Cisco Catalyst 3560-X Software Configuration Manual page 626
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Also See for Catalyst 3560-X:
- Command reference manual (1188 pages) ,
- Software configuration manual (1438 pages) ,
- Manual (276 pages)
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Understanding REP
Figure 1-1
REP Open Segments
E1
The segment shown in
ports. The REP segment cannot cause a bridging loop and it is safe to 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 failure
causes a host to be unable to access its usual gateway, REP unblocks all ports to ensure that connectivity
is available through the other gateway.
The segment shown in
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 1-2
REP segments have these characteristics:
•
•
•
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
1-2
E2
E1
Figure 1-1
Figure
1-2, with both edge ports located on the same switch, is a ring segment.
REP Ring Segment
E1
E2
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.
is an open segment; there is no connectivity between the two edge
Chapter 1
Configuring Resilient Ethernet Protocol
Edge port
E1
Blocked port
Link failure
E2
OL-25303-03
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Troubleshooting
