4000 Router Series MPLS Configuration Guide

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Command

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14. Configure a cluster ID for the

route reflector.

reflector cluster-id { cluster-id |

ip-address }

By default, an RR uses its own

router ID as the cluster ID.

If more than one RR exists in a

cluster, use this command to

configure the same cluster ID for all

RRs in the cluster to avoid routing

loops.

15. Configure filtering of reflected

routes.

rr-filter

extended-community-list-number

By default, an RR does not filter

reflected routes.

Only IBGP routes whose extended

community attribute matches the

specified community list are

reflected.

By configuring different filtering

policies on RRs, you can implement

load balancing among the RRs.

Configuring inter-AS IPv6 VPN

If the MPLS backbone spans multiple ASs, you must configure inter-AS IPv6 VPN.

There are three inter-AS VPN solutions (for more information, see "Configuring MPLS L3VPN"). IPv6

MPLS L3VPN supports only inter-AS VPN option A and option C.

Before configuring inter-AS IPv6 VPN, complete these tasks:

• Configure an IGP for the MPLS backbone in each AS to ensure IP connectivity.

• Configure basic MPLS for the MPLS backbone of each AS.

• Configure MPLS LDP for the MPLS backbones so that LDP LSPs can be established.

The following sections describe inter-AS IPv6 VPN option A and option C. Select one according to your

network scenario.

Configuring inter-AS IPv6 VPN option A

Inter-AS IPv6 VPN option A applies to scenarios where the number of VPNs and that of VPN routes on

the PEs are relatively small.

To configure inter-AS IPv6 option A:

• Configure basic IPv6 MPLS L3VPN on each AS.

• Configure VPN instances on both PEs and ASBR PEs. The VPN instances on PEs allow CEs to access

the network, and those on ASBR PEs are for access of the peer ASBR PEs.

For more configuration information, see "Configuring MPLS L3VPN."

In the inter-AS IPv6 VPN option A solution, for the same IPv6 VPN, the route targets configured on the PEs

must match those configured on the ASBR-PEs in the same AS to make sure VPN routes sent by the PEs (or

ASBR-PEs) can be received by the ASBR-PEs (or PEs). Route targets configured on the PEs in different ASs

do not have such requirements.