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Dell SmartFabric OS10 User Guide Release 10.5.4

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ip dhcp-relay vss-info

Configures the VRF information to be carried in the option 151 field of relay packets to the server which allows the DHCP server to decide the address pool for IP allocation.

Syntax
ip dhcp-relay vss-info type {0 [ value string]/1 [value 7-octet value]/255}
Parameters
  • 0 string - Enter the type as 0 then the VRF name.
  • 1 value - Enter the type as 1 then OUI:VRF-Index ,3 bytes OUI:4 bytes VRF_Index
  • 255 - Enter the type as 255 for global or default address space.
Defaults
No vss-info value is configured on the interface.
Command Mode
INTERFACE CONFIGURATION
Usage Information

The VRF values for subnet selection are sent to the DHCP server in the option 151 field only if ip dhcp-relay vss-enable is enabled at the Global level. The value of the VRF name must match a VRF configured on the DHCP server for a DHCP pool. It is not the name of a VRF configured on the local switch, as a result, no validation is performed.

  • To send the VRF information to the DHCP server, set the vss-info type as type-0 or type-1 and configure the corresponding VRF name string or VRF Octet value, respectively, on the interface.
  • If a no value or type-255 is passed as the vss value, the IP address is allocated from the default address pool of the server corresponding to the link selection subnet.
  • The type 0 and type 1 values configured on the client interfaces must contain the server-side VRF DHCP pool information. It is used by the server to allocate IP address to the clients from the requested VRF pool. The configured type 0 or type 1 value must be the VRF or VPN ID associated with the DHCP pool in the server.

You can configure the vss-info on all types of the DHCP client interfaces (Ethernet interface, port-channel, VLAN, and virtual-network).

NOTE: With VSS enabled, change in the vss-info configuration value at the interface after the client IP assignment takes effect in the subsequent renew process. If the client receives a NACK, the client starts the discovery process with the new values.

This command is restricted to netadmin and sysadmin role users.

Example 
OS10(conf-if-eth1/1/1)# ip dhcp-relay
server-override       Enable dhcp-relay server overrride sub-option
source-interface      Source interface for dhcp relay
vss-info              Configure VSS information

OS10-8986(conf-if-eth1/1/1)# ip dhcp-relay vss-info
type               Configure VSS type

OS10-8986(conf-if-eth1/1/1)# ip dhcp-relay vss-info type
0                Type-0
1                Type-1
255              Type-255 for global/default address space
OS10(config)# interface ethernet 1/1/1

OS10(conf-if-eth1/1/1)# ip dhcp-relay vss-info type 0 value vrf_red

OS10(conf-if-eth1/1/1)# ip dhcp-relay vss-info type 1 value F10:1234

OS10(conf-if-eth1/1/1)# ip dhcp-relay vss-info type 255
Supported Releases
10.5.2 or later

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