Huawei AR530 Series - Page 293

A SEP segment is a ring or linear Ethernet topology. Each SEP segment has a control
VLAN, edge interfaces, and common interfaces.
l Control VLAN
In a SEP segment, the control VLAN is used to transmit only SEP packets.
Each SEP segment must have a control VLAN. After an interface is added to a SEP segment
that has a control VLAN, the interface is automatically added to the control VLAN.
Different SEP segments can use the same control VLAN.
Different from a control VLAN, a data VLAN is used to transmit data packets.
l Node
Each Layer 2 switching device in a SEP segment is a node. Each node can have at most
two interfaces added to the same SEP segment.
l Interface role
As defined in SEP, there are two interface roles: common interfaces and edge interfaces.
As shown in Table 8-1, edge interfaces are further classified into primary edge interfaces,
secondary edge interfaces, no-neighbor primary edge interfaces, and no-neighbor
secondary edge interfaces.
NOTE
Normally, edge interfaces and no-neighbor edge interfaces belong to different SEP segments.
Table 8-1 Interface roles
Interface Role Sub-role Description
Edge interface Primary edge
interface
A SEP segment has only one primary edge
interface, which is determined by the
configuration and election.
The primary edge interface initiates
blocked interface preemption, terminates
packets, and sends topology change
notification messages to other networks.
Secondary edge
interface
A SEP segment has only one secondary
edge interface, which is determined by the
configuration and election.
The secondary edge interface terminates
packets and sends topology change
notification messages to other networks.
Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching 8 SEP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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