Specifications
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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
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Chapter 14 Configuring Resilient Ethernet Protocol
Configuring Resilient Ethernet Protocol (REP)
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If only one port on a switch is configured in a segment, the port should be an edge port.
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If two ports on a switch belong to the same segment, they must be both edge ports, both regular
segment ports, or one regular port and one edge no-neighbor port. An edge port and regular
segment port on a switch cannot belong to the same segment.
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If two ports on a switch belong to the same segment and one is configured as an edge port and
one as a regular segment port (a misconfiguration), the edge port is treated as a regular segment
port.
• REP interfaces come up and remain in a blocked state until notified that it is safe to unblock. You
need to be aware of this to avoid sudden connection losses.
• 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-timer value interface configuration command to set the time from 120
ms to 10000 ms. The LSL hello timer is then set to the age-timer value divided by three. In normal
operation, three LSL hellos are sent before the age timer on the peer switch expires and searches for
hello messages.
• You can configure how long a REP interface remains up without receiving a hello from a neighbor.
You can use the rep lsl-age-timer value interface configuration command to set the time from 120
ms to 10000 ms. The LSL hello timer is then set to the age-timer value divided by three. In normal
operation, three LSL hellos are sent before the age timer on the peer switch expires and searches for
hello messages.
• REP ports cannot be configured as one of these port types:
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SPAN destination port
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Private VLAN
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Tunnel port
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Access port
• 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.