Cisco Cisco IOS Software Release 12.2(4)B
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Cisco IOS Release 12.2(4)B
DHCP Relay Support for MPLS VPN Suboptions
Feature History
This feature module describes the DHCP Relay Support for MPLS VPN Suboptions feature in Cisco IOS
Release 12.2(4)B and includes the following sections:
Release 12.2(4)B and includes the following sections:
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Feature Overview
The DHCP relay agent information option (option 82) enables a Dynamic Host Configuration Protocol
(DHCP) relay agent to include information about itself when forwarding client-originated DHCP
packets to a DHCP server. The DHCP server can use this information to implement IP address or other
parameter-assignment policies. The DHCP relay agent information option is organized as a single DHCP
option that contains one or more suboptions that convey information known by the relay agent.
(DHCP) relay agent to include information about itself when forwarding client-originated DHCP
packets to a DHCP server. The DHCP server can use this information to implement IP address or other
parameter-assignment policies. The DHCP relay agent information option is organized as a single DHCP
option that contains one or more suboptions that convey information known by the relay agent.
In some environments, a relay agent resides in a network element that also has access to one or more
Multiprotocol Label Switching (MPLS) virtual private networks (VPNs). If a DHCP server wants to
offer service to DHCP clients on those different VPNs, the DHCP server needs to know the VPN in
which each client resides. The network element that contains the relay agent typically knows about the
VPN association of the DHCP client and includes this information in the relay agent information option.
Multiprotocol Label Switching (MPLS) virtual private networks (VPNs). If a DHCP server wants to
offer service to DHCP clients on those different VPNs, the DHCP server needs to know the VPN in
which each client resides. The network element that contains the relay agent typically knows about the
VPN association of the DHCP client and includes this information in the relay agent information option.
Release
Modification
12.2(4)B
This feature was introduced.