PurposeCommand or Action
Although each segment can have only one primary edge port, if you
configure edge ports on two different switches and enter the primary
keyword on both switches, the configuration is valid. However, REP selects
only one of these ports as the segment primary edge port. You can identify
the primary edge port for a segment by entering the show rep topology
privileged EXEC command.
Note
•
(Optional) preferred-Indicates that the port is the preferred alternate port or
the preferred port for VLAN load balancing.
Configuring a port as preferred does not guarantee that it becomes the
alternate port; it merely gives the port a slight edge over equal contenders.
The alternate port is usually a previously failed port.
Note
Configuration Examples for REP
Configuring the REP Administrative VLAN
This example shows how to configure the administrative VLAN as VLAN 100.
Router# configure terminal
Router(config)# rep admin vlan 100
Router(config-if)# end
Configuring REP Support on a Trunk EFP
This example shows how to configure REP support on a Trunk EFP. An interface is configured as the primary
edge port for segment 1 to send STCNs to segments 2 through 5; the alternate port is configured as the port
with port ID 0009001818D68700 to block all VLANs after a preemption delay of 60 seconds after a segment
port failure and recovery.
Router# configure terminal
Router(config)# interface gigabitethernet0/0/1
Router(config-if)# rep segment 1 edge primary
Router(config-if)# rep stcn segment 2-5
Router(config-if)# rep block port id 0009001818D68700 vlan all
Router(config-if)# rep preempt delay 60
Router(config-if)# service instance trunk 1 ethernet
Router(config-if-srv)# encapsulation dot1q
Router(config-if-srv)# rewrite ingress tag pop 1 symmetric
Router(config-if-srv)# bridge-domain from-encapsulation
Router(config-if-srv)# end
This example shows how to configure the VLAN blocking configuration as shown in the figure below. The
alternate port is the neighbor with neighbor offset number 4. After manual preemption, VLANs 100 to 200
LAN Switching Configuration Guide Cisco IOS XE Everest 16.5.1 (Cisco ASR 900 Series)
32
Configuring Resilient Ethernet Protocol
Configuration Examples for REP
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