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Configuration Guide - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - VPN
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Configuring IPv6 Route Iteration to VPN Remote Cross Routes

Configuring IPv6 Route Iteration to VPN Remote Cross Routes

After IPv6 route iteration to VPN remote cross routes is enabled, the labels and Tunnel IDs of the VPN remote cross routes can be inherited, which ensures correct traffic forwarding.

Usage Scenario

A route needs to be iterated if its next hop is unreachable. To allow IPv6 routes to be iterated to VPN remote cross routes, run the ipv6 route recursive-lookup inherit-label-route enable command. After the command is run, IPv6 routes inherit the labels and Tunnel IDs of the VPN remote cross routes, which ensures correct traffic forwarding. This command mainly applies to BGP/MPLS IPv6 VPN scenarios.

In Figure 6-14, PE1 and PE2 are IBGP peers, and CE1 and PE1 are IGP neighbors. PE2 learns the IP address of CE1's loopback interface, and an EBGP peer relationship is established between CE1 and PE2 using loopback interface IP addresses. By default, the BGP routes that PE2 learns from CE1 through the EBGP peer connection cannot be iterated to VPN remote cross routes. As a result, traffic fails to be forwarded. To address this problem, run the ipv6 route recursive-lookup inherit-label-route enable command to allow the BGP4+ routes to be iterated to VPN remote cross routes. After the BGP4+ routes inherit the labels and Tunnel IDs of the VPN remote cross routes, traffic can be correctly forwarded.

Figure 6-14 Basic BGP/MPLS IPv6 VPN networking

Pre-configuration Tasks

Before configuring IPv6 route iteration to VPN remote cross routes, configure basic BGP/MPLS IPv6 VPN.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run ipv6 route recursive-lookup inherit-label-route enable

    Iteration of all IPv6 routes to VPN remote cross routes is enabled.

    By default, IPv6 routes cannot be iterated to VPN remote cross routes.

  3. Run:

    commit

    The configuration is committed.

Checking the Configurations

Run the display current-configuration command in the system view to check whether IPv6 route iteration to VPN remote cross routes is enabled.

<HUAWEI> display current-configuration
#
ipv6 route recursive-lookup inherit-label-route enable
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Updated: 2019-01-14

Document ID: EDOC1100058925

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