Configuration Examples; Example For Configuring Sep On A Closed Ring Network - Huawei Quidway S7700 Configuration Manual - Ethernet

Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
Context
Debugging affects the performance of the system. So, after debugging, run the undo debugging
all command to disable it immediately.
Procedure
Step 1 Run the debugging sep { all | common | error | machine | message | pdu [ [ epa | lsa | nbr |
preempt ] [ transmit | receive ] ] } [ segment segment-id | interface interface-type interface-
number ] command in the user view to debug SEP.
----End

10.7 Configuration Examples

This section describes the networking requirements, configuration roadmap, and data
preparation for a typical SEP application and provides the configuration examples.

10.7.1 Example for Configuring SEP on a Closed Ring Network

In the closed ring networking, CE1 is dual homed to a Layer 2 network through multiple Layer
2 switching devices. The two edge devices connected to the upper-layer Layer 2 network are
directly connected to each other. The closed ring network is deployed at the aggregation layer
to implement Layer 2 transparent transmission of unicast and multicast packets. SEP runs at the
aggregation layer to implement link redundancy.
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
this networking mode:
l
Issue 01 (2011-07-15)
CAUTION
Figure 10-11, Layer 2 switching devices LSW1 to LSW5 form a ring network. In
SEP runs at the aggregation layer. When the ring network is functioning properly, SEP
blocks the redundant Ethernet links. When a link on the ring fails, SEP can quickly restore
communication between the nodes on the ring.
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