Example: Configuring Remote Lfa Over Ldp Tunnels In Is-Is Networks - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide

Example: Configuring Remote LFA over LDP Tunnels in IS-IS Networks

Requirements
Overview
568
This example shows how to configure remote LFA for LDP tunnels in an IS-IS network
for extending backup protection.
Requirements on page 568
Overview on page 568
Configuration on page 569
Verification on page 576
This example uses the following hardware and software components:
One ACX5000 router and five other supporting routers with IS-IS protocol and LDP
enabled on the connected interfaces. If the other supporting routers are also ACX5000
routers, then interfaces should be of type
Junos OS Release 15.1X54–D60 running on ACX5000 router.
Junos OS Release 14.2 or later running on other supporting devices.
Before you configure remote LFA over LDP tunnels in IS-IS networks, make sure of the
following:
LDP is enabled on the loopback interface. Without a loopback interface, LDP targeted
adjacency cannot be formed. Remote LFA cannot be configured without LDP targeted
adjacency.
Remote LFA must allow asymmetric remote neighbor discovery—that is, it must send
periodic targeted hello messages to the router that initiated the remote neighbor for
LDP auto targeted adjacency.
Link protection or node-link protection must be configured on the point of local repair
(PLR).
The example includes one ACX5000 router and five other supporting routers in a ring
topology. Configure the IS-IS protocol on the directly connected interfaces. Device R1 is
the ACX5000 router. This example verifies that Junos OS updates the routing table of
Device R1 with LDP next-hop routes as the backup route.
Topology
Figure 29 on page 569 shows the topology used in this example.
instead of as shown in this example.
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