IP Addressing: DHCP Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
DHCPv6 Relay and Server - MPLS VPN Support
DHCPv6 Relay and Server - MPLS VPN Support
Last Updated: December 13, 2012
The Dynamic Host Configuration Protocol for IPv6 (DHCPv6) relay implementation allows the configuration of the destination virtual private network (VPN) routing and forwarding (VRF) instance to which the relay messages will be forwarded. The DHCPv6 server implementation of MPLS VPN support allows a per-pool configuration so DHCPv6 pools can be associated with a VRF instance.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
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Information About DHCPv6 Relay and Server - MPLS VPN Support
DHCPv6 Server and Relay--MPLS VPN Support
To facilitate managed central services in a Multiprotocol Label Switching (MPLS)-based network, DHCPv6 must be made MPLS-aware so that a single resource can be used to serve multiple VPNs instead of dedicating a resource to a single VPN.
The DHCPv6 server implementation of MPLS VPN allows a per-pool configuration so that DHCPv6 pools can be associated with a VPN routing and forwarding (VRF) instance. The DHCPv6 server differentiates clients from various VRFs and assigns an IPv6 prefix accordingly from the respective VRF pools. Meanwhile, the DHCPv6 bindings store the clients' VRF information.
The DHCPv6 relay implementation allows the configuration of the destination VRF instance to which the relay messages will be forwarded. The relay adds the client's VPN information while forwarding the client's DHCPv6 requests toward the server, and the relay agent then processes the client's VPN information in reply packets from the server.
The relay agent adds IPv6 static routes for delegated prefixes in corresponding clients' VRF, and the relay agent's high availability (HA) functionality synchronizes the VRF information while synchronizing static routes created by the relay process.
The DHCPv6 relay and server VRF-aware features are disabled by default.
How to Configure DHCPv6 Relay and Server - MPLS VPN Support
Configuring a VRF-Aware Relay and Server for MPLS VPN Support
Configuring a VRF-Aware Relay
Configuring a VRF-Aware Server
Configuration Examples for DHCPv6 Server - MPLS VPN Support
Example: Configuring a VRF-Aware Relay
Router# show ipv6 dhcp relay binding Relay Bindings associated with default vrf: Prefix: 2001:DB8:0:1::/64 (GigabitEthernet0/0/0) DUID: 00030001AABBCC006500 IAID: 196609 lifetime: 2592000 expiration: 12:34:28 IST Oct 14 2010 Summary: Total number of Relay bindings = 1 Total number of Relay bindings added by Bulk lease = 0
Example: Configuring a VRF-Aware Server
Router# show ipv6 dhcp binding Client: FE80::A8BB:CCFF:FE00:6400 DUID: 00030001AABBCC006400 VRF : global Interface : GigabitEthernet0/0/0 IA PD: IA ID 0x00030001, T1 302400, T2 483840 Prefix: 2001::1/64 preferred lifetime 604800, valid lifetime 2592000 expires at Oct 15 2010 03:18 PM (2591143 seconds) Router# show ipv6 route status IPv6 Routing Table - default - 4 entries Codes: C - Connected, L - Local, S - Static, U - Per-user Static route B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2 IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external ND - Neighbor Discovery O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 S 2001::/64 [1/0] via FE80::A8BB:CCFF:FE00:6400, GigabitEthernet0/0/0
Feature Information for DHCPv6 Relay and Server - MPLS VPN Support
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
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