VRRP implementation in RouterOS is compliant to VRRPv and VRRPv. Virtual Router Redundancy Protocol (VRRP) provides a solution by combining number of routers into logical group called Virtual Router (VR). VRRP allows to detect unreachable router within 3seconds without additional traffic overhead. It is possible to change parameters and make detection faster, but it will increase overhead of ND traffic especially if there are a lot of hosts. However it can take up to 38seconds to detect unreachable router. ND already has built in mechanism to determine unreachable routers. In IPv6 networks, hosts learn about routers by receiving Router Advertisements used by Neighbor Discovery (ND) protocol. One alternative is to use static routing, but if statically configured first hop fails, then host will not be able to communicate with other hosts. Mostly on larger LANs dynamic routing protocols ( OSPF or RIP) are used, however there are number of factors that may make undesirable to use dynamic routing protocols. This chapter describes the Virtual Router Redundancy Protocol (VRRP) support in RouterOS.
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