Re: [mpls] New Version Notification for draft-kompella-mpls-larp-02.txt

Hi Bhupesh,

> On Oct 30, 2014, at 14:02 , Bhupesh Kothari <bhupesh@anvaya.net> wrote:
> 
> Hi Kireeti,
> 
> Can you describe how L-ARP can be used between a DSLAM and its upstream router to form bi-directional tunnels?  I want to understand what, if any, assumptions are made.

L-ARP is for the DSLAM (or server, or whatever) to talk to a BNG (or remote server).  For the reverse direction, one possibility is “labeled DHCP”.  A quick overview is that when a DSLAM X asks for an IP address, it also says, allocate a label for me.  The upstream node (switch/BNG/CMTS) Y then allocates a label, which it advertises to reach X.  That would establish bidirectional connectivity.

To establish hierarchical tunnels, I would recommend L-BGP (RFC 3107).  Two possibilities: The X announces this label (with next hop Y); or Y announces this label with itself as next hop.  In the former case, the L-DHCP reply needs to have a label for X to advertise.

If this makes sense (and interests you), I’d be happy to collaborate with you on the L-DHCP draft.

Kireeti.

> Bhupesh
> 
> 
> On Wed, Oct 29, 2014 at 10:36 AM, Kireeti Kompella <kireeti.kompella@gmail.com <mailto:kireeti.kompella@gmail.com>> wrote:
> Hi All,
> 
> Not sure why this didn't get copied to the MPLS WG list.
> 
> In any case, this update breaks out the "Hardware Address" into two parts.  The HA part contains just the MAC address of L-ARP replier.  Labels are in a separate TLV that now can contain a label stack.  Finally, the metric is taken out of the HA part and is separate.
> 
> We also have a new co-author, George Swallow.
> 
> Please comment on the draft as a whole, and on these changes in particular.
> 
> Thanks,
> Kireeti.
> 
> ---------- Forwarded message ----------
> From: <internet-drafts@ietf.org <mailto:internet-drafts@ietf.org>>
> Date: Mon, Oct 27, 2014 at 4:12 PM
> Subject: New Version Notification for draft-kompella-mpls-larp-02.txt
> To: Kireeti Kompella <kireeti.kompella@gmail.com <mailto:kireeti.kompella@gmail.com>>, George Swallow <swallow@cisco.com <mailto:swallow@cisco.com>>, Balaji Rajagopalan <balajir@juniper.net <mailto:balajir@juniper.net>>
> 
> 
> 
> A new version of I-D, draft-kompella-mpls-larp-02.txt
> has been successfully submitted by Kireeti Kompella and posted to the
> IETF repository.
> 
> Name:           draft-kompella-mpls-larp
> Revision:       02
> Title:          Label Distribution Using ARP
> Document date:  2014-10-27
> Group:          Individual Submission
> Pages:          11
> URL:            http://www.ietf.org/internet-drafts/draft-kompella-mpls-larp-02.txt <http://www.ietf.org/internet-drafts/draft-kompella-mpls-larp-02.txt>
> Status:         https://datatracker.ietf.org/doc/draft-kompella-mpls-larp/ <https://datatracker.ietf.org/doc/draft-kompella-mpls-larp/>
> Htmlized:       http://tools.ietf.org/html/draft-kompella-mpls-larp-02 <http://tools.ietf.org/html/draft-kompella-mpls-larp-02>
> Diff:           http://www.ietf.org/rfcdiff?url2=draft-kompella-mpls-larp-02 <http://www.ietf.org/rfcdiff?url2=draft-kompella-mpls-larp-02>
> 
> Abstract:
>    This document describes extensions to the Address Resolution Protocol
>    to distribute MPLS labels for IPv4 and IPv6 host addresses.
>    Distribution of labels via ARP enables simple plug-and-play operation
>    of MPLS, which is a key goal of the MPLS Fabric architecture.
> 
> 
> 
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org <http://tools.ietf.org/>.
> 
> The IETF Secretariat
> 
> 
> 
> 
> -- 
> Kireeti
> 
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