MPLSVPN troubleshooting skills

Welcome to the network technology community forum, and interact with 2 million technical staff to enter the MPLSVPN fault. Will the backup Tunnel path failure cause MPLSTETunnelhot-standy to never take effect? This problem is really a headache. How can we solve it? Let's take a look at the following tips. The network environment is MPLSVPN. Build a TE tunnel from PE1

Welcome to the network technology community forum and interact with 2 million technical staff> when an mpls vpn fault occurs, why does the mpls te Tunnel hot-standy always fail due to the standby Tunnel path failure? This problem is really a headache. How can we solve it? Let's take a look at the following tips. The network environment is an mpls vpn network. Build a TE tunnel from PE1

Welcome to the network technology community forum and interact with 2 million technical staff> enter

MPLS VPNDuring the fault, the Standby Tunnel path failure causes mpls te Tunnel hot-standy to always fail? This problem is really a headache. How can we solve it? Let's take a look at the following tips.

Network Environment

Is an mpls vpn network. Create a TE tunnel from PE1 with the destination address PE2 and configureHot Backup(Hot-standby ). Where:

The main path is PE1 --> P1 --> PE2;

The backup path is PE1 --> P2 --> PE2;

When the main path fails, the traffic should be promptly switched to the backup path. However, in this case, the entire network is interrupted when a fault occurs, that is, hot backup does not play a role.

Hot Backup networking

Fault Analysis

After the hot backup function is configured, the master path of TE tunnel (in this example, PE1 --> P1 --> PE2) is manually specified, then, a backup path (PE1 --> P2 --> PE2) is automatically calculated. When the master uses LSP to disconnect, traffic is forwarded using the backup path. After troubleshooting, when a link in the primary path fails, all traffic has indeed been switched to the standby path, but a link in the standby path also fails, and all the two paths are interrupted. Therefore, TE tunnel is displayed as down. In the future, although the faulty link in the standby path is restored, the TE tunnel has been down and needs to be restored manually, resulting in service interruption.

Procedure

Recover the faulty link in the Active Directory.

When the TE tunnel status changes to up, the fault is ruled out.

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Case Summary

When troubleshooting mpls vpn network faults, pay attention to the network problems caused by both the active and standby Tunnel faults.