Speed Mismatch between Switch port and Printer

[mahesh18]

Hi Everyone,

Switch is conencted to Printer through Patch Panel.

Printer is hard coded to speed of 100 and duplex is full

Switch o shard coded to Duplex full and speed of 10

With this settings the Switch port does not come up.

As soon as i change the speed of switch port to 100 the port comes up.

Need to know if this is default behaviour?

Thanks

Mahesh

[SOcchiogrosso · Accepted solution]

Your speed settings will need to match if they hard coded. Duplex mis-matches will result in a poor connection with collisions. However speed mis-matches will take the connection down.

Sent from Cisco Technical Support iPad App

[paul driver · Accepted solution]

Hello manesh

The settings you have show states that the interfaces are " hardcoded or manually set"

So you are telling the Printers interface that traffic can travel is 100mbs/full duplex - meaning at this speed the interface can send & receive traffic in either direction at the same time,

The Routers interface is set a 10mps/full duplex  - meaning at 10mbs the interface can send & receive traffic in either direction at the same time,

However speed mismatchs like above result in links not establishing as only one speed at he same rate is commomly supported  on directly connected interfaces like you have stated above.

Duplex settings are usually only hardcoded like above "after" the speed is manullay set, if you try to set duplex before the speed it wont allow you to do so.

Full Duplex mode =data can be sent in both directions at the same time
Half Duplex = data can be sent in only in one direction at a time.

Autonegotiation- is when you have two devices which can support various speeds and duplex settings.

This is commonly used when you would like the interfaces to choose this best speed/duplex and flow control, capabilities of either interface, however is one interface is "hardcoded" and the other is set to autonegotiation, usually the speed can be determined but the duplex setting gets dropped down to half duplex, resulting is slow performance and crc errors etc being reorted on the interfaces.

res

Paul

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[mahesh18]

Hi Paul,

Thanks for contributing your inputs to  my question.

Regards

Mahesh