The MPLS WG Archive

["Michael W. Maszczak" <mmaszcza@telcordia.com>]

Hello,
I am trying to understand what conditions are necessary
for a cisco router to send an LDP Label request message.
I am running ios 12.2.

Here is my configuration:
LDP emulator connected to 3640 ethernet A
LDP emulator connected to 3640 ethernet B
LDP and MPLS IP enabled on both interfaces.
The LDP emulators do not emulate any routing
protocols..
I have a static route configured:
ip route 9.9.9.0 255.255.255.0 LDP_Emulator_B_IP_Address

I start both emulators. LDP sessions are established.
The emulators and 3640 exchange LDP Initialization
messages and Address messages. When downstream unsolicited
advertisement mode is set, the 3640 sends label mapping messages
to each ldp emulator and does not when downstream on demand is set.

Here is my problem:
Next LDP emulator A  sends a Label Request message with
FEC TLV containing 9.9.9.0 and prefix length 24.
The 3640 responds to LDP emulator A with a label mapping message
containing label 24, the 3640's inbound lable for this FEC.
However, the 3640 does not send a Label Request
message to LDP emulator B to obtain the outbound label for this FEC.
I expect that it would due to the static route configured.
Why not? I've tried every DU, DOD and independent/order control
mode possible.

Can anyone help?

Thanks,
Mike Maszczak