1G full configuration in the interface of the ASA 5545-x

[bensonlei]

Hi, Guys,

My ASA 5545-x is running 9.4.4 (5).

I can not configure the ASA 5545-x interfaces, any help ?

fw(config)# int gi1/3
fw(config-if)# speed 1000
fw(config-if)# duplex full
                            ^
ERROR: % Invalid input detected at '^' marker.

Thanks a lot

[nspasov]

A couple of questions:

1. Are you trying to set the duplex on the fiber or copper interface?

2. What is the reason for forcing the speed and duplex? I ask this because it is best practice to let those auto-negotiate. 

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[bensonlei]

Hi, nspasov,

1. 1G full is SFP SX port ( for my situation ).

2.  It is due to we find some packet loss if using speed & duplex auto, so we want set all network devices interfaces for fixed speed and duplex full ( which improve the interfaces performance in fact)..

Thx a lot.

[nspasov · Accepted solution]

#1 - Fiber ports on ASAs (and probably most Cisco gear is full-duplex only). A typical fiber run has a dedicated strand for transmitting and a dedicated strand for receiving. Thus, there should be no scenarios where you would want half-duplex on those interfaces.

#2 - It is always recommended to let interfaces auto-negotiate the duplex and speed. If you have interfaces that are falling to half-duplex or lower speeds, then you need investigate and remediate the problem. 

Thank you for rating helpful posts!