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Xuehui, and all,
 
As a matter of fact, FRR is a pure dat= a plane mechanism that can be decoupled from the control plane.
(Of course it means that your bypass t= unnels have to be constructed by the management plane, but this is nothing = to prevent this). As a consequence, FRR is fully accep= table in MPLS-TP.
 
My 2 c,
     Sasha<= /div>
 
From: mpls-bounce= s@ietf.org [mpls-bounces@ietf.org] On Behalf Of dai.xuehui@zte.com.cn [dai.= xuehui@zte.com.cn]
Sent: Friday, August 13, 2010 8:33 AM
To: Autumn Liu
Cc: liu.guoman@zte.com.cn; mpls-bounces@ietf.org; mpls@ietf.org
Subject: [mpls] =B4=F0=B8=B4: Re: Updated drafts - draft-kini-mpls-r= ing-frr-facility-backup, draft-kini-mpls-fast-lsp-alert


Hi all=A3=AC

From my understanding, FRR mechanism i= s based on RSVP-TE protocol, since , if the proposed method be used in MPLS= -TP ,this can only be used when there is a control plane.

 and in the example below, e-back= up tunnel  L10-L1-L2-L3-L4-L5-L6 can only protect LSP1: L10-L9-L8-L7-L6; and for LSP2:= : L10-L1-L2-L3-L4, there should be another e-backup tunnel . and

through the association between the primary= LSP and bypass tunnel ( by RRO object ), once an alert message received fr= om this bypass tunnel , the node can judge which primary LSP needs to be pr= otected.

is my understanding right?

Best regards,

-xuehui



Autumn Liu <au= tumn.liu@ericsson.com>
=B7=A2=BC=FE=C8=CB:  mpls-bounces= @ietf.org

2010-08-05 06:08

=CA=D5=BC=FE=C8= =CB
 "liu.guoman@zte.com.cn" = <liu.guoman@zte.com.cn>
=B3=AD=CB=CD
 "mpls@ietf.org" <mpls= @ietf.org>
=D6=F7=CC=E2
 Re: [mpls] Updated drafts - draft-= kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert





Hi Liu,
 
In your example, the bypass = tunnel only protects the first primary LSP (L10-L9-L8-L7-L6). The proposed = RRO object will be included for this primary LSP only. As a result, the ale= rt message will only trigger this primary to switch over to the e-backup.
 
Regards,
Autumn

From: liu.guoman@zte.com.cn [mailto= :liu.guoman@zte.com.cn]
Sent: Tuesday, August 03, 2010 12:38 AM
To: Autumn Liu
Cc: Greg Mirsky; Julien Meuric; mpls@ietf.org; mpls-bounces@ietf.org=
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: <= /font>
  +-------L1--------L2-----= ----L3--------L4-------+
  |                   &nb= sp;                     &= nbsp;            |
L10                     &= nbsp;                    =        L5
 |                   &nbs= p;                     &n= bsp;            |
+-------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. <= /font>
now if the failure happened between L8 and L7. according to your solution.<= /font>
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 d= on'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 <au= tumn.liu@ericsson.com>
=B7=A2=BC=FE=C8=CB:  mpls-bounces@ietf.org

2010-07-28 06:35


=CA=D5=BC=FE=C8= =CB
 Greg Mirsky <greg= imirsky@gmail.com>, Julien Meuric <julien.meuric@orange-ftgroup.com&g= t;
=B3=AD=CB=CD
 "mpls@ietf.org" <mpls= @ietf.org>
=D6=F7=CC=E2
 Re: [mpls] Updated drafts   &= nbsp;    -        draft-kini-mpls-ring-frr-fa= cility-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 seg= ment protection is utilized as defined in 4873. We will update the draft ac= cordingly.
 
Regards,
Autumn
 
 
From: mpls-bounces@ietf.org [mailto= :mpls-bounces@ietf.org] On Behalf Of Greg Mirsky
Sent: Monday, July 26, 2010 1:37 PM
To: Autumn Liu
Cc: mpls@ietf.org
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-L= 9-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 subobjec= ts 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 <autumn.liu@ericsson.com> wrote:
Hi Greg,
 
+-------L1--------L2---------L3--------L4-------+
|                     &nb= sp;                     &= nbsp;          |
L10                     &= nbsp;                    =        L5
 |                   &nbs= p;                     &n= bsp;            |
+-------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 witho= ut getting traffic u-turned.
 
Regards,
Autumn



From: Greg Mirsky [mailto:gregimirsky@gmail.com]
Sent: Monday, July 26, 2010 12:03 PM
To: Autumn Liu
Cc: Julien Meuric; Sriganesh Kini; mpls@ietf.org

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 LS= P. Please correct me if my understanding is different from authors intentio= n.
I'd like to add to Julien's comment that RFC 4873 seems relevant to your so= lution as well as RFC 4872. And I'd ask the same question as Julien in rega= rd to not referencing RFC 4873.

Regards,
Greg

On Mon, Jul 26, 2010 at 11:30 AM, Autumn Liu <autumn.liu@ericsson.com> wrote:
Hi Julien,

draft-kini-mpls-ring-frr-facility-backup describes a mechanism to let the p= rimary LSP be aware of what the bypass LSP for corresponding protected faci= lity. 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 tryi= ng to address since each link/node along the primary LSP may have different= bypass LSPs.

Regards,
Autumn


-----Original Message-----
From: mpls-bounces@ietf.org [mailto:mpls-b= ounces@ietf.org] On Behalf Of Julien Meuric
Sent: Monday, July 26, 2010 10:40 AM
To: Sriganesh Kini
Cc: mpls@ietf.org
Subject: Re: [mpls] Updated drafts - draft-kini-mpls-ring-frr-facility-back= up, 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 protecti= on), as enabled by RFC 4872. That is all the more similar because the assoc= iation mechanism is already defined in there, with a dedicated RSVP-TE obje= ct. RFC 4872 is Standard Track: is there any rational for not considering it?

Regards,

Julien


Le 26/07/2010 18:59, Sriganesh Kini a =A8=A6crit :
> FYI - These updated version of these drafts were presented today at > IETF78.
> http://tools.ietf.org/html/draft-kini-mpls-ring-frr-facil= ity-backup-01
> http://tools.ietf.org/html/draft-kini-mpls-fast-lsp-alert-01<= /font>
> Thanks
>
> - Sri
>
>
> _______________________________________________
> mpls mailing list
> mpls@ietf.org
> https://= www.ietf.org/mailman/listinfo/mpls
>
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