Overview - Huawei Quidway NetEngine80E Configuration Manual

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing

11.1 Overview

This section describes the route monitoring group and its features supported by the NE80E/
40E.
11.1.1 Introduction
All monitored network-side routes of the same type can be added to a group called a route
monitoring group. Each route monitoring group is identified by a unique name.
A route monitoring group monitors the status of its member routes, each of which has a down-
weight. The down-weight sum of the route monitoring group changes with the number of routes
that are Down and indicates the link quality. If a route in the route monitoring group goes Down,
its down-weight is added to the down-weight sum of the route monitoring group. If a route in
the route monitoring group goes Up again, its down-weight is subtracted from the down-weight
sum of the route monitoring group.
Service modules can be associated with the route monitoring group, and a switchover threshold
can be configured for each service module to perform a primary/backup access-side link
switchover. If the down-weight sum of the route monitoring group reaches the switchover
threshold of a service module, the routing management (RM) module instructs the service
module to switch services from the primary link to the backup link. If the down-weight sum of
the route monitoring group falls below the threshold, the RM module instructs the service module
to switch services back.
If a service module is associated with a route monitoring group in a dual-device hot backup
scenario, services can be switched to the backup link if the primary link fails, therefore preventing
traffic overload or forwarding failures.
11.1.2 Route Monitoring Group Features Supported by the NE80E/
40E
A down-weight can be set for each route in the route monitoring group based on link attributes,
such as the bandwidth, and a switchover threshold can be set for each service module that is
associated with the route monitoring group to perform a primary/backup access-side link
switchover.
l
l
As shown in
weight of 10. The route monitoring group is associated with service modules A, B, C, and D
whose switchover thresholds are 80, 50, 30, and 20, respectively.
Issue 02 (2014-09-30)
A route monitoring group monitors the status of its member routes. If a route in the group
goes Down, its down-weight is added to the down-weight sum of the route monitoring
group. If the down-weight sum of the route monitoring group reaches the switchover
threshold of a service module, the RM module instructs the service module to switch
services from the primary link to the backup link.
If a route in the route monitoring group goes Up again, its down-weight is subtracted from
the down-weight sum of the route monitoring group. If the down-weight sum of the route
monitoring group falls below the threshold of a service module, the RM module instructs
the service module to switch services back.
Figure 11-1, the route monitoring group contains 10 routes, each having a down-
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11 Route Monitoring Group Configuration
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