Routers on which timer values are not configured can learn timer values from the active virtual gateway (AVG). The timers configured on the AVG always override any other timer settings. All routers in a GLBP group should use the same timer values. If a GLBP gateway sends a hello message, the information should be considered valid for one holdtime. Normally, holdtime is greater than three times the value of hello time, (holdtime > 3 * hellotime).
depend on your IGP timers how soon they converge. but in LAN side redundency prospective it's tunning is doable. If ur both the swtiches are connected to core with two link i mean one link to 1st core other link to other core then for outside network your convergence will not affect the network but for GLBP convergence it could be 1 sec and lesser than that.
but ultimately ur session is going to discunnect at the time of failiour becos application are so sestive to delay.
so my suggesion is to tune the GLBP OR VRRP OR HSRP and connect your distribution switches with both the core and you are on the fly that's all.
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