430
Precautions in using loop detection function
– Disable loop detection at upstream port(s)
If a network is consisted of only Switching Hubs 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 the switching hub settings.
Fig. 2 Precautions in using loop detection function
Downstream
switching hub
2
Downstream
switching
hub 1
Upstream
switching
hub
PC 1
PC 2
PC 3
(1)
(2)
(3)
[Conditions of occurrence]
(1) Communications between PC1 and PC2, and between PC1 and PC3.
(2)A loop occurs in downstream switching hub 2.
(3)The upstream switching hub detects the loop first, and blocks the uplink port of
downstream switching hub 2. (Normally, only a port having loop connection is shut
down.)
(4)The uplink port of downstream switching hub 2 is linked down, and communications
to all other switching hubs are blocked.
(4)
Содержание PN28480K-ID
Страница 25: ...25 4 Switch Contact Shows the Switching Hub s current contact information ...
Страница 57: ...57 Parameter name Note None ...
Страница 91: ...91 Setting Range Parameter name Setting range None None Note Parameter name Note None None ...
Страница 155: ...155 Note Parameter name Note MAC addr None interface name None VLAN ID Set an existing VLAN ID ...
Страница 282: ...282 Local The value of Re auth Period of this device is always used ...
Страница 288: ...288 force authorized force unauthorized ...
Страница 337: ...337 disabled a b i u center right left font h1 to h5 div span br p ...
Страница 381: ...381 Note Parameter name Note ID None Name None PortList None ...
Страница 386: ...386 ...
Страница 427: ...427 Appendix A Specifications Refer to Operation Manual Menu Screens for your Switching Hub to read the specifications ...
Страница 432: ...432 ifOutQLen RO ifOutQLen port_num ifSpecific RO ifSpecific port_num ...