The remote backup service is configured to track the network-side interface status. In this
manner, the NE80E/40E can detect whether the TCP connection established by the remote
backup service has experienced a fault and/or recovered.
If devices have multiple uplinks with different bandwidth, configure different weights for uplink
interfaces based on the uplink bandwidths. If the interfaces have different rates, configure the
weights based on their rates. Configure a larger weight for a 10GE interface than a GE interface.
For example, interface A is 10GE, and the bandwidth planned for RUI is 5 Gbit/s; interface B
is GE, and the bandwidth planned for RUI is 1 Gbit/s; interface C is GE, and the bandwidth
planned for RUI is 0.5 Gbit/s. If you use interface B as a reference interface and configure its
weight as 10, the weight of interface A is 50 and that of interface C is 5.
NOTE
The formula is as follows: Fault rate = Total weight of faulty interfaces/Total weight of interfaces x 100%.
If interfaces B and C are faulty, fault rate = (10 + 5)/(50 + 10 + 5) x 100% = 23%. If interface A is faulty,
fault rate = 50/(50 + 10 + 5) x 100% = 77%.
Step 6
(Optional) Run:
switchover uplink
{
failure-ratio
failure-ratio
|
duration
duration
}
*
The threshold for a master/backup switchover due to uplink failures and the duration before the
switchover are configured.
By default, traffic is switched over from the master device to the slave device when all uplinks
on the master device fail.
When you run the
track interface
command, the weights specified must comply with the rules
of the master/backup VRRP switchover. If a master/backup switchover is performed based on
the fault rate of uplinks but a master/backup VRRP switchover is not performed, the slave device
forwards the network-side traffic back to the master device for processing after receiving the
traffic from the master device. In this case, the master device is congested with traffic because
the master/backup switchover is not performed at the same time as the master/backup VRRP
switchover.
When you run the
switchover uplink
command to configure a master/backup switchover to be
performed based on the fault rate of uplinks, also run the
peer-backup route-cost auto-
advertising
command in the system view to enable both devices to automatically generate
address pool user network routes (UNRs). In this situation, when a master/backup switchover
is performed based on the fault rate of uplinks, the priority of a UNR is reduced, but no UNRs
are withdrawn. This configuration prevents downstream traffic from being interrupted.
Step 7
(Optional) Run:
track monitor-group
group-name
switchover failure-ratio
percent
The remote backup service is configured to track the status of an interface group, and an uplink
bandwidth fault threshold percentage for triggering a master/slave switchover is configured.
After you run the
track monitor-group
command in the remote backup service view in which
the
track interface
command has been run, the device automatically deletes the
track
interface
and
switchover uplink
configurations and then controls service switching based on
the
track monitor-group
configuration.
Step 8
(Optional) Run:
track route-monitor-group
group-name
switchover failure-ratio
percent
The remote backup service is configured to track the status of a route group, and an uplink
bandwidth fault threshold percentage for triggering a master/slave switchover is configured.
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
11 Multi-node Backup Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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