[c-nsp] IOS XR and router rib rump always-replicate

[Mark Tinka]

On Wednesday, March 06, 2013 10:35:33 AM Mattias Gyllenvarg 
wrote:

> That is why I addressed Oliver directly. I had a
> discussion with him at Cisco Live and this came up.
> 
> The idea is too use MPLS/BGP for transport/signaling. So,
> no PIM on core/dist links. Only toward Customers and
> Peers.

This isn't new.

Juniper have supported it since Junos 8.5 (although it was 
really properly usable in Junos 10.4, to be honest).

ALU have also been supporting it in recent year, although I 
have no ALU experience.

We started beating up Cisco to provide support for this back 
in 2009, since we operated a dual vendor network and didn't 
want Juniper to have too much power over us (one of the 
reasons we didn't buy the ASR9000's for a long time).

Cisco have always had mLDP for some time, but it wasn't NG-
MVPN style. Things have come a very long way since then, and 
support for full NG-MVPN, using BGP C-multicast and p2mp 
RSVP-TE or mLDP is coming online across various Cisco 
platforms (looking forward to the ME3600X/3800X getting it).

IOX XR has had p2mp RSVP-TE support for a little while, 
though, which is why a CRS in the core and Juniper's at the 
edge of an NG-MVPN network works fine!

Juniper have supported p2mp mLDP for a while now as well.

> I do'nt have the details as we have not yet looked into
> implementing but, as Gert pointed out, we some times
> experience the same issue. That PIM is forgotten because
> it is the odd protocol that no one uses except on the
> node that your doing disaster recovery on. So, where as
> always looking for the "Keep it simple, stupid" version.

NG-MVPN is certainly very simple; provided you run an MPLS 
network.

In Juniper M-/T-series routers that require Tunnel or MS-
PIC's to support PIM, you can imagine the nightmare if you 
had a core with these boxes. A PIM-free core makes your life 
quite easy, in this regard.

Mark.
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