On Mon, Aug 5, 2019 at 11:38 AM Nicolas Chabbey <nchabbey@n3network.ch> wrote:
Are there any good reasons of using proprietary FHRPs like HSRP and GLBP over VRRP ?
HSRP has an potential advantage over VRRP in that HSRP speakers keep track of groups (virtual gateway clusters) in which they do not participate. The distinction could matter in a configuration where the routers all participate in dynamic routing and might be generating ICMP redirects to steer host traffic toward routers in different groups. A VRRP router will redirect the client traffic toward the physical interface of a (failure-prone) physical router (the redirect matches the sending router's routing table). An HSRP router recognizes that the preferred next-hop is participating in an HSRP group, so it redirects the client traffic toward the VIP associated with that group, rather than the physical router's interface. Since these redirects result in something akin to a static route in the host device, it's safer to have that route pointing at a virtual gateway than a physical interface. You could easily convince me that any access LAN including multiple routers participating in different FHRP groups is due for a redesign, so this distinction might be moot. But I think it's a neat subtlety. /chris