Monday's here and I feel like I'm ready to get back on track. What better way to start off the week than with a new cheat sheet? This one is on HSRP, VRRP, and GLBP, which are collectively classified as first hop redundancy protocols.
It is somewhat irritating that we have three protocols which accomplish nearly the same tasks. HSRP and VRRP are practically identical, while GLBP expands their functionality to offer load balancing. Interestingly, VRRP does not support IPv6, as IPv6 can provide more robust router discovery through its Neighbor Discovery Protocol. Cisco has included IPv6 support in HSRP and GLBP, though.