Manual
Cisco IOS In Service Software Upgrade Process
Contents
2
Cisco IOS Release 12.2(28)SB
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image
support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on
Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at
the login dialog box and follow the instructions that appear.
Contents
• Prerequisites for Performing ISSU, page 3
• Restrictions for Performing ISSU, page 3
• Information About Performing ISSU, page 4
• How to Perform the ISSU Process, page 15
• Configuration Examples for Performing ISSU, page 23
• Additional References, page 30
• Command Reference, page 31
12.2(31)SGA Support for ISSU was introduced on the Cisco Catalyst 4500 series
platform.
Support for the following new features was added on the Cisco Catalyst
4500 series platform:
• Dynamic Host Configuration Protocol (DHCP) snooping
• EtherChannel - Port Aggregation Protocol (PagP) and Link Aggregate
Control Protocol (LACP)
• IEEE 802.1x protocol
• IEEE 802.3
• Internet Group Management Protocol (IGMP) snooping
• IP Host
• Port security
• Spanning-Tree Protocol (STP)
12.2(31)SB2 Support for the following new features were added to the 12.2(31)SB2
release:
• ISSU - Dynamic Host Configuration Protocol (DHCP) on-demand
address pool (ODAP) client/server
• ISSU - DHCP proxy client
• ISSU - DHCP relay on unnumbered interface
• ISSU - DHCP server
• ISSU - First Hop Routing Protocol (FHRP) - Gateway Load Balancing
Protocol (GLBP)
• ISSU - Intermediate System-to-Intermediate System (IS-IS)
• ISSU - Quality of Service (QoS)