[mpls-linux-general] LDP question

[Scott L. <nat...@ya...>]

Hi James,

Can I ask you a question on LDP? If you have the
following topology:

A-----B
|     |
C-----D

From A's perspective, there are two equal cost paths
to D. That means when A receives label mappings from
B and C, it can use the label value learnt from B when
forwarding the packet to D via B and use the label
value learnt from C when forwarding packet to D via C.
Let's assume that A can perform load-balancing based
on source IP address so that you would not get out
of order packets at the final destination.

Question1: Is this supported in LDP?
LDP mentioned somthing like multipath is not supported
in this version. What does that mean?

Question2: In ordered control mode, when A receives
the label mapping from B, does A sends another label
mapping message to C (because the mapping came from
the next hop)? I guess C would not send another
mapping
message to D because the mapping message did not
come from the next hop?

Question3: Does B advertise label for FEC whose next
hop is C to C also? (I think in the ind control mode,
B does and the ordered control mode, B does not.)

Thanks again, James.

Scott

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