Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB
OL-21227-02
Chapter 1 Cisco MWR 2941 Router Overview
Features
Figure 1-2 REP Open Segments
Figure 1-2 shows an open segment; there is no connectivity between the two edge ports. The REP
segment cannot cause a bridging loop, and you can safely connect the segment edges to any network.
All hosts connected to switches inside the segment have two possible connections to the rest of the
network through the edge ports, but only one connection is accessible at any time. If a host cannot access
its usual gateway because of a failure, REP unblocks all ports to ensure that connectivity is available
through the other gateway.
Figure 1-3 shows a segment with both edge ports located on the same switch, is a ring segment. In this
configuration, there is connectivity between the edge ports through the segment. With this configuration,
you can create a redundant connection between any two switches in the segment.
Figure 1-3 REP Ring Segment
REP segments have these characteristics:
• If all ports in the segment are operational, one port (referred to as the alternate port) is in the blocked
state for each VLAN.
• If VLAN load balancing is configured, two ports in the segment control the blocked state of VLANs.
• If one or more ports in a segment is not operational, causing a link failure, all ports forward traffic
on all VLANs to ensure connectivity.
• In case of a link failure, the alternate ports are unblocked as quickly as possible. When the failed
link comes back up, a logically blocked port per VLAN is selected with minimal disruption to the
network.
E2E1 E2E1
E1
Edge port
Blocked port
Link failure
201888
E2E1
201889