Symptoms

Overview 1. What is VRRP2. Why use VRRP Version 33. Difference between VRRP Version 2 and VRRP Version 3 in OS104. Points to be noted before changing VRRP Version to 35. Configuration6. Sample Configuration6. Verify The Configuration What is VRRP VRRP allows to configure virtual routers from groups of physical routers/layer three switches on a LAN. These virtual routing platforms form primary and backup pairs.VRRP helps us to avoid a single point of failure of a routers/layer three switches in the network. NOTE: DELL OS 10 Supports VRRP Version 2 and Version 3 Why use VRRP Version 3 VRRP Version 3 supports both IPv4 and IPv6. VRRP Version 2 does not support IPv6. Difference between VRRP Version 2 and VRRP Version 3 in OS10 FeatureVRRP Version 3VRRP Version 2IPv6SupportedNot SupportedAuthenticationNot SupportedSimple TextTimerCentiSecondsSecondsIEEE RFC Number37685798 * 1 CentiSecond = 0.01 Second NOTE: Change VRRP versions only after sufficient planning. Points to be Noted Before Changing VRRP Version to 3 OS10 Switches currently only support Version 2 or 3 in global mode. This means, in your switches, if VRRP V2 is already configured and working, changing VRRP Version 3 affects your working VRRP.VRRP V3 must be enabled manually on all switches in the network.The VRRP advertisement in version 3 is calculated in Centiseconds compared to seconds in version 2. If we have 3 misses, then the primary switch election takes place. Hence if timer vales are altered to lower values, packet misses for less than one second will trigger a reelection which may impact the network. Sometimes this can be undesirable.If you try to configure authentication for VRRP version 3 in OS10 cli it gives you an error "Authentication not valid with VRRP version 3 groups." This is because Authentication not supported in VRRP version 3If VRRPv2 is already configured and working changing to VRRPv3 might require deleting all existing VRRP configuration and reapplying VRRPv3 compliant configuration.If VRRPv3 is already configured and working changing to VRRPv2 might require deleting all existing VRRP configuration and reapplying VRRPv2 compliant configuration. Configuration CommandParameterOS10# configure terminalEnter configuration modeOS10(config)# vrrp version 3Configure VRRP Version 3OS10(config)# vrrp version 2Configure VRRP Version 2 NOTE: From OS10 Version 10.4.1.0 the option to have both VRRP Version 2 and 3 is removed. Sample Configuration OS10# configure terminalOS10(config)# vrrp version 3Options availableOS10(config)# vrrp version ? 2 Support VRRP version 2 3 Support VRRP version 3Error when we try to configure authentication in VRRPv3 OS10(conf-vlan2-vrid-1)# authentication simple-text test% Error: VRRP : Authentication not valid with VRRP version 3 groups. Verify The Configuration OS10(conf)# show vrrp briefInterface Group Priority Preempt State Version Primary addr(s) Virtual addr---------------------------------------------------------------------------------------------------------------------vlan1 IPv4 1 100 true init-state 3 0.0.0.0 10.0.0.1

Cause

Differences between VRRP Version 2 and 3 and how to change the VRRP version in DELL EMC OS10 Switches

Resolution

From OS10 Version 10.4.1.0 the option to have both VRRP Version 2 and 3 is removed.

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