hi every body!
i understand that on gigabitethernet link, default duplex setting is full.
how about if sw1---------------sw2
f 10/100 f 100/1000
where sw1 has following configuration :
sw1# speed 100
will sw2 default to full duplex?
thanks a lot!
fiber based GBICs are full duplex in their nature: they have two fibers one is TX and one is RX so with them there is nothing to be negotiated (well limited to speed and duplex ... there is also flowcontrol ...)
speed is fixed to 1000 Mbps
duplex is full
You don't need and you actually cannot set speed or duplex on a GE port using a GBIC (at least on a lan switch an execption could be the GE ports of NPE-G1 and NPE-G2 for 7206VXR that have at the same type the rj45 and the gbic slot in that case you need to define the media-type also)
on a switch with built-in RJ-45 port that is a 10/100/1000. I think there is also a GBIC with RJ45 output in that case the port is not capable of negotiation and behaves like fiber based GBICs is 1000 Mbps full.
Hope to help
sw2 which has gigabit port will default to full
The answer is, it depends. A device set to auto/auto will expect its neighbor device be set to auto/auto. When a device expects autonegotiation information from its remote device and it does not receive it, the safe mode is to set itself to half-duplex.
This wiki page contains useful information:
it depends from what devices are at the two ends of link.
In a real world scenario the better choices are:
both ends manually configured the same
both ends auto
other choices lead to errors
Hope to help