Cisco Catalyst 6500 Series - Configuring a Hitless Upgrade

7-9
Catalyst 6500 Series Content Switching Module Configuration Note
OL-4612-01
Chapter 7 Configuring Redundant Connections
Configuring a Hitless Upgrade
This example shows how to set fault tolerance for connection redundancy:
Router(config-module-csm)# vserver VS_LINUX-TELNET
Router(config-slb-vserver)# virtual 10.6.0.100 tcp telnet
Router(config-slb-vserver)# serverfarm SF_NONAT
Router(config-slb-vserver)# sticky 100 group 35
Router(config-slb-vserver)# replicate csrp sticky
Router(config-slb-vserver)# replicate csrp connection
Router(config-slb-vserver)# inservice
Router(config-slb-vserver)# exit
Router(config-module-csm)# ft group 90 vlan 111
Router(config-slb-ft)# priority 10
Router(config-slb-ft)# failover 3
Router(config-slb-ft)# preempt
Router(config-slb-ft)# exit
Configuring a Hitless Upgrade
A hitless upgrade allows you to upgrade to a new version without any major service disruption due to
the downtime for the upgrade. To configure a hitless upgrade, perform these steps:
Step 1 If you have preempt enabled, turn it off.
Step 2 Perform a write memory on standby.
Step 3 Upgrade the standby system with the new release, and then reboot the CSM.
Step 4
Router(config-slb-vserver)#
virtual
ip-address [ ip-mask ]
protocol
port-number [service
ftp]
Configures the virtual server attributes.
Step 5
Router(config-slb-vserver)#
serverfarm
serverfarm-name
Associates a server farm with a virtual server.
Step 6
Router(config-slb-vserver)#
sticky
duration [group
group-id ] [netmask
ip-netmask ]
Ensures that connections from the same client use the same real
server.
Step 7
Router(config-slb-vserver)#
replicate csrp sticky
Enables sticky replication.
Step 8
Router(config-slb-vserver)#
replicate csrp connection
Enables connection replication.
Step 9
Router(config-slb-vserver)#
inservice
Enables the virtual server for load balancing.
Step 10
Router(config-module-csm)# ft
group group-id vlan vlanid
Configures fault tolerance and enters the fault-tolerance
submode.
Step 11
Router(config-slb-ft)#
priority
value
Sets the priority of the CSM.
Step 12
Router(config-slb-ft)#
failover
failover-time
Sets the time for a standby CSM to wait before becoming an
active CSM.
Step 13
Router(config-slb-ft)#
preempt
Allows a higher priority CSM to take control of a fault-tolerant
group when it comes online.
Command Purpose