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7.1 | |
Redundant Topologies | |
| 7.1.5 | |
Multiple frame transmissions |
In a redundant switched network it is
possible for an end device to receive multiple frames.
 Assume that the MAC address of Router Y has been timed out by both switches. Also assume that Host X still has the MAC address of Router Y in its ARP cache and sends a unicast frame to Router Y. The router receives the frame because it is on the same segment as Host X. Switch A does not have the MAC address of the Router Y and will therefore flood the frame out its ports. Switch B also does not know which port Router Y is on. Switch B then floods the frame it received causing Router Y to receive multiple copies of the same frame. This is a cause of unnecessary processing in all devices.
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