6 Gbps of data.
EtherChannel
Improving Performance with Spanning Tree 45
Redundant Topology
Redundant topology can be accomplished using multiple links, multiple devices, or both.
The key is to provide multiple pathways and eliminate a single point of failure. Figure 2-16
shows a simple redundant topology between segment 1 and segment 2.
Figure 2-16 Redundant Topology
Although redundant designs can eliminate the possibility of a single point of failure causing
a loss of function for the entire switched or bridged network, you must consider problems
that redundant designs can cause. Some of the problems that can occur with redundant links
and devices in switched or bridged networks are as follows:
?– Broadcast storms: Without some loop-avoidance process in operation, each switch or
bridge ?¬‚oods broadcasts endlessly. This situation is commonly called a broadcast
storm.
?– Multiple frame transmission: Multiple copies of unicast frames may be delivered to
destination stations. Many protocols expect to receive only a single copy of each
transmission. Multiple copies of the same frame can cause unrecoverable errors.
?– MAC database instability: Instability in the content of the MAC address table results
from copies of the same frame being received on different ports of the switch.
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