What cable? ASA to 3750 trunk?
Hello,
I have a ASA 5520 and will need to create a trunk to a 3750 from the one of the ASA's gigabit ports, this will allow me to create sub-interfaces on the ASA and use multiple VLAN's on the switch. For the trunk do I need to use a crossover or straight-through? I know switch-toswitch is crossover due to what pins they send and receive on, but am not sure with the ASA. To be honest I think on another setup I have used a straight-through and it has worked, but would just like to know.
Thanks.
Yes.
http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/intrface.html#wp1048058
Auto-MDI/MDIX Feature
For RJ-45 interfaces on the ASA 5500 series adaptive security appliance, the default auto-negotiation setting also includes the Auto-MDI/MDIX feature. Auto-MDI/MDIX eliminates the need for crossover cabling by performing an internal crossover when a straight cable is detected during the auto-negotiation phase. Either the speed or duplex must be set to auto-negotiate to enable Auto-MDI/MDIX for the interface. If you explicitly set both the speed and duplex to a fixed value, thus disabling auto-negotiation for both settings, then Auto-MDI/MDIX is also disabled. For Gigabit Ethernet, when the speed and duplex are set to 1000 and full, then the interface always auto-negotiates; therefore Auto-MDI/MDIX is always enabled and you cannot disable it.
-KS
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