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Cisco 3550 L3 switch; communication issues

Cisco 3550 L3 switch; communication issues

Postby kd1966 » Sat Jul 16, 2011 7:44 pm

Just wanted to see if there were any Cisco "experts" out there......... :notworthy

I'm sortof-kindof working on a project to help out my workplace - they have a single /24 subnet (192.168.x.x) and have been having issues with duplicated IP addresses on the network, meaining we are running out of IP addresses in the DHCP range.

At my last place of work, we had L3 Cisco switches that routed the VLANS across and we had multiple subnets, both in the Class C 207. range and in the Class A 10. range; we used 4507's, 3750's, and 3560 switches to do this, as well as a VOIP (Cisco) solution that ran on site in a 10. range.

I bought a cheap used/refurb'd 3550 from Amazon for ~$110 USD and managed to recover the password; starting from scratch, I blew away the old config to start out fresh. I have some experience with setting up Cisco switches and with the ability to Google......... :whistle not to mention saving snippets of configs in the past, I thought I was ahead of the game.

The last 2 weeks have been horrible though...... it seems I can ping, even telnet TO the switch FROM the PC, but from the switch, I am unable to ping the PC or send my saved configs via TFTP to the PC. My PC is a Win-7 x86 laptop and I installed all the additional TCP/IP services just to make sure it wasn't something on the PC side. The switch reports all ports working (48 ea. 10/100 plus the Gigabit fiber ports but I'm not using them at the moment). Also messed around with port speed settings on the switch ports to no avail.

The little green light is lit on the switchport, but it can't seem to talk to anyone on its own network. FWIW, I am using 192.168.5.x as the /24 subnet which is set to VLAN 100, and the VLAN is assigned to the switchport interface and all status on switch shows interface, port and protocol as UP. Yes, PC is set up on same 192.168.5.x subnet (Different last number obviously but same /24 subnet)

The IOS version is 12.1. sumthin-sumthin....... :geek: and I have the newest IOS image (12.2'ish) which I want to load but won't be able to over IP unless I can get some 2-way communication going here......... :bashhead I'm sure it's something simple that I have overlooked :question
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Re: Cisco 3550 L3 switch; communication issues

Postby kd1966 » Sat Jul 16, 2011 8:53 pm

I am a complete idiot............... :bashhead I was saying I probably missed something and I certainly did - the local network connection between the PC and the switch (In Windows 7) had Network Discovery turned OFF...... DOH! I was looking at the wrong network when I thought it was ON. Switch is pinging like a champ now.... ^*^
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Re: Cisco 3550 L3 switch; communication issues

Postby yeshuas » Sat Jul 16, 2011 9:10 pm

sometimes it is toooooooooooo close to our face to see, done it a bunch myself, welcome to the human race LOL

Glad you found and straightened out your situation
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Re: Cisco 3550 L3 switch; communication issues

Postby kd1966 » Sat Jul 16, 2011 9:20 pm

Now I have TFTP problems............. doh! pinging both ways but won't sent config or image via tftp; it's timing out....... great :blink
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Re: Cisco 3550 L3 switch; communication issues

Postby yeshuas » Sat Jul 16, 2011 9:27 pm

kd1966 wrote:Now I have TFTP problems............. doh! pinging both ways but won't sent config or image via tftp; it's timing out....... great :blink


what causes that
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Re: Cisco 3550 L3 switch; communication issues

Postby kd1966 » Sat Jul 16, 2011 10:07 pm

stupid windows firewall............... :geek: tftp was the ONLY thing being blocked....... :dontgetit anyhow, I have the config and VLAN data copied but now it's definitely a Cisco issue with getting the IOS copied up. The IOS appears to be in a directory (drwx) that is named with the IOS image name minus the .bin ending. No matter what I try I am unable to copy it up to tftp.

I saw something on using the command Archive upload-sw but it is not working either............
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Re: Cisco 3550 L3 switch; communication issues

Postby kd1966 » Sun Jul 17, 2011 1:32 pm

Fortunately for me, the 3550 had enough free RAM to simply copy up the new IOS image and just pointed the boot statement to the new one. Now have just a hair over 1MB free RAM on the switch :lol:
It's working, so I'll just delete the old image to free up some RAM
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