03-18-2007 03:10 AM - edited 03-05-2019 02:58 PM
Hi
what is the best config to ports on the Cisco Switch regarding Duplex & Speed;is auto config to both of them?OKK?
10XS
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03-18-2007 03:16 AM
Hi Ali
The answer is it depends. If you are connecting servers and clients then as long as they are also set to auto neogitiate you should be fine.
Where i work we leave clients on auto-negotiation, any servers that are a 100full capable we set to 100full on the switch and gigabit server connectikns should be left at auto.
I have seen many problems with incorrect speed/duplex settings. The key thing is to make sure that the network people who set up the switches and the server/desktop people are all communicating.
Between switches you cause auto.
HTH
Jon
03-18-2007 03:12 AM
HI Ali
It will be fine if u r having auto at both the ends.
Thanks
Mahmood
03-18-2007 03:15 AM
hi Mahmoud!
what about if these ports
10xs
03-18-2007 03:16 AM
Hi Ali
The answer is it depends. If you are connecting servers and clients then as long as they are also set to auto neogitiate you should be fine.
Where i work we leave clients on auto-negotiation, any servers that are a 100full capable we set to 100full on the switch and gigabit server connectikns should be left at auto.
I have seen many problems with incorrect speed/duplex settings. The key thing is to make sure that the network people who set up the switches and the server/desktop people are all communicating.
Between switches you cause auto.
HTH
Jon
03-18-2007 03:46 AM
Hi Jon/Hi Mahmood!
Thanks a lot for ur reply specialy in this off days
Regards
03-19-2007 01:34 AM
Hi Ali,
I Just have one comment to add:
If a switch port is configured with 100Mbps and Full Duplex (auto-negotiation is disabled -> no FLPs are sent), but the Workstation's NIC is configured for auto-negotiation --> Without auto-negotiation on the switch, FLPs (Fast Link Pulses) will not be sent to the workstation, and as a result, the workstation will configure itself to half-duplex (FLP was used to negotiate both speed and duplex), which can result in Duplex mismatch.
Switches detect duplex settings through auto-negotiation only. If both ends have auto-negotiation enabled, the duplex is negotiated. However, if either device on the cable disables auto-negotiation, the devices without a configured duplex setting must assume a default. Cisco switches use a default duplex setting of half duplex (HDX) (for 10-Mbps and 100-Mbps interfaces) or full duplex (FDX) (for 1000-Mbps interfaces -> Always Full can't be Half).
Duplex mismatch is a situation in which the switch is operating at full-duplex and the connected device is operating at half-duplex, or the other way around. The result of a duplex mismatch is extremely slow performance, intermittent connectivity, and loss of connection.
NOTE: If auto-negotiation is disabled on either end of the cable, the switch detects the speed anyway based on the incoming electrical signal.
Accordingly this is a thing that you need to consider in your network --> Either to make both sides Auto, or configure both sides explicitly to avoid any Duplex mismatch problems.
HTH and best regards,
Mohammed Mahmoud.
03-19-2007 02:41 AM
Another adding if i may...
If the switches ar config for auto a trunk won't be negotiated cause both switches are waiting for the ohter to start the negotiation...
I have also had an issue that i had to config my router which only had 10 mb interfaces like this...
on the routers - duplex full
on the switches - speed 10 and duplex on auto
ciao flash
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