Cisco Catalyst 3560-X Series, Software Configuration Manual

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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring Resilient Ethernet Protocol
Configuring REP
•
REP sends all LSL PDUs in untagged frames on the native VLAN. The BPA message sent to the
Cisco multicast address is sent on the administration VLAN, which is VLAN 1 by default.
• You can configure how long a REP interface remains up without receiving a hello from a neighbor.
You can use the
rep lsl-age-time r value interface configuration command to set the time from
3000 ms to 10000 ms. The LSL hello timer is then set to the age-timer value divided by 3. In normal
operation, three LSL hellos are sent before the age timer on the peer switch expires and checks for
hello messages.
•
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.
Configuring the 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.
To configure the REP administrative VLAN, follow these steps, beginning in privileged EXEC mode:
Command Purpose
Step 1 configure terminal Enters global configuration mode.
Step 2 rep admin vlan vlan-id Specifies the administrative VLAN. The range is 2 to
4094. The default is VLAN 1. To set the admin VLAN to
1, enter the
no rep admin vlan global configuration
command.
Step 3
end Returns to privileged EXEC mode.
Step 4
show interface [ interface-id ] rep detail Verifies the configuration on one of the REP interfaces.
Step 5 copy running-config startup config (Optional) Saves your entries in the switch startup
configuration file.