MediaMatrix nTouch 60 Instrukcja Obsługi Pobierz pdf (Strona 72)

Appendix A - Troubleshooting

68 Version 1.6.2a.0 May 17, 2011

To put it in audio terms, a network loop is analogous to an audio feedback loop. The screech

one hears in audio feedback is due to continuous positive reinforcement of the signal. A

network loop causes a similar positive reinforcement of the data. Data packets are replicated

and increase in quantity with each hop through a switch until all available network bandwidth

is consumed.

Many Ethernet switches contain some variant of the Spanning Tree Protocol (STP, RSTP or

MSTP) that detects and logically removes loops. Standard STP should not allow a connection

to be made until it is sure that the connection will not cause a loop. MSTP and RSTP can

behave a little differently. If a new connection is made through a port that the protocol

previously considered to be an edge port. (i.e. it cannot be connected to another switch), then

the port will be immediately enabled. If this connection is such that it can create a loop, then a

data storm can occur. Explicitly setting ports within an RSTP/MSTP managed switch to be

edge or bridge ports, per their usage, may alleviate this problem.

Commonly used fault tolerant techniques for CobraNet networks

 Intentional creation of a loop, with reliance on STP to remove it, in order to create a spare

connection that will be automatically activated when a link in the network goes down.

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