RE: Comments on draft-jounay-pwe3-leaf-initiated-p2mp-pw-01

Hi, Frederic,

I have read draft-jounay-pwe3-leaf-initiated-p2mp-pw-01 and have some comments. please see below:

1、section 5.4. Configuration

After configuring on each T-PE the attached AIIs, it is assumed that
all the PEs (Ingress/Egress T-PEs and all S-PEs) maintain an AII PW
routing table which gives for each AII as entry the "next hop" to
reach that AII. This AII routing table can be filled manually or
updated dynamically by means of some extended routing protocol like
proposed in [DYN MS-PW]. The construction of the table is out of
scope of the present document.

Each PE relies on its AII PW routing table to select the next hop PE
(S-PE or T-PE) to reach a given AII.

>1 Does this AII routing table include both TAII and SAII?

[FJ] Yes, the AII routing table dynamically populated (BGP, OSPF, IS-IS or LDP) should maintain both. The Egress T-PE joins the PW tree by initiating a Label Map whose the FEC contains the SAII, the PW tree source. Hence upon receipt of the message the S-PE does a lookup to select the NH to reach this SAII.
>2 In S-PE, this AII routing table includes all the AII, or just part of the AII( e.g. which are in its dowstream)?
[FJ] the AII routing table should be used also for VPWS or VPLS, so bidirectional PW. Therefore the AII routing table must reflect all the AII configured on T-PEs. Of course agregate AII format (i.e. w/o ACID info) as defined in [DYN MS-PW] must be used to optimize the AII routing table

2、Section 5.7. Using TAII Leaf Sub-TLV

Section TBD

The TAII Leaf sub-TLV MAY be optionally used when a leaf joins the PW
tree to announce to the source that it is part from the PW tree. If
this option is chosen, the Egress T-PE adds to the FEC Element this
TAII sub-TLV in the Label Map message. As soon as in the source
direction a Label Map is not required since for instance a S-PE
already maintains a state for this MS-PW tree, the information
related to the Leaf TAIIs is retrieved from the TAII Leaf sub-TLV and
is propagated by means of a LDP Notification message up to the
corresponding Ingress T-PE.
> I am not sure about the propagation of TAII Leaf sub-TLV. Is it sent to ingress T-PE directly, or to the upstream S-PE(if there exists such S-PE in the upstream direction)?