Interface Blocking
Mode
Description
Specifying the interface
in the middle of a SEP
segment as the blocked
interface
Is applicable to a network where traffic is symmetrically
distributed.
After fault recovery, the interface in the middle of a SEP
segment is designated as the blocked interface.
Specifying the blocked
interface based on the
configured hop count
Is applicable to a small-scale network.
After fault recovery, a specified interface can be blocked
based on the hop count. A network planner needs to be
familiar with the topology of the entire SEP segment and the
number of hops from the blocked interface to the primary-
edge interface.
Specifying the blocked
interface based on the
device name and
interface name
Is applicable to a small-scale network.
After fault recovery, a specified interface can be blocked
based on the device name and the interface name. A network
planner needs to be familiar with the names of devices and
interfaces on the entire SEP segment and ensures that each
device name is unique.
l Preemption
After the interface blocking mode is specified, whether the specified interface will be
blocked is determined by the preemption mode. Table 10-5 lists the preemption modes.
Table 10-5 Preemption mode
Preemption
Mode
Advantage Disadvantage
Non-preemption
mode
SEP is in the non-
preemption mode by
default.
In this mode, blocking
an interface does not
disconnect any link in a
SEP segment.
The blocked interface is one of the last
two interfaces that complete neighbor
negotiation.
Preemp
tion
mode
Delaye
d
preemp
tion
Each time a fault is
rectified, the system
automatically
completes preemption
and ensures that the
specified interface is
blocked.
l Related commands need to be used to
specify the delayed preemption mode
in advance. The preemption delay
does not have a default value, and
therefore related commands must be
used to set the preemption delay.
l After delayed preemption is
configured successfully, a fault needs
to be simulated to ensure that the
specified interface is blocked.
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.
501
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