Ring
Network
Protocol
Advantage Disadvantag
e
Deployment
Scenario
SEP
l SEP is a private protocol of
Huawei. It boasts short
convergence time (less
than 50 ms). Huawei
devices running SEP can
communicate with non-
huawei devices running
other types of ring
protocols.
l SEP supports various types
of networking modes. For
example, a network
running SEP can
communicate with a
network running STP,
RSTP, MSTP, or RRPP.
SEP supports all topologies
and the display of network
topologies.
The blocked interface,
therefore, can be quickly
located. When a fault
occurs, SEP can quickly
locate the fault, improving
network maintainability.
l SEP supports various
policies for specifying an
interface to block. This
allows the implementation
of traffic load balancing.
l
The
devices on
a SEP-
enabled
network
must be
Huawei
datacom
devices.
l On a SEP
network,
after
network
convergen
ce, a
specified
interface is
blocked to
prevent
data traffic
from
passing
through the
interface,
even if the
link where
the
interface
resides is a
direct link.
It is applicable to Layer
2 networks that have a
high requirement on
convergence time.
Definitions
The SEP protocol is a dedicated link layer protocol for use on Ethernet ring networks. A SEP
segment is the basic unit of the protocol. A SEP segment is composed of multiple interconnected
Layer 2 switching devices that are configured with the same SEP segment ID and control VLAN
ID.
Only two interfaces on a Layer 2 switching device can be added to the same SEP segment. In a
SEP segment, loops can be prevented by starting a protection mechanism to selectively block
certain interfaces and eliminate Ethernet redundant links. When a fault occurs on a ring network,
a device running SEP can quickly unblock the blocked interface to perform link switching. This
maintains normal communication between nodes on the ring network.
Figure 10-1 shows a typical SEP application. CE1 is connected to NPEs through a closed-ring
formed by switches. A VRRP backup group is deployed on the NPEs. Initially, the status of
NPE1 is master and the status of NPE2 is backup. When the link between NPE1 and LSW5 or
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.
489
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