On a 3825 can I use the SFP and the fixed lan ports at the same time?

Answered Question
May 26th, 2010

On a 3825 can I use the SFP and the fixed lan ports at the same time?

I have this problem too.
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Correct Answer by Giuseppe Larosa about 6 years 6 months ago

Hello Mark,

the answer is no

I did a test on a C3825

on int g0/0 there is the media-type command with options rj45 or sfp

on int gi0/1 there is the media-type command only with option rj45

router(config)#int gi0/1

router(config-if)#med

router1(config-if)#media-type ?

  rj45  Use RJ45 connector

 

router(config-if)#int gi0/0 

router1(config-if)#med 

router1(config-if)#media-type ?

  rj45  Use RJ45 connector

  sfp   Use SFP connector

 

this means the SFP is linked to g0/0 and that you can use one SFP and one RJ45 port at the same time

Hope to help

Giuseppe

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Correct Answer
Giuseppe Larosa Wed, 05/26/2010 - 11:55

Hello Mark,

the answer is no

I did a test on a C3825

on int g0/0 there is the media-type command with options rj45 or sfp

on int gi0/1 there is the media-type command only with option rj45

router(config)#int gi0/1

router(config-if)#med

router1(config-if)#media-type ?

  rj45  Use RJ45 connector

 

router(config-if)#int gi0/0 

router1(config-if)#med 

router1(config-if)#media-type ?

  rj45  Use RJ45 connector

  sfp   Use SFP connector

 

this means the SFP is linked to g0/0 and that you can use one SFP and one RJ45 port at the same time

Hope to help

Giuseppe

markmarek Wed, 07/14/2010 - 11:40

I am replacing a router with 3 lan interfaces and going to a router with 2 lan interfaces. My problem is that I need to keep all three networks separate.

I was thinking about using subinterfaces and then on the switches creating a trunk port and using private vlans to keep the traffic separated between the three networks.

What do you think?

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