Cisco Cisco IOS Software Release 12.2(27)SBC

 lists the release history for these features.

Not all commands may be available in your Cisco IOS software release. For release information about a 
specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. 
Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images 
support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to 

. An account on Cisco.com is not required.

 lists only the Cisco IOS software release that introduced support for a given feature in a given 

Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS 
software release train also support that feature.

ISSU—DHCP Server

12.2(31)SB2

The DHCP server has been enhanced to support ISSU.

SSO—DHCP Server

12.2(31)SB2

12.2(33)SRB

The DHCP server has been enhanced to support SSO.

ISSU—DHCP Relay on Unnumbered Interface

12.2(31)SB2

The DHCP relay on unnumbered interface has been 
enhanced to support ISSU.

SSO—DHCP Relay on Unnumbered Interface

12.2(31)SB2

12.2(33)SRB

The DHCP relay on unnumbered interface has been 
enhanced to support SSO.

ISSU—DHCP Proxy Client

12.2(31)SB2

The DHCP proxy client has been enhanced to support ISSU.

SSO—DHCP Proxy Client

12.2(31)SB2

The DHCP proxy client has been enhanced to support SSO.

ISSU—DHCP ODAP Client and Server

12.2(31)SB2

The DHCP client and server have been enhanced to support 
ISSU.

SSO—DHCP ODAP Client and Server

12.2(31)SB2

The DHCP ODAP client and server have been enhanced to 
support SSO.