I have noticed that I can either use a straight or a cross-over cable to connect a PC or a router to a FastEthernet interface on a Cisco 1841 router. Can someone confirm these LAN interfaces do support auto-sense MDI/MDX since I am not able to find anything in the data sheets.
I found this doc as well but I think it's only about these HWICs, correct me if I am wrong. However, I was referring to the fixed, built-in, LAN interfaces (FastEthernet's).
I have tested both a Cisco 1801 (FastEthernet0) and a Cisco 1841 (FastEthernet0/0 and 0/1) connected with a single UTP cable to an old Cisco 2501 and it looks like it doesn't matter what type of cable you use ... the cross-cable works as we all would expect, but the straight one works as well. I was just wondering whether this functionality can be found in any Cisco documentation; so far I was only able to find auto-MDIX info on HWICs and switch-ports.
Table 1-1 Summary of Cisco 1800 Series Fixed-Configuration Built-In Interfaces
Eliminates the need for a crossover cable and allows the router to detect medium-dependent interface in normal mode (MDI) or medium-dependent interface in crossover mode (MDIX) in any other PC or hub with a straight-through cable or a crossover cable.
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