RE: issues about draft-ietf-bfd-rfc5884-clarifications-02

[Gregory Mirsky <[e-mail]>]

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:[e-mail]] On Behalf Of MALLIK MUDIGONDA (mmudigon)
Sent: Thursday, July 16, 2015 10:15 PM
To: Santosh P K; S. Davari
Cc: [e-mail]; [e-mail]
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 <[e-mail]<mailto:[e-mail]>>
Date: Friday, 17 July 2015 10:21
To: "S. Davari" <[e-mail]<mailto:[e-mail]>>
Cc: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>, Mallik Mudigonda <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
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:[e-mail]]
Sent: Friday, July 17, 2015 9:51 AM
To: Santosh P K
Cc: [e-mail]<mailto:[e-mail]>; MALLIK MUDIGONDA (mmudigon); [e-mail]<mailto:[e-mail]>
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 <[e-mail]<mailto:[e-mail]>> 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:[e-mail]] On Behalf Of [e-mail]<mailto:[e-mail]>
Sent: Thursday, July 16, 2015 1:00 PM
To: MALLIK MUDIGONDA (mmudigon)
Cc: [e-mail]<mailto:[e-mail]>; S. Davari
Subject: ´ð¸´: 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)" <[e-mail]<mailto:[e-mail]>>

2015-07-16 ÏÂÎç 02:16

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"S. Davari" <[e-mail]<mailto:[e-mail]>>, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>

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"[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>

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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" <[e-mail]<mailto:[e-mail]>>
Date: Wednesday, 15 July 2015 20:12
To: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
Cc: "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>>
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, "[e-mail]<mailto:[e-mail]>" <[e-mail]<mailto:[e-mail]>> 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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