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| Networking : Tricky Ones : Why Isn't My 2503 Working? |
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| Question: | Help! Not sure what in the heck I'm doing wrong, but maybe you can point me in the right direction. I received a Cisco 2503 that a division of the company I work for was no longer using. I decided to take this baby home and use it to help with my studies for my CCNP. I erased the startup config and performed a reload. Here's the current configuration:
Router_2503#show run Current configuration: ! < ! ! hostname Router_2503 ! interface Ethernet0 ip address 192.168.0.199 255.255.255.0 ! router igrp 1 redistribute connected network 192.168.0.0 ! < ! end I have another router on my network, a 2511, which works fine, I can connect via the AUI interface. I've tried the AUI interface off of this router, thinking maybe the one on the 2503 might be bad; but both AUIs work on the 2511. This leads me to believe I've screwed up the config somehow. Any pointers or direction would be most appreciated. |
| Answer: | I'm not entirely sure I understand the difficulty here. If you connect the two AUI ports together, then everything works fine between the 2511 and 2503?
The AUI port is the ONLY Ethernet port that you have available on the 2503. Looking at your ports from left to right, you have the 15-pin Ethernet AUI port, two 60-pin serial ports, then three RJ-45 ports signifying ISDN BRI, Console and AUX terminal ports. When you mention that the 2511 works just fine while the 2503 does not, are you using the same Ethernet cable and AUI transceiver (in other words, only changing out the router leaving everything else the same)? In this testing scenario, the only thing changing is the router, and that should give you some idea to what is working and what isn't. In addition, I'd look at the router itself. Your configuration doesn't suggest anything that could be wrong here, but I'm not sure I have enough information either. Starting at the physical layer, troubleshoot. This involves the swapping out as described above. Rule out the physical layer as the point of failure. Following the OSI model from Layers 1 through 7, if one of them doesn't work, none of the others following will. That means if it's not plugged in, I don't care how good your configuration is, nothing will work. So ruling out the physical layer, we should at least have a green link light on the AUI and our hub/switch/whatever. Actually, let me back up a step. What are you connecting to? If you're connecting the router directly to another router, you need to have a crossover cable used here. If you're connecting to a hub/switch, then a straight-through cable will suffice. So assuming our cabling is fine, and we have a link light, most of the time, we should be moving traffic through. However, look at your interface statistics. Use the "show interface ethernet0" command to see this. If we're lucky, the port will be in an up/up state, meaning traffic is passing. If the interface is reported in an up/down state, there are a few things that can be wrong here. Most of the time this occurs when connected to a switch and the speed or duplex are mismatched! Remember that the 2500 series routers are all only 10 megabit Ethernet and all run only half duplex. If your settings are mismatched with whatever you're connecting to, you may have some technical difficulties getting frames moving. That covers the basics. Otherwise, you have your Ethernet interface in a "no shutdown" state, and assuming your IP subnet is the same as your attached device, things look good there. It's generally difficult to troubleshoot interfaces/ports from looking at the configuration though! For more information on hardware and port configurations for the 2500 series routers, check out: www.cisco.com/en/US/products/hw/routers/ps233/ www.cisco.com/en/US/products/hw/iad/ps492/ If you need information on cable pinouts, most hardware guides have them; here's one link: www.cisco.com/en/US/products/hw/cable/ps2221/ |
| last updated 01.03.2003 | |
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