Cisco Cisco IOS Software Release 12.2(27)SBC
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ISSU - GLBP
GLBP supports In Service Software Upgrade (ISSU). In Service Software Upgrade (ISSU) allows a
high-availability (HA) system to run in Stateful Switchover (SSO) mode even when different versions
of Cisco IOS software are running on the active and standby Route Processors (RPs) or line cards.
high-availability (HA) system to run in Stateful Switchover (SSO) mode even when different versions
of Cisco IOS software are running on the active and standby Route Processors (RPs) or line cards.
ISSU provides the ability to upgrade or downgrade from one supported Cisco IOS release to another
while continuing to forward packets and maintain sessions, thereby reducing planned outage time. The
ability to upgrade or downgrade is achieved by running different software versions on the active RP and
standby RP for a short period of time to maintain state information between RPs.
while continuing to forward packets and maintain sessions, thereby reducing planned outage time. The
ability to upgrade or downgrade is achieved by running different software versions on the active RP and
standby RP for a short period of time to maintain state information between RPs.
This feature provides customers with the same level of HA functionality for planned outages due to
software upgrades as is available with SSO for unplanned outages. That is, the system can switch over
to a secondary RP and continue forwarding packets without session loss and with minimal or no packet
loss. This feature is enabled by default.
software upgrades as is available with SSO for unplanned outages. That is, the system can switch over
to a secondary RP and continue forwarding packets without session loss and with minimal or no packet
loss. This feature is enabled by default.
Configuration Information
Configuration information is included in the
Cisco IOS In Service Software Upgrade Process
document.
at the following URL:
Additional information is included in the “Configuring GLBP” module of the Cisco IOS IP Application
Services Configuration Guide, Release 12.4T
Services Configuration Guide, Release 12.4T
at the following URL:
The following sections provide information about this feature:
•
ISSU GLBP
For a complete list of features included in the “Configuring GLBP” module, see the Feature Information
Table located toward the end of the module.
Table located toward the end of the module.
Command Reference Information
Command reference information is included in the
Cisco IOS IP Application Services Command
Reference,
Release 12.2SB2 at the following URL: