Huawei quidway s7700 - Reporting Topology Changes of an Upper-Layer Network - Configuring Association between SEP and CFM

After receiving a SmartLink Flush packet, the edge device in a SEP segment floods FLUSH-
FDB packets to notify the other devices in the SEP segment of topology changes.
By default, no device in a SEP segment is enabled to process SmartLink Flush packets.
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10.5.4 Reporting Topology Changes of an Upper-Layer Network -
Configuring Association Between SEP and CFM
SEP runs at the access layer or aggregation layer. To help SEP networks to detect whether the
topology of an upper-layer network changes, you must configure association between SEP and
CFM on the device connecting the lower-layer network to the upper-layer network.
Context
When CFM detects a fault on the upper-layer network, the edge device notifies the OAM module
of the fault by sending a CFM packet. Then, on the edge device, the SEP status of the interface
associated with CFM changes to Down.
After the SEP status of the interface associated with CFM on the edge device is Down, an
interface on the peer device of the edge device in the SEP segment needs to send a Flush-FDB
packet to notify other nodes that the topology changes. After a device in the SEP segment
receives the Flush-FDB packet, the blocked interface on the device is unblocked and enters the
Forwarding state. Then, the interface sends a Flush-FDB packet to instruct the other nodes in
the SEP segment to refresh the MAC address forwarding table and the ARP table. Therefore,
the lower-layer network can sense the fault of the upper-layer network, and the reliable
transmission of services is ensured.
NOTE
IEEE 802.1ag defines protocols and practices for Operations, Administration and Maintenance (OAM).
IEEE 802.1ag Ethernet CFM protocols comprise three protocols that work together to help administrators
debug Ethernet networks. These protocols are continuity check, link trace and loopback protocols. CFM
provides network-level OAM and is applicable to large-scaled end-to-end networking.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
oam-mgr
The OAM management view is displayed.
Step 3 Run:
oam-bind ingress cfm md md-name ma ma-name egress sep segment segment-id interface
interface-type interface-number
Association between SEP and CFM is configured.
l md md-name: specifies a maintenance domain (MD). The total length of md-name and ma-
name cannot be greater than 44 characters.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 10 SEP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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