Configuring VPN GR
In the process of active/standby control board switchover or the system upgrade, you can configure VPN GR to ensure that VPN traffic is not interrupted on the PE, CE, or P device.
Context
- GR restarter: performs active/standby control board switchover or the system upgrade.
- GR helper: helps the GR restarter to implement uninterrupted service forwarding.
NOTE: The AR3260 can function as both the GR restarter and GR helper, and other devices can only function as the GR helper.
VPN GR is the collection of GR capabilities of various protocols running on devices on VPN networks. You need to configure IGP GR, BGP GR, MPLS LDP GR, or MPLS TE GR based on the related protocol running on the GR restarter. You also need to configure neighboring devices of the GR restarter as the GR helper to help the GR restarter implement uninterrupted service forwarding.
- Configure IGP GR, BGP GR and MPLS LDP (or MPLS TE) GR on the PE device.
- Configure IGP GR and the MPLS LDP (or MPLS TE) GR on the P device.
- Configure IGP GR or the BGP GR on the CE device.
- If a VPN spans multiple ASs, you must configure the IGP GR, BGP GR and MPLS LDP GR on the ASBR.
NOTE: The GR capability cannot ensure uninterrupted traffic forwarding when the neighboring device performs an active/standby switchover at the same time.
Pre-configuration Tasks
Before configuring VPN GR, complete the following tasks:
- Configuring Basic BGP/MPLS IP VPN Functions
- Enabling GR Helper on all the devices on the network
Procedure
- Configure IS-IS GR or OSPF GR.
- For details about how to configure IS-IS GR, see section "Enabling IS-IS GR" in Huawei AR Series Access Routers Configuration Guide - IP Routing.
- For details about how to configure OSPF GR, see section "Configuring OSPF GR" in Huawei AR Series Access Routers Configuration Guide - IP Routing.
- Configure BGP GR.
- For details about how to configure BGP GR, see section "Configuring the BGP GR Function" in Huawei AR Series Access Routers Configuration Guide - IP Routing.
- Configure MPLS LDP GR or MPLS TE GR.
- For details about how to configure MPLS LDP GR, see section "Configuring LDP GR" in Huawei AR Series Access Routers Configuration Guide - MPLS.
- For details about how to configure MPLS TE GR, see section "Configuring RSVP GR" in Huawei AR Series Access Routers Configuration Guide - MPLS.
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