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
抄送
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
主题
Re: issues about draft-ietf-bfd-rfc5884-clarifications-02
Hi,
I think the question is 2 different ingress LSRs using the same FEC, LSP,
Discriminator values. Discriminator values can be the same for 2 different
ingress LSRs and if the other values are same we can always use the Source
address to differentiate. Am I missing something?
Regards
Mallik
From: "S. Davari" <[email protected]<mailto:[email protected]>>
Date: Wednesday, 15 July 2015 20:12
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Cc: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: Re: issues about draft-ietf-bfd-rfc5884-clarifications-02
Hi
Why can't the ingress allocate different LD to each of those BFD sessions?
Regards,
Shahram
On Jul 15, 2015, at 7:30 AM,
"[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>> wrote:
hi authors
It is neccessary to address the case that different ingress LSR establish BFD
session with the same egress LSR, with same FEC, same local descriminator.
I think it is very useful to introduce a BFD Initiator TLV to LSP ping echo
request message, to distinguish different ingress LSR. So that ingress allocate
LD based on tuple <FEC, LSP> as defined in this draft, but egress allocate LD
based on tuple <Initiator, FEC, RD>.
thanks
deccan
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