so the way the trains work is the feature guide is for the 15.2.X release notes , so yes it would also be in 15(2)4 s its covered under same release guide , GLBP is a standard FHRP feature it would be in most releases
you can check where you download the software and filter through the actual config guide for each release but id be certain its there already
I just checked one of my stacks and its there even earlier at 15.0 , its known feature been around along time , i think its in nearly all ios/ios-xe switches but not nx-os , there ipservices switches i dont have low license 3750x stacks to test on
(config)#int vlan 152 (config-if)#g (config-if)#glbp ? <0-1023> Group number
(config-if)#do sh ver | i 15 Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE11, RELEASE SOFTWARE (fc3) System image file is "flash:c3750e-universalk9-mz.150-2.SE11.bin" * 1 54 WS-C3750X-48 15.0(2)SE11 C3750E-UNIVERSALK9-M 2 54 WS-C3750X-48 15.0(2)SE11 C3750E-UNIVERSALK9-M
actually if i search the link you agave its in there , you need a license though for FHRP ipbase or services
A client process such as HSRP, Virtual Router Redundancy Protocol (VRRP), or Gateway Load Balancing Protocol (GLBP), can register its interest in tracking objects and then be notified when the tracked object changes state. NoteNote
Enhanced Object Tracking is not supported on switches running the LAN Base image.
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