2.13.4 Example for Configuring LDP to Automatically Trigger a
Request in DoD Mode
This section provides an example for configuring LDP to automatically trigger a request in DoD
mode. The procedure consists of enabling global MPLS and MPLS LDP and configuring the
label advertisement mode as DoD.
Networking Requirements
As shown in Figure 2-9, LSRA and LSRD are at the edge of a network. To set up a PW, a remote
LDP session must be set up between LSRA and LSRD to set up a public network tunnel. As the
network is of large scale, to save the network resources, you need to configure LDP to
automatically trigger a request to a downstream node for a label mapping message associated
with a remote LDP peer in DoD mode. In this manner, you can reduce unnecessary IP and MPLS
entries.
Figure 2-9 Networking diagram of configuring LDP to automatically trigger the request in DoD
mode
L S R B
G E 1 /0 /0
10.1.1 .1 /2 4
G E 1 /0 /0
10.1.1 .2 /2 4
L S R A
L S R C
G E 2 /0/0
10 .1.2 .1 /2 4
Lo o p b a c k0
1.1.1 .1 /32
Lo o p b a c k0
2.2 .2 .2/3 2
Lo o p b a c k0
3.3.3 .3 /32
G E 1 /0/0
10 .1.3 .2 /2 4
L S R D
G E 1 /0 /0
10.1.2 .2 /2 4
G E 2 /0/0
10.1 .3 .1 /24
Lo o p b a c k0
4.4.4 .4 /32
Configuration Roadmap
The configuration roadmap is as follows:
1. Assign an IP address to each interface of each node and configure the loopback address
that is used as the LSR ID.
2. Configure basic IS-IS functions on each backbone network device and a static route to the
neighbor of each edge device.
3. Enable global and interface-based MPLS and MPLS LDP on each node.
4. Configure the DoD label distribution mode.
5. Configure LDP extension for inter-area LSP.
6. Configure a remote LDP session and enable the function of automatically triggering a
request to a downstream node for a label mapping message associated with a remote LDP
peer in DoD mode.
Data Preparation
To complete the configuration, you need the following data:
l IP address of an interface on each node as shown in Figure 2-9
l IS-IS level on each node
Huawei AR1200 Series Enterprise Routers
Configuration Guide - MPLS 2 MPLS LDP Configuration
Issue 01 (2011-12-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
84
To Next Page
Loading...
