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Diffstat (limited to 'network/vrrpd/README')
| -rw-r--r-- | network/vrrpd/README | 34 |
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diff --git a/network/vrrpd/README b/network/vrrpd/README new file mode 100644 index 0000000000..9dbf7a280e --- /dev/null +++ b/network/vrrpd/README @@ -0,0 +1,34 @@ +VRRP daemon (vrrpd) is an RFC 2338 compliant implementation of the +Virtual Router Redundancy Protocol (VRRP). The Virtual Router Redundancy +Protocol is designed to eliminate the single point of failure associated +with statically routed networks by automatically providing failover using +multiple LAN paths through alternate routers. + +As specified in RFC 2338, VRRP uses an election protocol that dynamically +assigns responsibility for a virtual router to one of the VRRP routers on +a LAN. When a VRRP router controls the IP address(es) associated with a +virtual router, it is called the Master. The Master continues to forward +packets sent to these IP addresses until it has a problem that causes the +VRRP routers to hold an election. The election process provides dynamic +failover by electing a new Master should the existing Master become +unavailable. + +The virtual router associated with each alternate path under VRRP uses the +same IP address and MAC address as the routers for other paths. As a result, +the host's gateway information does not change, no matter what path is used. +Because of this design, VRRP-based redundancy significantly reduces +administrative overhead when compared to redundancy schemes that require +hosts to be configured with multiple default gateways. + +The primary function of the Virtual Router Redundancy Protocol is to provide +routing redundancy for specific IP addresses. In addition to this primary +function, RFC 2338 also states that the protocol should: + + * Minimize the duration of black holes. + * Minimize the steady state bandwidth overhead and processing complexity. + * Function over a variety of multiaccess LAN technologies that support IP + traffic. + * Provide for election of multiple virtual routers on a network for load + balancing. + * Support multiple logical IP subnets on a single LAN segment. + |