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Configuration Guide - VPN

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of VPN, including GRE, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, and VPLS.
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Configuring VPN GR Helper

Configuring VPN GR Helper

Context

On a VPN, you can configure neighboring devices of the Graceful Restart (GR) restarter as VPN GR helpers. This ensures uninterrupted forwarding of VPN traffic if an active/standby switchover occurs on any of the CE, PE, and P devices.

A GR process involves two roles: GR restarter and GR helper.
  • GR restarter: performs active/standby switchover or system upgrade.
  • GR helper: helps the GR restarter to implement uninterrupted service forwarding.

VPN GR leverages the GR capabilities of various protocols running on devices in a VPN. On neighboring devices of the GR restarter, configure IGP GR helper, MPLS LDP GR helper, or BGP GR helper based on the related protocol running on the GR restarter.

Configure VPN GR on the PE, CE, and P devices as follows:
  • Configure IGP GR helper, MPLS LDP GR helper, or BGP GR helper on the PE device.
  • Configure MPLS LDP GR helper or IGP GR helper on the P device.
  • Configure IGP GR helper or BGP GR helper on the CE device.
  • If a VPN spans multiple ASs, configure IGP GR helper, MPLS LDP GR helper, or BGP GR helper on the ASBR.

Pre-configuration Tasks

Before configuring VPN GR helper, complete the following tasks:

Procedure

  • Configure IS-IS GR helper or OSPF GR helper.

    • IS-IS GR helper is enabled on a device by default.

    • For details about how to configure OSPF GR helper, see Configuring OSPF GR Helper in CloudEngine 12800 and 12800E Series Switches Configuration Guide - IP Routing.

  • Configure BGP GR helper.

    • For details about how to configure BGP GR helper, see Configuring the BGP GR Helper Function in CloudEngine 12800 and 12800E Series Switches Configuration Guide - IP Routing.

  • Configure MPLS LDP GR helper.

    • For details about how to configure MPLS LDP GR helper, see Configuring LDP GR Helper in CloudEngine 12800 and 12800E Series Switches Configuration Guide - MPLS.

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Updated: 2019-04-03

Document ID: EDOC1100075353

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