The GSLBSvcStateDelayTime parameter specifies a grace period in seconds. When the Metrics Exchange Protocol (MEP) connection between two GSLB sites is lost, the local Citrix ADC appliance waits for this specified duration before marking the GSLB services associated with the remote site as DOWN. In this scenario, with the value set to 10, if the MEP connection fails, the local appliance will wait 10 seconds. If the connection is not re-established within that time, it will then change the state of the remote GSLB services to DOWN. This mechanism prevents state flapping due to transient network issues.

B. This reverses the cause and effect. The MEP connection is the communication channel; a single GSLB service going DOWN does not cause the entire MEP connection to be marked DOWN.

C. This is incorrect. The MEP connection is between the Citrix ADC appliances at different sites. The state of a local GSLB virtual server does not determine the state of the MEP connection.

D. This option is imprecise. While a remote LB server (Citrix ADC) going down would cause the MEP connection to fail, the direct trigger for this timer is the loss of the MEP connection itself, as correctly stated in option A.

1. Citrix ADC 13.0 Product Documentation: In the section describing GSLB parameters

the GSLB Service State Delay Time is defined. It states

"In a GSLB deployment

a GSLB service is marked as DOWN if the MEP connection is down. You can configure a delay for the GSLB services to be marked as DOWN." This confirms the parameter applies after the MEP connection is lost.

Source: Citrix ADC 13.0 Documentation

"Global Server Load Balancing" > "Configuring GSLB" > "Configuring GSLB Parameters".

2. Citrix ADC 13.0 Command Reference: The official command reference for set gslb parameter explicitly defines the -GSLBSvcStateDelayTime argument.

Source: Citrix ADC 13.0 Command Reference

set gslb parameter command details. The description for GSLBSvcStateDelayTime states: "Delay time (in seconds)

after which the GSLB services are marked as DOWN. In a GSLB deployment

a GSLB service is marked as DOWN if the MEP connection is down."