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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 12 Configuring Resilient Ethernet Protocol
Configuring Resilient Ethernet Protocol (REP)
Step 5
rep segment segment-id [edge [no-neighbor]
[primary]] [preferred]
Example:
Router(config-if)# rep segment 1 edge
preferred
Enables REP on the interface, and identifies a segment number. The
segment ID range is from 1 to 1024.
Note You must configure two edge ports, including one primary
edge port for each segment.
These are the optional keywords:
• Enter the edge keyword to configure the port as an edge port.
Entering edge without the primary keyword configures the
port as the secondary edge port. Each segment has only two
edge ports.
• (Optional) Enter the no-neighbor keyword to configure a port
with no external REP neighbors as an edge port. The port
inherits all properties of edge ports, and you can configure them
the same as any edge port.
• On an edge port, enter the primary keyword to configure the
port as the primary edge port, the port on which you can
configure VLAN load balancing.
Note 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 allowed. 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.
• Enter the preferred keyword to indicate that the port is the
preferred alternate port or the preferred port for VLAN load
balancing.
Note Configuring a port as preferred does not guarantee that it
becomes the alternate port; it merely gives it a slight edge
among equal contenders. The alternate port is usually a
previously failed port.
Step 6
rep lsl-retries number-of-retries
Example:
Router(config-if)# rep lsl-retries 4
Use the rep lsl-retries command to configure the REP link status
layer (LSL) number of retries before the REP link is disabled.
Step 7
rep stcn {interface
interface-id
|
segment
id-list
| stp}
Example:
Router(config-if)# rep stcn segment 2-5
(Optional) Configures the edge port to send segment topology
change notices (STCNs).
• Enter interface interface-id to designate a physical Layer 2
interface or port channel to receive STCNs.
• Enter segment id-list to identify one or more segments to
receive STCNs. The range is from 1–1024.
• Enter stp to send STCNs to STP networks.
Command Purpose