Have you configured glbp forwarder preempt ? Preempt need to be enabled to achieve the result. glbp forwarder preempt To configure a router to take over as active virtual forwarder (AVF) for a Gateway Load Balancing Protocol (GLBP) group if it has higher priority than the current AVF, use the glbp forwarder preempt command in interface configuration mode. To disable this feature, use the no form of this command. glbp group forwarder preempt [ delay minimum seconds ] no glbp group forwarder preempt [ delay minimum ] Doc here: http://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html#wp1043971
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