Users Guide

Table Of Contents
!
interface ethernet1/1/2
no shutdown
ip address 20.1.1.1/24
!
interface ethernet1/1/3
no shutdown
ip vrf forwarding hello
ip address 1.1.1.1/24
ip helper-address 30.1.1.2 vrf hello
ip dhcp-relay vss-info type 0 serverVRF
!
interface ethernet1/1/4
no shutdown
ip vrf forwarding hello
ip address 30.1.1.1/24
DHCP Server
You must use a VRF aware DHCP server that is compliant with the following RFC standards:
RFC 6607 - Virtual Subnet Selection Options (VSS).
RFC 3527 - Link Selection sub-option.
RFC 5107 - DHCP Server Identifier Override Sub-option.
Refer to the configuration guidelines of the DHCP Server you are planning to use for DHCP server-specific configuration.
Following are some of the key points to note to support use case 2:
IP pools for the DHCP client subnet on different VRFs connected to DHCP relay agent have to be defined in the DHCP
server.
The VRF name provided in the vss type 0 value must match the VRF name in the DHCP server.
The value provided for vss type 1 must match the VPN identifier configured in the DHCP server.
Use Case 3: DHCP Relay on VTEPs with DHCP Option-82 sub-options
5,11,151
The following example uses a Clos leaf-spine VXLAN with BGP EVPN topology to show how to set up DHCP relay on tenant
VRFs with Option-82 sub-options 5,11,151 on the VTEPs.
Option 5 = Link selection sub-option
Option 11 = Server ID Override Sub-option
Option 151 = Virtual Subnet Selection
System management
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