- DHCP Overview
- Configuring the Cisco IOS DHCP Server
- Configuring the Cisco IOS DHCP Relay Agent
- DHCP Relay Server ID Override and Link Selection Option 82 Suboptions
- DHCP Client
- DHCP Server Port-Based Address Allocation
- IPv6 Access Services: DHCPv6 Relay Agent
- IPv6 Access Services: Stateless DHCPv6
- IPv6 Access Services: DHCPv6 Prefix Delegation
- DHCP—DHCPv6 Guard
- DHCPv6 Individual Address Assignment
- DHCPv6 Relay—Lightweight DHCPv6 Relay Agent
- DHCPv6 Relay and Server - MPLS VPN Support
DHCPv6 Relay and Server - MPLS VPN Support
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.
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.
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 a device, perform steps 1, 2, and 3 |
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
Configuring a VRF-Aware Server
1.
enable
2.
configure
terminal
3.
interface
type
number
4.
ipv6
dhcp
server
vrf
enable
5.
end
DETAILED STEPS
Configuration Examples for DHCPv6 Server - MPLS VPN Support
Example: Configuring a VRF-Aware Relay
Device# 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
Device# 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) Device# show ipv6 route static 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 |
|
IPv6 commands |
Cisco IOS IPv6 Command Reference |
Cisco IOS IPv6 features |
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: |
Technical Assistance
Description |
Link |
---|---|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
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.
Feature Name |
Releases |
Feature Information |
---|---|---|
VRF aware DHCPv6 relay |
15.2(1)SY |
The VRF aware DHCPv6 relay feature ensures that the DHCPv6 relay involved in forwarding IP addresses is VRF aware. |