Re: [mpls] Updated drafts - draft-kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert

[Sriganesh Kini <[e-mail]>]

Liu,

Alert message is used to notify at the time of failure. The association of
protected LSP to backup and e-backup tunnel is done prior to failure. A
single alert message (right after failure) per backup tunnel is sufficient
(though a couple duplicates may be sent to protect against packet loss). It
is important to note that the alert message is not per protected LSP.

2010/8/3 <[e-mail]>

>
> sri
> thank you for replying , but I don't completely understand your opinions.
> whether each LSP has a specific alert message to notify source node of its
> relative e-backup tunnel. for example, if the LSP L10......L6 have the
> failure,
> node L10 will receive a alert message of LSP L10.....L6,
> in addtion, if the LSP L10......L4 have the failure,
> node L10 will receive another alert message of LSP L10.....L4?
>
> can my understanding be true?
>
> best regards
> liu
>
>
>
>
>  *Sriganesh Kini <[e-mail]>*
> 发件人:  [e-mail]
>
> 2010-08-03 17:53
>   收件人
> "[e-mail]" <[e-mail]>, Autumn Liu <
> [e-mail]>
> 抄送
> "[e-mail]" <[e-mail]>, "[e-mail]" <
> [e-mail]>
> 主题
> Re: [mpls] Updated drafts        -
>  draft-kini-mpls-ring-frr-facility-backup,
>  draft-kini-mpls-fast-lsp-alert
>
>
>
>
> Liu,
>
> The LSP L10-...-L6 would advertise in its RRO that e-backup
> L10-...-L3-...-L6 is protecting it. However, the LSP L10-...-L6 does not
> indicate that. So L10 knows apriori that an alert message on that specific
> e-backup tunnel should trigger a protection switch from L10-...-L6 to the
> e-backup (whereas it should not for the other LSP).
>
> - Sri
> ________________________________
> From: [e-mail] [[e-mail]] On Behalf Of
> [e-mail] [[e-mail]]
> Sent: Tuesday, August 03, 2010 12:38 AM
> To: Autumn Liu
> Cc: [e-mail]; [e-mail]
> Subject: Re: [mpls] Updated drafts -
> draft-kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert
>
>
> hi,Autumn
> here I only ask a question for this E-FRR solution.
> for example as the following:
>   +-------L1--------L2---------L3--------L4-------+
>   |                                                      |
> L10                                                  L5
>  |                                                      |
> +-------L9--------L8---------L7--------L6-------+
> we suppose there are two working LSP , One LSP: L10-L9-L8-L7-L6,
> another LSP: L10-L1-L2-L3-L4.
> now if the failure happened between L8 and L7. according to your solution.
> L8 and L7 would send fast alert message to each node of bypass Tunnel
> : L8-L9-L10-L1-L2-L3-L4-L5-L6-L7;
> when node L10 received fast alert message from L8 or L7, for working LSP:
> L10-L9-L8-L7-L6, will swich into e-backup tunnel: L10-L1-L2-L3-L4-L5-L6;
> while for another LSP: L10-L1-L2-L3-L4 , how  do it know the failure don't
> affect the working LSP and can't need to switch into e-backup tunnel?
> whether there is include LSP ID information which will be affected by
> the failure in the fast alert message packet? or the solution will adapt
> new method to judge which LSP will be affected by the failure?
>
> maybe my understanding be wrong?
>
> best regards
> liu
>
>
>
>
>
>
>
>
> Autumn Liu <[e-mail]>
> 发件人:  [e-mail]
>
> 2010-07-28 06:35
>
>
> 收件人
>        Greg Mirsky <[e-mail]>, Julien Meuric <
> [e-mail]>
> 抄送
>        "[e-mail]" <[e-mail]>
> 主题
>        Re: [mpls] Updated drafts        -
>  draft-kini-mpls-ring-frr-facility-backup,
>  draft-kini-mpls-fast-lsp-alert
>
>
>
>
>
>
>
> Hi Greg and Julien
>
> Thanks for pointing this out. The draft can be applied to the case when
> segment protection is utilized as defined in 4873. We will update the draft
> accordingly.
>
> Regards,
> Autumn
>
>
>
> ________________________________
> From: [e-mail] [mailto:[e-mail]] On Behalf Of
> Greg Mirsky
> Sent: Monday, July 26, 2010 1:37 PM
> To: Autumn Liu
> Cc: [e-mail]
> Subject: Re: [mpls] Updated drafts -
> draft-kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert
