Troubleshooting Vrrp - Huawei Quidway S3900 Series Operation Manual

Operation Manual – VRRP
Quidway S3900 Series Ethernet Switches-Release 1510
# Set the backup group priority value of switch B to 110, and specify to decrease the
priority value by 20 when the result of detecting group 9 is unreachable.
[Quidway B-Vlan-interface1] vrrp vrid 1 priority 110
[Quidway B-Vlan-interface1] vrrp vrid 1 track detect-group 9 reduced 20
Configure Switch D.
# Assign an IP address to VLAN 1 interface.
<Quidway D> system-view
[Quidway D] interface vlan-interface 1
[Quidway D-Vlan-interface1] ip address 192.168.1.3 24
# Enable VRRP on VLAN 1 interface and assign a virtual IP address to the backup
group.
[Quidway D-Vlan-interface1] vrrp vrid 1 virtual-ip 192.168.1.10
# Set the backup group priority value of Switch D to 100.
[Quidway 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 out 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 resorted to.
II. Symptom 2: More than one master existing within a backup group
There are also 2 reasons. One is short time coexistence of many master switches,
which is normal and needs no manual intervention. Another is the long time
coexistence of many master switches, which may be 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 through, 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 duration and authentication type configured on each member switch
must be guaranteed.
Huawei Technologies Proprietary
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Chapter 1 VRRP Configuration