Configuring Remote Lfa Backup Over Ldp Tunnels In An Is-Is Network - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Configuring Remote LFA Backup over LDP Tunnels in an IS-IS Network

566
of spoofed extended hellos by filtering them and accepting only those originating at
sources permitted by an access or filter list.
There is a need to authenticate with TCP-MD5 all auto-targeted LDP sessions in the
given IGP/LDP domain using apply groups or LDP global-level authentication.
As an added security measure, the repair or remote tunnel endpoint routers should be
assigned from a set of addresses that are not reachable from outside of the routing
domain.
auto-targeted-session
no-eligible-remote-backup
remote-backup-calculation
Configuring Remote LFA Backup over LDP Tunnels in an IS-IS Network on page 566
Example: Configuring Remote LFA over LDP Tunnels in IS-IS Networks
Starting in Junos OS Release 14.2, the primary goal of a remote loop-free alternate (LFA)
is to increase backup coverage for IS-IS routes and provide protection especially for Layer
1 metro-rings. The existing LDP implemented for the MPLS tunnel setup can be reused
for protection of IS-IS networks and subsequent LDP destinations. The IS-IS protocol
creates a dynamic LDP tunnel to reach the remote LFA node from the point of local repair
(PLR). The PLR uses this remote LFA backup path when the primary link fails.
Before you configure remote LFA over LDP tunnels in an IS-IS network, you must do the
following:
Enable LDP on the loopback interface.
1.
Configure a loopback interface because an LDP targeted adjacency cannot be formed
without a loopback interface. LDP targeted adjacency is essential for determining
remote LFA backup paths.
Make sure that remote LFA allows asymmetric remote neighbor discovery—that is, it
2.
must send periodic targeted hello messages to the router that initiated the remote
neighbor for LDP auto-targeted adjacency.
Configure link protection or node-link protection on the PLR.
3.
To configure remote LFA backup over LDP tunnels in an IS-IS network:
Enable remote LFA backup to determine the backup next hop using dynamic LDP
1.
label-switched path.
[edit protocols isis backup-spf-options]
user@host# set remote-backup-calculation
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