- play_arrow Overview
- play_arrow Introduction to IS-IS
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- play_arrow Monitoring and Troubleshooting Network Issues
- play_arrow Monitoring Networks
- play_arrow Troubleshooting Network Issues
- Working with Problems on Your Network
- Isolating a Broken Network Connection
- Identifying the Symptoms of a Broken Network Connection
- Isolating the Causes of a Network Problem
- Taking Appropriate Action for Resolving the Network Problem
- Evaluating the Solution to Check Whether the Network Problem Is Resolved
- play_arrow Troubleshooting IS-IS
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- play_arrow Configuration Statements and Operational Commands
Configuring Remote LFA Backup over LDP Tunnels in an IS-IS Network
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.
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 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.
To configure remote LFA backup over LDP tunnels in an IS-IS network:
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