>
> Dear Autumn,
> thank you for adding specific case to our discussion. In my view protecting
> segment L10-L1-L2-L3-L4-L5 (e-backup tunnel) is shared by all backup tunnels
> that traverse the ring through nodes L10-L9-L8-L7-L6-L5. This e-backup
> tunnel is the e-backup tunnels for all working sections/segments (in case of
> link and node protection) of an LSP L10-...-L8-..-L5. I'd re-state my
> question to authors whether they've considered re-using RSVP-TE objects and
> subobjects defined in RFC 4873.  If mechanisms and objects defined in RFC
> 4873 not sufficient, why RFC 4873 not referenced in the draft Efficient
> Facility Backup FRR.
>
> Regards,
> Greg
>
> On Mon, Jul 26, 2010 at 12:16 PM, Autumn Liu <[e-mail]
> <mailto:[e-mail]>> wrote:
> Hi Greg,
>
> +-------L1--------L2---------L3--------L4-------+
> |                                                      |
> L10                                                  L5
>  |                                                      |
> +-------L9--------L8---------L7--------L6-------+
>
> Not all PLRs. Using the diagram in draft as an example.
> Bypass 1 (to protect link between L8 and L7) :
> L8-L9-L10-L1-L2-L3-L4-L5-L6-L7
> Bypass 2 (to protect node failure on L8) : L9-L10-L1-L2-L3-L4-L5-L6-L7
>
> e-backup tunnel L10-L1-L2-L3-L4-L5 can be used instead for both cases
> without getting traffic u-turned.
>
> Regards,
> Autumn
>
>
>
> ________________________________
> From: Greg Mirsky [mailto:[e-mail]<mailto:
> [e-mail]>]
> Sent: Monday, July 26, 2010 12:03 PM
> To: Autumn Liu
> Cc: Julien Meuric; Sriganesh Kini; [e-mail]<mailto:[e-mail]>
>
> Subject: Re: [mpls] Updated drafts -
> draft-kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert
>
> Dear Autumn,
> I'm quite surprised to read your reply to Julien. My understanding of your
> proposal is that all PLRs share the same u-PLR for given ring segment of
> LSP. Please correct me if my understanding is different from authors
> intention.
> I'd like to add to Julien's comment that RFC 4873 seems relevant to your
> solution as well as RFC 4872. And I'd ask the same question as Julien in
> regard to not referencing RFC 4873.
>
> Regards,
> Greg
>
> On Mon, Jul 26, 2010 at 11:30 AM, Autumn Liu <[e-mail]
> <mailto:[e-mail]>> wrote:
> Hi Julien,
>
> draft-kini-mpls-ring-frr-facility-backup describes a mechanism to let the
> primary LSP be aware of what the bypass LSP for corresponding protected
> facility. If my understanding is correct, the association mechanism defined
> in 4872 is used to associate the primary and backup LSPs. This is not good
> enough for the problem the draft is trying to address since each link/node
> along the primary LSP may have different bypass LSPs.
>
> Regards,
> Autumn
>
>
> -----Original Message-----
> From: [e-mail]<mailto:[e-mail]> [mailto:
> [e-mail]<mailto:[e-mail]>] On Behalf Of Julien
> Meuric
> Sent: Monday, July 26, 2010 10:40 AM
> To: Sriganesh Kini
> Cc: [e-mail]<mailto:[e-mail]>
> Subject: Re: [mpls] Updated drafts -
> draft-kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert
>
> Hi Sriganesh.
>
> The mechanism described in draft-kini-mpls-ring-frr-facility-backup
> reminds me of end to end recovery (or more specifically end to end
> protection), as enabled by RFC 4872. That is all the more similar because
> the association mechanism is already defined in there, with a dedicated
> RSVP-TE object. RFC 4872 is Standard Track: is there any rational for not
> considering it?
>
> Regards,
>
> Julien
>
>
> Le 26/07/2010 18:59, Sriganesh Kini a écrit :
> > FYI - These updated version of these drafts were presented today at
> > IETF78.
> > http://tools.ietf.org/html/draft-kini-mpls-ring-frr-facility-backup-01
> > http://tools.ietf.org/html/draft-kini-mpls-fast-lsp-alert-01
> > Thanks
> >
> > - Sri
> >
> >
> > _______________________________________________
> > mpls mailing list
> > [e-mail]<mailto:[e-mail]>
> > https://www.ietf.org/mailman/listinfo/mpls
> >
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-- 
- Sri