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37-6
Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter37 IPv6 over MPLS: 6PE and 6VPE
Scalability Numbers
Scalability Numbers
Table 37-1 shows the scalability numbers for the 6PE and 6VPE feature.
How to Configure IPv6 over MPLS: 6PE and 6VPE
This section describes how to configure IPv6 over MPLS: 6PE and 6VPE feature:
• Configuring 6PE, page 37-6 (Required)
• Configuring 6VPE, page 37-9 (Required)
• Verifying IPv6 over MPLS: 6PE and 6VPE Configuration, page 37-15 (Optional)
Configuring 6PE
Ensure that you configure 6PE on PE routers participating in both the IPv4 cloud and IPv6 clouds. To
learn routes from both clouds, you can use any routing protocol supported on IOS (BGP, OSPF, IS-IS,
EIGRP, Static).
BGP running on a PE router should establish (IPv4) neighborhood with BGP running on other PEs.
Subsequently, it should advertise the IPv6 prefixes learnt from the IPv6 table to the neighbors. The IPv6
prefixes advertised by BGP would automatically have IPv4-encoded-IPv6 addresses as the
nexthop-address in the advertisement.
To configure 6PE, complete the following steps:
SUMMARY STEPS
1. enable
2. configure terminal
3. ip cef
4. ipv6 cef
5. ipv6 unicast-routing
6. router bgp as-number
7. no synchronization
8. no bgp default ipv4-unicast
Table 37-1 Scalability Numbers for 6PE and 6VPE
Interface Numbers
Number of VRFs 113
Number of VPNv6 prefixes per VRF About 4000
1
Number of VPNv6 prefixes About 4000
37-1
Number of global IPv6 prefixes About 4000
37-1
1. This number is limited by the MPLS label usage on the PE router. The maximum number of label space shared between IPv4
and IPv6 is 4000.