Is there an advantage to hard code fast ethernet to 100 full as opposed to auto half?

[admin_2]

I have a 2620 fast ethernet dirrectly connected to 2912xl fast ethernet switch and right now it is set for :

interface FastEthernet0/0

ip address 10.10.x.x 255.255.255.128

no ip directed-broadcast

speed auto

half-duplex

Is there any reason why I could not or should not hard code the router's fast ethernet interface to

speed 100

and

duplex full

?

[#2]

No, no reason at all. If your switch

is 100M, then you should go ahead and

configure it.

[bsivasub]

2600 and 2924XL should be able to auto-negotiate speed/duplex. So I suggest let it auto-negotiate to 100-full. IF the 260 is a router on a stick and all inter-vlan traffic has to go through this link, half-duplex would result in excessive collision which would slow down the traffic. So always use full duplex setting regardless what the speed is.

[scottmac]

Auto-negotiate is not always reliable. For ANY critical link (or IMHO, EVERY link), you should hard code the parameters. If it's a 100 meg link, unless you have a specific reason not to, you should be at full duplex.

Do you really want to leave the operation of your network in the hands of a PROGRAMMER (the guy that wrote the op code for your equipment)?

Auto is for people to lazy or stupid to know what is plugging into their network (IMHO).

FWIW

Scott

[bsivasub]

between cisco devices auto-negotiating should work unless you are hitting into a bug !! I agree you can't beat the hard-coding part unless ofcource the admin makes a mistake. I think the probabilty of you hitting into auto-neg bug between two cisoc devices in this case is far far less then an accidental mistake.

I typically leave cisco to cisco to auto. :)

[scottmac]

Auto-negotiate is not always reliable. For ANY critical link (or IMHO, EVERY link), you should hard code the parameters. If it's a 100 meg link, unless you have a specific reason not to, you should be at full duplex.

Do you really want to leave the operation of your network in the hands of a PROGRAMMER (the guy that wrote the op code for your equipment)?

Auto is for people too lazy or stupid to know what is plugging into their network (IMHO).

FWIW

Scott