3. Specify the port to block.
# On LSW1 where the primary edge port of SEP segment 1 is located, specify that the port
with the highest priority be blocked.
[LSW1] sep segment 1
[LSW1-sep-segment1] block port optimal
[LSW1-sep-segment1] quit
# On LSW3, set the priority of GE1/0/4 to 128, which is the highest priority among the
ports so that GE1/0/4 will be blocked.
[LSW3] interface gigabitethernet 1/0/4
[LSW3-GigabitEthernet1/0/4] sep segment 1 priority 128
[LSW3-GigabitEthernet1/0/4] quit
Use the default priority for the other ports in SEP segment 1.
# On LSW2 where the primary edge port of SPE segment 2 is located, specify the device
name and port name so that the specified port will be blocked.
Before specifying the port to block, you can use the display sep topology command to
view the current topology information and obtain information about all the ports in the
topology. Then you can select the device name and port name.
[LSW2] sep segment 2
[LSW2-sep-segment2] block port sysname LSW7 interface gigabitethernet 1/0/1
[LSW2-sep-segment2] quit
# On LSW4 where the primary edge port of SEP segment 3 is located, specify that the
blocked port be selected according to the configured hop counts of ports.
[LSW4] sep segment 3
[LSW4-sep-segment3] block port hop 5
[LSW4-sep-segment3] quit
NOTE
SEP sets the hop count of the primary edge port to 1 and the hop count of the secondary edge port
to 2. Hop counts of other ports increase at a step of 1 in the downstream direction of the primary port.
4. Configure the preemption mode.
# Configure the delayed preemption mode on LSW1.
[LSW1] sep segment 1
[LSW1-sep-segment1] preempt delay 30
NOTE
l You must set the preemption delay when delayed preemption is adopted because there is no
default delay time.
l After all the faulty ports recover, the edge ports no longer receive fault notification packets. If
the primary edge port does not receive any fault notification packet, it starts the delay timer.
When the delay timer expires, nodes in the SEP segment start blocked port preemption.
To implement delayed preemption in this example, you need to simulate a port fault and then
rectify the fault. For example:
Run the shutdown command on GE1/0/2 of LSW2 to simulate a port fault, and then run the
undo shutdown command on GE1/0/2 to rectify the fault.
# Configure the manual preemption mode on LSW2.
[LSW2] sep segment 2
[LSW2-sep-segment2] preempt manual
# Configure the manual preemption mode on LSW4.
[LSW4] sep segment 3
[LSW4-sep-segment3] preempt manual
5. Configure the topology change notification function.
# Configure SEP segment 2 to notify SEP segment 1 of topology changes.
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.
536
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