The MPLS WG Archive

[Ajay Simha <asimha@cisco.com>]

On Wed, 12 Dec 2001, Michael W. Maszczak wrote:

Michael,

I can help you.  In future please post such Cisco specific questions to
mpls-deployment@cisco.com and not here.

-ajay
MWM>Hello,
MWM>I am trying to understand what conditions are necessary
MWM>for a cisco router to send an LDP Label request message.
MWM>I am running ios 12.2.
MWM>
MWM>Here is my configuration:
MWM>LDP emulator connected to 3640 ethernet A
MWM>LDP emulator connected to 3640 ethernet B
MWM>LDP and MPLS IP enabled on both interfaces.
MWM>The LDP emulators do not emulate any routing
MWM>protocols..
MWM>I have a static route configured:
MWM>ip route 9.9.9.0 255.255.255.0 LDP_Emulator_B_IP_Address
MWM>
MWM>I start both emulators. LDP sessions are established.
MWM>The emulators and 3640 exchange LDP Initialization
MWM>messages and Address messages. When downstream unsolicited
MWM>advertisement mode is set, the 3640 sends label mapping messages
MWM>to each ldp emulator and does not when downstream on demand is set.
MWM>
MWM>Here is my problem:
MWM>Next LDP emulator A  sends a Label Request message with
MWM>FEC TLV containing 9.9.9.0 and prefix length 24.
MWM>The 3640 responds to LDP emulator A with a label mapping message
MWM>containing label 24, the 3640's inbound lable for this FEC.
MWM>However, the 3640 does not send a Label Request
MWM>message to LDP emulator B to obtain the outbound label for this FEC.
MWM>I expect that it would due to the static route configured.
MWM>Why not? I've tried every DU, DOD and independent/order control
MWM>mode possible.
MWM>
MWM>Can anyone help?
MWM>
MWM>Thanks,
MWM>Mike Maszczak
MWM>

-- 
Ajay Simha
MPLS Deployment Engineer
IOS Technology Division
(919) 392-3141

"Study as if you were to live forever
 Live as if you were to die tomorrow"

 - Mahatma Gandhi