Asset ID:	1-71-1009114.1
Update Date:	2009-09-15
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1009114.1 :   Sun[TM] B1600:Tech Tip:Automatic MDI/MDIX switchover capability in B1600 switch.  


PreviouslyPublishedAs
212596

Description
The intent of this document is to give information on MDI/MDIX switchover
capability in B1600 switch and its relationship to autonegotiation.

Steps to Follow

Standard wiring on an end station (host) is known as Medium Dependent
Interface (MDI). The wiring on the switch is opposite to that of the end
station and is called Medium Dependent Interface Crossover (MDIX).
Normally for the link to get established between 2 switches or between 2
hosts (in otherwords, between like devices) a crossover cable is used. A
straight through cable is used to connect a host to a switch.
Many of the newer devices have the capability to detect the cable type and
to automatically switchover from MDI to MDIX or vice-versa. This capability
is called autoswitching or automatic crossover.
B1600 incorporates this autoswitching capablity and this feature is enabled
by default.  This means that the link gets established between a B1600
switch and another device (could be switch or host) irrespective of the
type of cable used. However, this autoswitch capabiity gets turned off when
autonegotiation is disabled. This means that with autonegotiation disabled,
it is a must to use a crossover cable between B1600 switch and another
"like device" such as a switch or hub.
It is important to note that MDI/MDIX autoswitching and autonegotiation are two
different and independent features. It is just that the B1600 switches are
programmed such that the autoswitching capability is turned on  when
autonegotiation is enabled and gets turned off when autonegotiation is
disabled.

Product
Sun Fire B1600 Blade System Chassis

Internal Comments
co-author: Viswa.Nath@sun.com

stiletto, B1600, Accton switch, autonegotiation, autoswitch
Previously Published As
74353

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Product_uuid
10bec5e4-5865-11d6-9ffc-c65b6cd3fd7d|Sun Fire B1600 Blade System Chassis

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