Thanks for addressing most of my comments, and sorry for the delay getting
back to you. There are just a few comments that I want to discuss further.
1. Section 7.9, "Use of Ingress Replication with I-PMSI A-D routes".
The document should make it clear that these procedures are required to
be implemented (by all the PEs of a given MVPN) ONLY under the following
conditions:
- At least one of those PEs is a V-hub or V-spoke PE for the given MVPN.
- The given MVPN is configured to use the optional procedure of using
Ingress Replication to instantiate an I-PMSI.
2. Abstract
I continue to think that the second paragraph of the abstract is
misleading in its claim that "the approach described in this document may
allow to reduce bandwidth inefficiency", given that the approach may also
allow an increase in bandwidth inefficiency. Maybe replace "may" with
"may under certain circumstances".
(I also continue to think that the abstract would be improved if it
mentioned that the draft uses "hub and spoke" procedures to provide
any-to-any service, but that's just a suggestion.)
3. Multi-level hierarchy outside the scope of the document
When I pointed out that the procedures don't appear to generalize easily
to support of a multi-level hierarchy, you replied "multi-level hierarchy
is outside the scope of this document". That's fine, but the document
should have a statement to that effect.
4. Installation of default route in a V-hub VRF
I'm still having trouble understanding the point of the following
paragraph:
When a V-hub of a given VPN originates a VPN-IP default route for
that VPN, the V-hub MUST NOT install in its VRF of that VPN a
default route, unless this route has been originated either (a) as a
result of the V-hub receiving an IP default route from one of the
CEs of that VPN connected to it, or (b) as a result of the V-hub
receiving (and importing) a VPN-IP default route from some other PE,
or (c) the VRF being provisioned with a default route pointing to
the routing table on the same PE that maintains the Internet routes.
Could you give an example to show that this restriction is necessary?
5. E/IBGP Load Balancing at a V-hub for packets whose label corresponds to
the VPN-IP default route.
This is an optimization that may be useful under certain circumstances,
but not others. The draft should make it clear that this behavior is
optional.
