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Configuring Resilient Ethernet Protocol
How to Configure REP
— EtherChannel port channel interfaces do not support LSL age-timer values less than 1000 ms. If you try to
configure a value less than 1000 ms on a port channel, you receive an error message and the command is
rejected.
When configuring the REP LSL age timer, make sure that both ends of the link have the same time value configured.
Configuring different values on ports at each end of the link results in a REP link flap.
REP ports cannot be configured as one of these port types:
— SPAN destination port
— Tunnel port
— Access port
REP is supported on EtherChannels, but not on an individual port that belongs to an EtherChannel.
There is a maximum of 64 REP segments per switch.
REP Administrative VLAN
To avoid the delay introduced by relaying messages in software for link-failure or VLAN-blocking notification during load
balancing, REP floods packets at the hardware flood layer (HFL) to a regular multicast address. These messages are
flooded to the whole network, not just the REP segment. You can control flooding of these messages by configuring an
administrative VLAN for the whole domain.
Follow these guidelines when configuring the REP administrative VLAN:
If you do not configure an administrative VLAN, the default is VLAN 1.
There can be only one administrative VLAN on a switch and on a segment. However, this is not enforced by software.
The administrative VLAN cannot be the RSPAN VLAN.
How to Configure REP
Configuring the REP Administrative VLAN
Configuring REP Interfaces
Before You Begin
For REP operation, you need to enable it on each segment interface and identify the segment ID. This step is required
and must be done before other REP configuration. You must also configure a primary and secondary edge port on each
segment. All other steps are optional.
Command Purpose
1. configure terminal Enters global configuration mode.
2. rep admin vlan vlan-id Specifies the administrative VLAN. The range is 2 to
4096. The default is VLAN 1. To set the admin VLAN to 1,
enter the no rep admin vlan global configuration
command.
3. end Returns to privileged EXEC mode.
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