DHCPv6 Relay and Server - MPLS VPN Support

Last Updated: December 3, 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.

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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


Note
You do not have to configure this feature on specified interfaces; if you want the feature to be enabled globally only on the router, perform steps 1, 2, and 3.
SUMMARY STEPS

1.    enable

2.    configure terminal

3.    ipv6 dhcp-relay option vpn

4.    interface type number

5.    ipv6 dhcp relay option vpn

6.    ipv6 dhcp relay destination ipv6-address [interface-type interface-number | vrf vrf-name | global]

7.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ipv6 dhcp-relay option vpn


Example:

Router(config)# ipv6 dhcp-relay option vpn

 

Enables the DHCP for IPv6 relay VRF-aware feature globally.

 
Step 4
interface type number


Example:

Router(config)# interface ethernet 0/0

 

Specifies an interface type and number, and enters interface configuration mode.

 
Step 5
ipv6 dhcp relay option vpn


Example:

Router(config-if)# ipv6 dhcp relay option vpn

 

Enables the DHCP for IPv6 relay VRF-aware feature on the specified interface. Enabling this command supersedes the configuration that is enabled by using the ipv6 dhcp-relay option vpn command.

 
Step 6
ipv6 dhcp relay destination ipv6-address [interface-type interface-number | vrf vrf-name | global]


Example:

Router(config-if)# ipv6 dhcp relay destination FE80::250:A2FF:FEBF:A056 ethernet 0/0

 

Specifies a destination address to which client messages are forwarded.

 
Step 7
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 

Configuring a VRF-Aware Server

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface type number

4.    ipv6 dhcp server vrf enable

5.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface type number


Example:

Router(config)# interface ethernet 0/0

 

Specifies an interface type and number, and enters interface configuration mode.

 
Step 4
ipv6 dhcp server vrf enable


Example:

Router(config-if)# ipv6 dhcp server vrf enable

 

Enables the DHCPv6 server VRF-aware feature on an interface.

 
Step 5
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 

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 (Ethernet0/0)
  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
RELAY#

Example: Configuring a VRF-Aware Server

Router# show ipv6 dhcp binding

Client: FE80::A8BB:CCFF:FE00:6400 
  DUID: 00030001AABBCC006400
  VRF : global
  Interface : Ethernet0/0
  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, Ethernet0/0

Additional References

Related Documents

Related Topic Document Title

IPv6 addressing and connectivity

IPv6 Configuration Guide

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IPv6 commands

Cisco IOS IPv6 Command Reference

Cisco IOS IPv6 features

Cisco IOS IPv6 Feature Mapping

Standards and RFCs

Standard/RFC Title

RFCs for IPv6

IPv6 RFCs

MIBs

MIB

MIBs Link

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

Description Link

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http://www.cisco.com/cisco/web/support/index.html

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.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1 Feature Information for DHCPv6 Relay and Server - MPLS VPN Support
Feature Name Releases Feature Information

DHCPv6 Relay - MPLS VPN Support

15.1(2)S

The DHCPv6 relay implementation allows the configuration of the destination VRF instance to which the relay messages will be forwarded.

The following commands were introduced or modified: ipv6 dhcp relay destination, ipv6 dhcp relay option vpn, ipv6 dhcp server vrf enable, show ipv6 dhcp relay binding.

DHCPv6 Server - MPLS VPN Support

15.1(2)S

The DHCPv6 server implementation of MPLS VPN support allows a per-pool configuration so DHCPv6 pools can be associated with a VRF instance.

The following commands were introduced or modified: ipv6 dhcp relay destination, ipv6 dhcp relay option vpn, ipv6 dhcp server vrf enable, show ipv6 dhcp relay binding.

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