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Operation Manual – VRRP

H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1

VRRP Configuration

1-19

[H3C D] interface vlan-interface 1

[H3C D-Vlan-interface1] ip address 192.168.1.3 24

# Crate a backup group on VLAN-interface1 and assign a virtual IP address to the

backup group.

[H3C D-Vlan-interface1] vrrp vrid 1 virtual-ip 192.168.1.10

# Set the backup group priority of Switch D to 100.

[H3C D-Vlan-interface1] vrrp vrid 1 priority 100

1.5 Troubleshooting VRRP

You can locate VRRP problems through the configuration and debugging information.

Here are some possible failures you might meet and the corresponding troubleshooting

methods.

I. Symptom 1: Frequent prompts of configuration errors on the console

This indicates that incorrect VRRP packets are received. It may be because of the

inconsistent configuration of the switches within the backup group, or the attempt of

other devices sending illegal VRRP packets. The first possible fault can be solved

through modifying the configuration. And as the second possibility is caused by the

malicious attempt of some devices, non-technical measures should be taken.

II. Symptom 2: More than one master existing within a backup group

There are also 2 reasons. One is short coexistence of many master switches, which is

normal and needs no manual intervention. Another is long coexistence of many master

switches, which may be caused because the original master switch and other member

switches in a backup group cannot receive VRRP packets from each other, or receive

some illegal packets.

To solve such a problem, an attempt should be made to ping among these masters and

if such an attempt fails, check the connectivity between related devices. If they can be

pinged, check VRRP configuration. For the configuration of a VRRP backup group,

complete consistency for the number of virtual IP addresses, each virtual IP address,

timer interval and authentication type configured on each member switch must be

guaranteed.

III. Symptom 3: VRRP state of a switch changes repeatedly

Such problems occur when the backup group timer interval is too short. They can be

solved through prolonging the interval or configuring the preemption delay period.

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