[Router1] sep segment 1
[Router1-sep-segment1] block port optimal
[Router1-sep-segment1] quit
# On Router3, set the priority of GE7/0/4 to 128, which is the highest priority among the
interfaces so that GE7/0/4 will be blocked.
[Router3] interface gigabitethernet 7/0/4
[Router3-GigabitEthernet7/0/4] sep segment 1 priority 128
[Router3-GigabitEthernet7/0/4] quit
Retain the default priority of the other interfaces in SEP segment 1.
# On Router2 where the primary edge interface of SPE segment 2 is located, specify the
device and interface names so that the specified interface will be blocked.
Before specifying the interface to block, use the display sep topology command to view
the current topology information and obtain information about all the interfaces in the
topology. Then specify the device and interface names.
[Router2] sep segment 2
[Router2-sep-segment2] block port sysname Router7 interface gigabitethernet
7/0/1
[Router2-sep-segment2] quit
# On Router4 where the primary edge interface of SEP segment 3 is located, specify the
blocked interface based on the configured hop count.
[Router4] sep segment 3
[Router4-sep-segment3] block port hop 5
[Router4-sep-segment3] quit
NOTE
SEP sets the hop count of the primary edge interface to 1 and the hop count of the secondary edge
interface to 2. Hop counts of other interfaces increase by steps of 1 in the downstream direction of
the primary interface.
4. Configure the preemption mode.
# Configure delayed preemption on Router1.
[Router1] sep segment 1
[Router1-sep-segment1] preempt delay 30
NOTE
l You must set the preemption delay when delayed preemption is used because there is no default
delay time.
l When the last faulty interface recovers, edge interfaces do not receive any fault notification
packet. If the primary edge interface does not receive any fault notification packet, it starts the
delay timer. When the delay timer expires, nodes in the SEP segment start blocked interface
preemption.
To implement delayed preemption in this example, simulate a port fault and then rectify the fault.
For example:
Run the shutdown command on GE7/0/1 of Router2 to simulate an interface fault, and then run
the undo shutdown command on GE7/0/2 to rectify the fault.
# Configure manual preemption on Router2.
[Router2] sep segment 2
[Router2-sep-segment2] preempt manual
# Configure the manual preemption mode on Router4.
[Router4] sep segment 3
[Router4-sep-segment3] preempt manual
5. Configure the topology change notification function.
# Configure devices in SEP segment 2 to notify SEP segment 1 of topology changes.
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.
324
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