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VRRP advertisements not reaching the backup(s)
If a master is forwarding traffic properly, but its backups are prevented from receiving the master's VRRP advertisements, both routers will operate in the master mode for the VR. If this occurs, traffic for the applicable gateway will continuously alternate between routers (sometimes termed "flapping".)
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A VLAN allows up to 32 VRs, and a VR allows up to 32 IP addresses. This means that one VR can support up to 32 subnets. This capacity enables use of VRRP on all subnets in a VLAN that has more than 32 subnets.
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Upgrading from a software version that only supports VRRPv2 retains the VRRPv2 mode.
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Downgrading to a VRRPv2 software version
Before downgrading to a software version that does not support VRRPv3, ensure that the active configuration does not include IPv6 settings. The downgrade is not supported if VRRP IPv6 settings are included in the active configuration file.
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Proxy-ARP requests and MAC addresses
The following table shows which MAC address is returned in response to a proxy-ARP request.
| Configured as: | Administratively: | Returns: |
|---|---|---|
| owner | Enabled | VRRP MAC address |
| owner | Disabled | Default VLAN MAC address |
| backup | Enabled, in master state | VRRP MAC address |
| backup | Enabled, not in master state | VRRP router does not respond to proxy-ARP request. |
| backup | Disabled | Default VLAN MAC address |
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There are no backward compatibility issues with the VRRP dynamic priority change feature. If a VRRP router has an older firmware version that does not have the dynamic priority change feature, it will not have the needed configuration options.
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The VR's operating VLAN cannot be configured as a tracking VLAN for that VR.
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Trunks that are tracked cannot be removed; you are not able to remove the last port from the trunk.
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LACP (active or passive) cannot be enabled on a port that is being tracked.
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If a VLAN is removed or a port becomes unavailable, the configuration is retained and they are tracked when they become available again.
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After the owner VR relinquishes control of its IP address, that IP address becomes unavailable to all other applications and routing protocols such as RIP and OSPF .
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To avoid operational issues, Hewlett Packard Enterprise recommends that VRRP is not run on the same interface/VLAN with other routing protocols, such as RIP and OSPF.