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

[[e-mail]]

Autumn
thank you for explaining. according to my understanding, when one link 
have failure, PLR node will append to the PRO of per LSP which have been 
affected by the failure in the 
BFD Session of backup tunnel, so that PLR-u will know which LSP need to 
switch its own e-backup tunnel? if so , as PLR may be MIP of some LSP , 
how do it know PRO of per LSP?
can you need to query the PRO of per LSP by control plane?
in addtion, for P2MP , when U-PLR received alert message from PLR , U-PLR 
should make service packet bridge both primary LSP and e-backup tunnel at 
the same time. it is very rapid and
valid solution. do you think so? 
if you can be interested in the p2mp protection solution, we may disscuss 
it in detail in the following time.

best regards
liu







Autumn Liu <[e-mail]> 
2010-08-04 10:35

收件人
"[e-mail]" <[e-mail]>, Sriganesh Kini 
<[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 proposed RRO subject tells u-PLR of primary LSP which backup is 
protecting it. When the alert message is received on that backup, the 
u-PLR finds out the primary LSP (protected by the backup) to switch the 
traffic onto the e-backup.
 
Hope this gives you the clear answer to your question.
 
Autumn
 
 

From: [e-mail] [mailto:[e-mail]] 
Sent: Tuesday, August 03, 2010 6:14 PM
To: Sriganesh Kini
Cc: Autumn Liu; [e-mail]; [e-mail]
Subject: Re: [mpls] Updated drafts - 
draft-kini-mpls-ring-frr-facility-backup, draft-kini-mpls-fast-lsp-alert


Sri 
maybe i not clarify my problem?  my key problem is how do u-PLR know which 
LSP will be affected by the failure after receiving an alert message? 
can U-PLR  apperceive which LSP have the failure? or can PLR tell u-PLR 
about which LSP will have the failure by an alert message? 

I hope you can provide a clear answer. 

best regards 
liu






Sriganesh Kini <[e-mail]> 
发件人:  [e-mail] 
2010-08-04 03:06 


收件人
[e-mail] 
抄送
"[e-mail]" <[e-mail]>, Autumn Liu <[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, 

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 


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"[e-mail]" <[e-mail]>, Autumn Liu <
[e-mail]> 
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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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