Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 844)

820 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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Configuring 6VPE
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• Customer A sites: Advertise IPv6 routes.
• Customer B sites: Advertise IPv6 routes.
• PE1: The source or the ingress label switch router (LSR).
• PE2 and PE3: The destination or the egress LSRs.
The topology shows different customer sites that are connected through IPv4 MPLS network and
operating with IPv6 address families. The PE routers run dual stack IPv4 and IPv6. Customer A’s
site 1 and site 2 are connected through the MPLS cloud and a different VRF is maintained at PE for
each customer. Customer A’s site 1 connected to PE1 with VRF A and customer B’s site 1 is
connected to PE1 with VRF B.
Table 163 provides information about the different routing protocols that are used for advertising
routes between the customer sites (CE) and the PE routers in the MPLS network.
TABLE 163 6VPE route advertising
Connectivity Protocols
PE to CE routing BGP+, OSPFv3, or RIPng
PE to PE routing (exchanging IPv6 routes with VRF
label) MP-BGP
Exchanging of tunnel labels in MPLS cloud LDP, RSVP
The following steps describe 6VPE in an existing MPLS domain:
1. Each customer site advertises IPv6 routes to attached PE routers. The PE routers receive the
routes on their specific VRFs.
2. The PE routers assign VRF labels to all the received IPv6 packets.
3. The PE routers advertise the received routes to remote PE routers with IPv6 VRF label. The IPv6
VRF label is unique for each VRF within the PE.
4. The IPv6 packets are forwarded in the MPLS cloud based on the corresponding VRF routing
table with IPv6 VRF labels.
5. The 6VPE router forwards the IPv6 packets from the customer router using the existing IPv4
LSPs.
6VPE limitations
6VPE supports only IPv6 unicast forwarding and does not support IPv6 multicast forwarding.
Configuring 6VPE
Perform the following steps to configure 6VPE over an IPv4-based MPLS network.
1. VRF configuration
Create a VRF instance:
Brocade(config)# vrf A