Connecting Cisco router to another Cisco router

[tonynsx]

I know when connecting similar devices you're suppose to use crossover cables.

My question is, what happens if I use a "normal" cat 5 where both ends are the same?

I'm connecting 2 Cisco 2611 to each other.

[Georg Pauwen · Accepted solution]

Hello,

unless your IOS supports auto MDIX (which means it detects the connecting cables and logically switches pinouts), a straight cable won't work.

For reference, bookmark the handy guide below:

https://www.computernetworkingnotes.com/ccna-study-guide/cabling-cisco-devices-guide.html

[tonynsx]

How can I check if they support auto MDIX?  Is there a Cisco command?

Thanks,

Tony

[tonynsx]

I found this, I assume it's the same for a router (if it's available on my Cisco 2611)

Switch# configure terminal
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# speed auto
Switch(config-if)# duplex auto
Switch(config-if)# mdix auto
Switch(config-if)# end

[Georg Pauwen]

Indeed, check for the interface command 'mdix auto'...

[tonynsx]

Thanks

[Leo Laohoo]

2600 routers don't support MDI/MDI-X.

[tonynsx]

I guess that's why I can't ping the other router?  Plus, no link lights are on even though I have no shut. 

I will connect crossover cables. 

[Leo Laohoo]

That's why CCNA courses will always teach the basics of when to use a cross-over and straight-through cable.
So what type of cable is used to connect the routers?