Cisco 10000 - Manual (Page 109)

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Cisco 10000 Series Router Software Configuration Guide
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Chapter 3 Configuring Remote Access to MPLS VPN
Configuration Tasks for RA to MPLS VPN
In Example 3-8 , the DHCP relay receives a DHCP request on Ethernet interface 0/1 and sends the
request to the DHCP server located at IP helper address 10.44.23.7, which is associated with the VRF
named red.
Example 3-8 Configuring DHCP Relay Support for MPLS VPN Suboptions
ip dhcp relay information option vpn
!
interface ethernet 0/1
ip helper-address vrf red 10.44.23.7
!
Specifying a VPN ID
To specify a VPN ID, enter the following commands beginning in global configuration mode:
Step 2 Router(config)# interface type number Specifies an interface and enters interface configuration mode.
Step 3 Router(config-if)# ip helper-address vrf
name [global] address
Forwards UDP broadcasts, including BOOTP, received on an
interface.
If the DHCP server resides in a VPN or global space that is
different from the VPN, the vrf name or global options allow you
to specify the name of the VRF or global space where the
DHCP server resides.
The vrf name argument is the virtual routing and forwarding
(VRF) instance for the VPN.
The global argument is the global routing table.
The address argument is the destination broadcast or host address
to be used when forwarding UDP broadcasts. You can configure
more than one helper address per interface.
Command Purpose
Command Purpose
Step 1 Router(config)# ip vrf vrf-name Creates a VRF routing table and a CEF forwarding table and
enters VRF configuration mode.
The vrf-name argument is the name you assign to the VRF.
Step 2 Router(config-vrf)# vpn id oui:vpn-index Assigns a VPN ID to the VRF.
The oui: argument is an organizationally unique identifier. The
IEEE organization assigns this identifier to companies. The OUI
is restricted to three octets.
The vpn-index argument identifies the VPN within the company.
This VPN index is restricted to four octets.