Table 8-8 SEP topology change notification
SEP
Topology
Change
Notification
Scenario Description Solution
Topology
change
notification
from a lower-
layer network
to an upper-
layer network
A SEP network is
connected to an
upper-layer network
running other
features such as SEP
and STP.
l If the blocked interface
on a lower-layer SEP
network is manually
changed, the topology of
the SEP segment
changes. Because the
upper-layer network is
unable to detect the
change in topology,
traffic is interrupted.
l If an interface on a lower-
layer SEP network
becomes faulty, the
topology of the SEP
segment changes but the
upper-layer network is
unable to detect the
change. As a result,
traffic is interrupted.
Configure the SEP
topology change
notification
function.
Suppression of SEP TC Notification Packets
Topology changes of a SEP segment are advertised to other SEP segments or upper-layer
networks. A large number of topology change (TC) notification packets are generated in the
following cases:
l A link becomes disconnected transiently.
l A SEP segment is attacked by invalid TC notification packets.
l There are multiple SEP ring networks.
Figure 8-5 shows a networking scenario with three SEP ring networks. If the topology of
SEP segment 3 changes, the number of TC notification packets doubles and SEP segment
2 is flooded with these packets. Each time TC notification packets pass through a SEP
segment, the number of TC notification packets doubles.
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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