Remember that only a single path is used with HSRP or VRRP, while other resources are
idle unless you’ve got multiple groups and gateways configured. This means that a single path
can be subjected to higher output queue rates during peak times, leading to lower performance
caused by higher jitter rates. The good news is that we can mitigate the impact of jitter with
GLBP because with it, more upstream bandwidth is available and additional upstream paths
are used.