KB.15.15

ManualsBrandsHP ManualsNetwork HardwareHP 5412R-92G-PoE+/2SFP+ (No PSU) v2 zl2 Switch

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Standards compliance

VRRP on the switches includes the following:

• Complies with RFC 3768 VRRP version 2.

• Complies with RFC 5798 version 3 with two exceptions—advertisement intervals below one

second are not supported, and accept mode is not supported (only ping application for

virtual-ip-ping).

• Compatible with HP Series 9300m routers, the HP 9408sl router, and the HP Series 8100fl

switches. (VRRP on these devices is based on RFC 2338.)

• Complies with RFC 2787—Definitions of Managed Objects for VRRP, except for support for

authentication-related values.

• Unified standard MIB RFC 6527 supports both IPv4 and IPv6.

• Private MIB hpicfVrrpv3.mib is added to support new IPv6 extensions and VR-specific extensions

of the deprecated, private MIB hpcifVrrp.mib. Global extensions still use hpicfVrrp.mib

Operating notes

• 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".)

• Deleting an IP address used to support a VR

• VR limits

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.

• Upgrading from VRRPv2

Upgrading from a software version that only supports VRRPv2 retains the VRRPv2 mode.

• 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.

• Proxy-ARP requests and MAC addresses

The following table shows which MAC address is returned in response to a proxy-ARP request.

Returns:Administratively:Configured as:

VRRP MAC addressEnabledowner

Default VLAN MAC addressDisabledowner

VRRP MAC addressEnabled, in master statebackup

VRRP router does not respond to

proxy-ARP request.

Enabled, not in master statebackup

Default VLAN MAC addressDisabledbackup

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