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Precautions in using loop detection function
– Disable loop detection at upstream port(s)
If a network is consisted of only Switching Hub equipped with loop detection function, an upstream
Switching Hub may detect on ahead and block a loop occurred in a downstream Switching
Hub. This may block all communications to the downstream Switching Hub.
To minimize the communication failure by loop detection, disable the loop detection function
of the upstream Switching Hub so that only a port of the Switching Hub causing loop will
be blocked. You need to examine this type of network configuration and Switching Hub settings.
Upstream Switching Hub
Downstream
Switching Hub 1
PC 1
[Conditions of occurrence]
(1) Communications between PC1 and PC2, and between PC1 and PC3 are OK.
(2) A loop occurs in downstream Switching Hub 2.
(3) The upstream Switching Hub detects the loop first, and shuts down the uplink port to downstream Switching Hub
2. (Normally, only a port having loop connection is shut down.)
(4) The uplink port to downstream Switching Hub 2 is linked down, and communications to all other Switching Hubs
are blocked.
Fig. 2 Precautions in using loop detection function
(3)
(1)
158
(4)
Downstream
Switching Hub 2
(2)
PC 2
PC 3
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