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Re: [mpls] [CCAMP] New Draft Notification: draft-dong-ccamp-rsvp-te-plr-designation-00

Jie Dong <dongjie_dj@huawei.com> Fri, 05 March 2010 08:19 UTC

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Date: Fri, 05 Mar 2010 16:19:10 +0800
From: Jie Dong <dongjie_dj@huawei.com>
In-reply-to: <7c923b5e1003040812g6e3dec6bh3598a4427be16116@mail.gmail.com>
To: 'Francesco Fondelli' <francesco.fondelli@gmail.com>, lberger@labn.net
Message-id: <06f501cabc3c$88881600$bf0c6f0a@china.huawei.com>
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Cc: mpls@ietf.org, ccamp@ietf.org
Subject: Re: [mpls] [CCAMP] New Draft Notification: draft-dong-ccamp-rsvp-te-plr-designation-00
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Hi Francesco, Lou, 

Thanks for your comments and information.

> Didn't RFC 4873 already "allow (a) the signaling of desired 
> LSP segment protection type, (b) upstream nodes to optionally 
> identify where segment protection starts and stops, (c) the 
> optional identification of hops used on protection segments, 
> and (d) the reporting of paths used to protect an LSP."?

RFC 4873 provides a way for GMPLS to explicitly control segment recovery.
But the mechanism in rfc4873 may be a bit complex for fast reroute in packet
switch networks. And I am not sure if currently most routers have
implemented this.

This draft is a simple and backward compatible extension to TE FRR defined
in RFC 4090, and the benefit is similar to RFC4873.

> I believe you can setup and explicitly control backup LSPs if 
> you follow RFC 4873 *and* RFC 4090... I've never done it, though.

For a implementation which support both of this, maybe we can. But  this
draft may still be helpful in environments where only rfc4090 is
implemented.


Best regards,
Jie
 

> -----Original Message-----
> From: Francesco Fondelli [mailto:francesco.fondelli@gmail.com] 
> Sent: Friday, March 05, 2010 12:12 AM
> To: JP Vasseur
> Cc: Jie Dong; mpls@ietf.org; ccamp@ietf.org
> Subject: Re: [CCAMP] New Draft Notification: 
> draft-dong-ccamp-rsvp-te-plr-designation-00
> 
> On Thu, Mar 4, 2010 at 3:46 PM, JP Vasseur <jvasseur@cisco.com> wrote:
> > Dear Jie,
> > Second and third arguments: If there is not enough backup bandwidth 
> > for
> [cut]
> 
> fourth argument:
> 

> 

> 
> Ciao
> FF
>

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