Huawei quidway s7700 - Reporting Topology Changes of a Lower-Layer Network

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Data Preparation

To configure the topology change notification function, you need the following data.

No. Data

1 SEP segment ID

2 Mode of reporting topology changes

Names of the Maintenance Domain (MD) and the Maintenance Association (MA),

ID and type of a MEP, name of the interface on which the Maintenance association

End Point (MEP) resides, name of the interface enabled with Ethernet CFM, and name

of the interface associated with Ethernet CFM

10.5.2 Reporting Topology Changes of a Lower-Layer Network -

SEP Topology Change Notification

SEP runs at the access layer. To help an upper-layer network to detect whether the topology of

the network at the access layer changes, configure the SEP topology change notification function

on the device connecting the lower-layer network to the upper-layer network.

Context

If the topology of a specified SEP segment changes but the topology change is not reported to

the upper-layer network in time, the MAC address tables of the devices on the upper-layer

network retain the MAC address entries generated before the topology of the lower-layer

network changes. As a result, user traffic is interrupted. To ensure nonstop traffic forwarding,

configure the device on the lower-layer network to report topology changes to the upper-layer

network. The objects that are notified of topology changes can be specified as needed.

NOTE

Currently, topology changes of a SEP segment can be reported to other SEP segments, STP networks,

RRPP networks and SmartLink networks

After receiving a packet indicating topology changes of a lower-layer network, a device on an

upper-layer network sends TC packets locally to instruct the other devices on this network to

clear associated MAC addresses and relearn MAC addresses after the topology of the lower-

layer network changes. This ensures nonstop traffic forwarding.

Procedure

Step 1 Run:

system-view

The system view is displayed.

Step 2 Run:

sep segment segment-id

A SEP segment is created and the view of the SEP segment is displayed.

Step 3 Run:

Quidway S7700 Smart Routing Switch

Configuration Guide - Ethernet 10 SEP Configuration

Issue 01 (2011-07-15) Huawei Proprietary and Confidential

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Huawei quidway s7700 - Reporting Topology Changes of a Lower-Layer Network - SEP Topology Change Notification