Example For Configuring A Hybrid Sep+Mstp Ring Network - Huawei Quidway S7700 Configuration Manual - Ethernet

Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
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10.7.3 Example for Configuring a Hybrid SEP+MSTP Ring Network

In the networking of this configuration example, the two devices where the access layer and the
aggregation layer are intersected do not support SEP. You can configure SEP at the access layer
to implement redundancy protection switching and configure the function of advertising
topology changes on an edge device in a SEP segment. This helps an upper-layer network to
detect topology changes of a lower-layer network in time.
Networking Requirements
Generally, redundant links are used to connect an Ethernet switching network to an upper-layer
network to provide link backup and enhance network reliability. The use of redundant links,
however, may produce loops, causing broadcast storms and rendering the MAC address table
unstable. As a result, the communication quality deteriorates, and communication services may
even be interrupted. SEP can be deployed on the ring network to block redundant links and
unblock them if a link fault occurs.
As shown in
and multiple Layer 3 devices form a ring at the aggregation layer. In this case, SEP needs to run
at the access layer to implement the following functions:
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After receiving a message indicating topology changes of a lower-layer network, a device on an
upper-layer network sends TC packets locally to instruct the other devices to clear associated
Issue 01 (2011-07-15)
port hybrid tagged vlan 30 100
stp disable
sep segment 3
#
return
Configuration file of CE1
#
sysname CE1
#
vlan batch 100
#
interface GigabitEthernet1/0/1
port hybrid tagged vlan 100
#
return
Configuration file of CE2
#
sysname CE2
#
vlan batch 200
#
interface GigabitEthernet1/0/1
port hybrid tagged vlan 200
#
return
NOTE
In this example, devices at the aggregation layer run the MSTP protocol.
Figure 10-13, multiple Layer 2 switching devices form a ring at the access layer,
When there is no faulty link on the ring network, SEP helps to eliminate loops.
When a link fault occurs on the ring network, SEP helps to rapidly restore the
communication between nodes.
The function of advertising topology changes should be configured on an edge device in a
SEP segment. This helps an upper-layer network to detect topology changes of a lower-
layer network in time.
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