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Configuring VRRP

Matrix DFE Series and N-SA User’s Guide 9-3

Basic VRRP Configuration

Figure 9‐1showsabasicVRRPconfigurationwithasinglevirtualrouter.RoutersR1andR2are

bothconfiguredwithonevirtualrouter(

VRID1).RouterR1servesasthemasterandRouterR2

servesasthebackup.Thefourendhostsareconfiguredtouse10.0.0.1/16asthedefaultroute. IP

address10.0.0.1/16isassociatedwithvirtualrouterID(

VRID)1.

Figure 9-1 Basic VRRP Configuration

IfRouterR1shouldbecomeunavailable,RouterR2wouldtakeovervirtualrouter

VRID1andits

associatedIPaddresses.Packetssentto10.0.0.1/16wouldgotoRouterR2.WhenRouterR1comes

upagain,itwouldtakeoverasmaster,andRouterR2wouldreverttobackup.

Router R1 Configuration

UsethefollowingproceduretoconfigureRouterR1asshownbackinFigure 9‐1:

R1 R2

H1 H2 H3 H4

Default Route = 10.0.0.1/16

Master Backup

VRID 1

10.0.0.1/16

Interface Addr. = 10.0.0.1/16

VRID 1; Addr. = 10.0.0.1/16

Interface Addr. = 10.0.0.2/16

VRID 1; Addr. = 10.0.0.1/16

Procedure 9-1 Configuring Router 1 for Basic VRRP

Step Task Command(s)

1. In Global Configuration mode:

Create a routing interface for Router 1 on VLAN

interface vlan 1

2. In Interface Configuration mode:

Set and enable IP address 10.0.0.1

255.255.255.0 on this router and VLAN.

ip address 10.0.0.1 255.255.255.0

no shutdown

3. In Global Configuration mode:

Enable VRRP configuration mode on this router.

router vrrp