Manual

Cisco IOS In Service Software Upgrade Process

Information About Performing ISSU

Cisco IOS Release 12.2(28)SB

newest release that contains the latest information about compatibility with existing releases in the field.

The compatibility matrix is available within the Cisco IOS software image and on Cisco.com so that

users can determine in advance whether an upgrade can be done using the ISSU process.

Before attempting an ISSU, you should determine the compatibility level between the Cisco IOS

software versions on the active and the standby RPs. To display the compatibility matrix data between

two software versions on a given system, enter the show issu comp-matrix negotiated command.

ISSU-Capable Protocols and Applications

The following protocols and applications support ISSU:

• ISSU - ARP —ARP supports ISSU.

• ISSU - ATM—The ATM application supports ISSU. The application requirements for ISSU are as

follows:

–

Identify the ATM client as nonbase

–

Support message versioning of ATM HA event synchronous messages

–

Provide capability exchange between peers

• ISSU - Dynamic Host Configuration Protocol (DHCP) on-demand address pool (ODAP)

client/server—This feature supports ISSU.

• ISSU - DHCP proxy client—The DHCP proxy client feature supports ISSU.

• ISSU - DHCP relay on unnumbered interface—The DHCP relay on unnumbered interface feature

supports ISSU.

• ISSU - DHCP server—The DHCP server feature supports ISSU.

• ISSU - DHCP snooping—DHCP snooping supports ISSU.

• ISSU - EtherChannel - PagP LACP—PagP and LACP support ISSU.

• Cisco Express Forwarding—Cisco Express Forwarding (CEF) supports ISSU.

• ISSU - FHRP/GLBP—The Gateway Load Balancing Protocol (GLBP) supports ISSU.

• ISSU - FHRP/HSRP—The Hot Standby Router Protocol (HSRP) supports ISSU.

• ISSU - Frame Relay—The Frame Relay protocol supports ISSU.

• ISSU - HDLC—The High-Level Data Link Control (HDLC) protocol supports ISSU.

• ISSU - IEEE 802.1x—The IEEE 802.1x protocol supports ISSU.

• ISSU - IEEE 802.3af—IEEE 802.3af supports ISSU.

• ISSU - IGMP snooping—IGMP snooping supports ISSU.

• ISSU - IP Host—The IP host supports ISSU.

• ISSU - IS-IS - IS-IS protocol supports ISSU.

• ISSU - MPLS L3VPN—Multiprotocol Label Switching (MPLS) supports ISSU. For information

about upgrading ISSU MPLS-related applications through ISSU, see the ISSU MPLS Clients

document.

• ISSU - Port Security—Port security supports ISSU.

• ISSU - PPP/MLP—The PPP and multilink PPP (MLP) protocols support ISSU.

• ISSU - QoS support—The Quality of Service (QoS) feature supports ISSU.