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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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VPN GR

VPN GR

Definition

VPN Graceful Restart (GR) leverages the advantages of GR technology on a VPN to ensure uninterrupted forwarding of VPN traffic when an active/standby switchover is performed on a device transmitting VPN services. VPN GR provides the following benefits:

  • Reduces the impact of route flapping on the entire network during a switchover.

  • Reduces the packet loss ratio of VPN traffic to almost 0%.

  • Reduces the impact on important VPN services.

  • Reduces single-point failures on PE or CE devices to improve VPN network reliability.

Prerequisites for VPN GR

The device on which an active/standby switchover is performed and the devices connected to it must have GR capabilities. That is, the devices must support IGP GR, BGP GR, and LDP GR, and must retain forwarding information of all VPN routes within a period to ensure uninterrupted VPN traffic forwarding.

Implementation

On a common BGP/MPLS VPN network, active/standby switchovers may occur on any PE, CE, or P device.

  • Active/standby switchover on a PE device

    The GR process on a PE device is the same as that on the GR restarter in IGP GR, BGP GR, or LDP GR.

    When a CE device connected to the PE device detects the restart of the PE device, the CE device functions the same as the GR helper in IGP GR or BGP GR and retains all IPv4 routes for a certain period.

    When the P device connected to the PE device detects the restart of the PE device, the P device functions the same as the GR helper in IGP GR, BGP GR, or LDP GR and retains all public IPv4 routes for a certain period.

    When other PE devices (including those functioning as ASBRs) and the RR reflecting VPNv4 routes detect the restart of the PE device, they function the same as the GR helper in BGP GR, and retain all the public IPv4 routes and VPNv4 routes for a certain period.

  • Active/standby switchover on a P device

    The GR process on a P device is the same as that on the GR restarter in IGP GR, BGP GR, or LDP GR.

    When a P or PE device connected to this P device detects the restart, the P or PE device functions the same as the GR helper in IGP GR, BGP GR, or LDP GR and retains all the public IPv4 routes for a certain period.

  • Active/standby switchover on a CE device

    The GR process on a CE device is the same as that on the GR restarter in IGP GR or BGP GR.

    When the PE device connected to the CE device detects the restart of the CE device, the PE device functions the same as the GR helper in IGP GR or BGP GR and retains all the private IPv4 routes in a period.

For details about BGP GR, see "BGP GR and NSR" in the CloudEngine 12800 and 12800E Series Switches Configuration Guide - IP Routing.

For details about LDP GR, see "LDP GR" in the CloudEngine 12800 and 12800E Series Switches Configuration Guide - MPLS.

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Updated: 2019-04-03

Document ID: EDOC1100075353

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