Configuring The Preemption Mode - Huawei Quidway S7700 Configuration Manual - Ethernet
Smart routing switch
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Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet
l middle specifies the interface in the middle of the SEP segment as the blocked interface.
l hop specifies the interface that is hop-id hops away from the primary edge interface as the
l sysname+interface specifies the name of the device where the interface to be blocked
For information on how to select an interface blocking mode, see the preceding table.
----End
Follow-up Procedure
If the interface that has the highest priority is specified to block, run the sep segment segment-
id priority priority command in the view of the interface to be blocked to increase its priority.
When a fault is rectified, the specified interface will be blocked.
The default priority of an interface added to a SEP segment is 64. The priority value of an
interface is an integer ranging from 1 to 128. The greater the priority value, the higher the priority.
10.3.3 Configuring the Preemption Mode
The SEP preemption mode is classified into delay preemption and manual preemption.
Context
After the interface blocking mode is specified, whether the specified interface will be blocked
is determined by the preemption mode.
Table 10-10 Preemption mode
Preemption
Mode
Non-preemption
mode
Issue 01 (2011-07-15)
blocked interface.
If hop-id is set to 1, it indicates that the blocked interface is the primary edge interface. If
hop-id is set to 2, it indicates that the blocked interface is the neighboring interface of the
primary edge interface. The hop count increases along with the number of downstream
neighbors of the primary edge interface.
resides.
Advantage
SEP is in the non-
preemption mode by
default.
In this mode, blocking an
interface does not
disconnect any link in a
SEP segment.
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Table 10-10
lists the preemption modes.
Disadvantage
The blocked interface is one of the last two
interfaces that complete neighbor
negotiation.
10 SEP Configuration
514
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