You can configure a grace period for Down servers. ACOS will continue to forward packets to Down ports for the duration of the grace period.
This option is useful for taking servers down for maintenance without immediately impacting existing sessions on the servers. The grace period can be 1-86400 seconds.
The service group must contain 2 or more servers for this feature to work.
l
This feature supports stateless and stateful load balancing. However, the feature is not supported for stateful hash load-balancing methods, such as source-IP-based or des-tination-IP-based hashing.
GUI Configuration
1.
Hover over ADC in the menu bar, then select Templates.
2.
Click Create and select Port from the drop-down list.
3.
Enter the desired grace period in the Down Grace Period field.
4.
Click OK.
CLI Configuration
To configure the grace period, use the down-grace-period command at the configuration level for the real port template.
Harishankar
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Copied from ADC guide:
Graceful Shutdown
You can configure a grace period for Down servers. ACOS will continue to forward packets to Down ports for the duration of the grace period.
This option is useful for taking servers down for maintenance without immediately impacting existing sessions on the servers. The grace period can be 1-86400 seconds.
The service group must contain 2 or more servers for this feature to work.
l
This feature supports stateless and stateful load balancing. However, the feature is not supported for stateful hash load-balancing methods, such as source-IP-based or des-tination-IP-based hashing.
GUI Configuration
1.
Hover over ADC in the menu bar, then select Templates.
2.
Click Create and select Port from the drop-down list.
3.
Enter the desired grace period in the Down Grace Period field.
4.
Click OK.
CLI Configuration
To configure the grace period, use the down-grace-period command at the configuration level for the real port template.
ACOS(config)# slb template port default
ACOS(config-rport)# down-grace-period 5000
ACOS(config-rport)# exit