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authorNilton Moura <nmoura@nmoura.eti.br>2010-09-10 09:57:26 -0400
committerdsomero <xgizzmo@slackbuilds.org>2010-09-10 09:57:26 -0400
commitb4d4b7b05dc7dcaf073c1317b14d9a2ecb29ce54 (patch)
tree3ddf1a5508eac2109f699cfd1aa1926709b90fc8 /network/vrrpd/README
parent9d32da8f9923d608c23e040f44c1971b9a57dcfe (diff)
network/vrrpd: Added (Virtual Router Redundancy Protocol)
Signed-off-by: dsomero <xgizzmo@slackbuilds.org>
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+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.
+