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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+VPNv6 Hybrid FRR

Configuring IPv6+VPNv6 Hybrid FRR

This section describes how to configure IPv6+VPNv6 hybrid FRR in the CE dual-homing networking. If the next hop from a PE to a CE is unreachable, IPv6+VPNv6 hybrid FRR can send traffic to the other PE over a tunnel, and the traffic will be routed to the CE through IP forwarding on the private network. This improves network reliability.

Usage Scenario

IPv6+VPNv6 hybrid FRR can quickly switch traffic from a PE to another PE that serves as the backup next hop if the primary route to a CE is unreachable.

A PE learns IPv6 VPN routes with the same prefix from a CE and other PEs. In this situation, IPv6+VPNv6 hybrid FRR can be configured on the PE. After IPv6+VPNv6 hybrid FRR is enabled, the PE generates a primary route and a backup route to the VPN prefix. If the link between the PE and CE fails, the traffic can be quickly switched to the backup next hop (another PE).

The NE supports two IPv6+VPNv6 hybrid FRR modes:

  • IPv6 FRR: applies to the networking where a non-BGP routing protocol runs between the PEs and CE.

  • Private network BGP auto FRR: applies to the networking where BGP runs between the PEs and CE.

Pre-configuration Tasks

Before configuring hybrid FRR for IPv6 and VPNv6 routes, complete the following tasks:

  • Configure a BGP/MPLS IPv6 VPN.

  • Ensure that a PE learns IPv6 routes with the same prefix from a CE and other VPNv6 peers.

Procedure

  • Configure IPv6 FRR.
    1. Run system-view

      The system view is displayed.

    2. Run ip vpn-instance vpn-instance-name

      The VPN instance view is displayed.

    3. Run ipv6-family

      The VPN instance IPv6 address family view is displayed.

    4. Run ipv6 frr

      IPv6 FRR is enabled.

    5. Run commit

      The configuration is committed.

  • Configure private network BGP auto FRR.
    1. Run system-view

      The system view is displayed.

    2. Run bgp as-number

      The BGP view is displayed.

    3. Run ipv6-family vpn-instance vpn-instance-name

      The BGP-VPN instance IPv6 address family view is displayed.

    4. Run auto-frr

      BGP auto FRR is enabled.

    5. (Optional) Run route-select delay delay-value

      A delay for selecting a route to the intermediate device on the primary path is configured. After the primary path recovers, an appropriate delay ensures that traffic switches back to the primary path after the intermediate device completes refreshing forwarding entries.

      The delay-value value is an integer ranging from 0 to 3600, in seconds. The default delay-value value is 0, indicating that the device on which FRR is configured selects a route to the intermediate device on the primary path without a delay.

    6. Run commit

      The configuration is committed.

Example

Run the display ipv6 routing-table vpn-instance vpn-instance-name [ ipv6-address ] verbose command on the PE to check the backup outbound interface and backup next hop of the IPv6 route in the routing table.

Run the display ipv6 routing-table vpn-instance vpn-instance-name verbose command on the PE. The command output shows that the IPv6 route has a backup outbound interface and a backup next hop.

<HUAWEI> display ipv6 routing-table vpn-instance vpn1 200:0:1:2::1 verbose
Routing Table : vpn1
Summary Count : 1

 Destination  : 200:0:1:2::1                    PrefixLength : 128
 NextHop      : 2001::1                         Preference   : 60
 Neighbour    : 2001::1                         ProcessID    : 0
 Label        : NULL                            Protocol     : Static
 State        : Active Adv Relied               Cost         : 0
 Entry ID     : 14                              EntryFlags   : 0x00000000
 Reference Cnt: 0                               Tag          : 0
 IndirectID   : 0x8a9                           Age          : 3sec 
 RelayNextHop : 2001::1                         TunnelID     : 0x0
 Interface    : GigabitEthernet0/2/0            Flags        : RD 
 BkNextHop    : ::FFFF:3.3.3.3                  BkInterface  : 0x0000000001004c4b42
 BkLabel      : 17                              BkTunnelID   : 0x0000000001004c4
 BkPETunnelID : 0x1002                          BkIndirectID : 0x1000396
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Updated: 2019-01-14

Document ID: EDOC1100058925

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