Yo, I just got a 2507 router with 1 ethernet, 2 Serial Interfaces and I can't get either Serial to work. I've tried the basic [ip add, no shut, clock rate, bandwidth] configerations but no matter what I do it always says "Serial1 is down, Line protocal is down" when I do a [show int]. I can't ping the interface and when I do a [show ip route] it only shows the ethernet network. Any suggestions or are the interfaces faulty?
You can ping all day and all night, but if you don't have those serial interfaces connected to something and up/up (vs. shutdown or disconnected) you won't get a response from the IP addresses you assigned to them.
You won't see the corresponding subnets in your route table, either, unless you have redundant connections and dynamic routing protocols telling your router how to find its way to those subnets through alternate paths.
What you're describing sounds like normal behavior for Cisco routers. I don't think there's anything wrong with your serial ports.
You need to get another router and a serial cross-over cable to test this. And either a single DCE-to-DTE back-to-back router cable; or two regular cables, one DCE and the other DTE, with the appropriate genders on the connectors so you can plug them both together forming a DCE-to-DTE link. Connect the two routers using this cable, and on the router with the DCE end run the clock rate command on that serial interface. Also, make sure your serial encapsulation matches on both ends (either HDLC or PPP).
When you get that serial link up, you should see your assigned IP addresses and subnet.
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