Matrix DFE Series and N-SA User’s Guide 9-1
9
Configuring VRRP
ThischapterprovidesthefollowinginformationaboutconfiguringandmonitoringtheVirtual
RouterRedundancyProtocol(VRRP)ontheMatrixDFESeriesorN‐SAdevice:
VRRP Overview
ThissectionprovidesabriefoverviewofVRRPconfigurationontheMatrixDFESeriesorN‐SA
device.VRRPisdefinedinRFC3678.Thisprotocoleliminatesthesinglepointoffailureinherent
inthestaticdefaultroutedenvironmentbytransferringtheresponsibilityfromonerouterto
anotheriftheoriginal
routergoesdown.
EndhostsystemsonaLANareoftenconfiguredtosendpacketstoastaticallyconfigureddefault
router.Ifthisdefaultrouterbecomesunavailable,allthehoststhatuseitastheirfirsthoprouter
becomeisolatedonthenetwork.VRRPprovidesawaytoensurethe
availabilityofanendhost’s
defaultrouter.
ThisisdonebyassigningIPaddressesthatendhostsuseastheirdefaultroutetoa“virtual
router.”Amasterrouterisassignedtoforwardtrafficdesignatedforthevirtualrouter.Ifthe
masterroutershouldbecomeunavailable,abackuproutertakesover
andbeginsforwarding
trafficforthevirtualrouter.AslongasoneoftheroutersinaVRRPconfigurationisup,theIP
addressesassignedtothevirtualrouterarealwaysavailable,andtheendhostscansendpackets
totheseIPaddresseswithoutinterruption.
VRRP Terms and Definitions
Table 9‐1liststermsanddefinitionsusedinVRRPconfiguration.
For information about... Refer to page...
VRRP Overview 9-1
Configuring VRRP 9-2
Modifying a Configuration 9-13
Monitoring VRRP 9-17
VRRP Configuration Notes 9-17
Table 9-1 VRRP Terms and Definitions
Term Definition
VRID Virtual Router ID — a unique number associated with each VRRP routing interface.
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