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ports drop on cisco 2950

Posted on 2003-03-07
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Last Modified: 2008-03-03
Maybe you can make some sense of this.  1st floor computers appear as though their network connections drop. Not all at the same time though.  There are still link lights though.  We assumed network was gone because they couldn't work with the servers anymore and couldn't ping their gateway on the corerouter.   I had run a netdiag /debug and we saw it find everything up to the gateway then it stalled.  We then tried pinging the router and the gateway, no response but we then pinged servers up here an got responses.  Just to check, we tried the gateway again and got no response.  Reset the network connection and it all comes back.

A trace at the time showed no response from the first hop then a response from the server.


the switch os info:
Cisco Internetwork Operating System Software
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(11)EA1, RELEASE SOFTWARE
(fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Wed 28-Aug-02 10:25 by antonino
Image text-base: 0x80010000, data-base: 0x80528000

We do have port fast on and tried to configure the ports for both auto and static speeds with the workstation configs to be matched.

Thanks

Scott
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Question by:gurnie
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15 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 8090102
G'day, gurnie

How about a little more information, like how this switch is connected in relation to the gateway that you are trying to get to? Are you using any L3 capabilities of this switch? Is it uplinked to something else? Have you looked at the uplink port error stats? Do you have uplink fast turned on? Any VLAN's?


Cheers!
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Author Comment

by:gurnie
ID: 8090168
There are two vlans 1 and 10, vlan 1 has been shut down.  The switch is connected via fiber to a cisco 4500 gigabit connection.  port channel 1 is not running fast start.  We were getting CRC errors on the workstation ports, but they stopped when we hard coded the speed on the ports and workstation interface cards.
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LVL 79

Expert Comment

by:lrmoore
ID: 8090276
Any system messages from console about neighbor not on native vlan?

Any errors on the uplink port?
Does the 4500 have the L3 module and acts as the core router?
If the local systems can still talk to each other when they can't talk to the gateway, then it is most likely the uplink port, or something on the 4500 and that port.


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Author Comment

by:gurnie
ID: 8090358
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.
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Author Comment

by:gurnie
ID: 8090509
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.
0
 

Author Comment

by:gurnie
ID: 8090592
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.
0
 
LVL 79

Expert Comment

by:lrmoore
ID: 8090607
gurnie,
Don't use the refresh button. Use the "reload this question" link under your username.

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Author Comment

by:gurnie
ID: 8090624
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.
0
 

Author Comment

by:gurnie
ID: 8090670
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.
0
 

Author Comment

by:gurnie
ID: 8090693
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.
0
 
LVL 5

Expert Comment

by:rrhunt28
ID: 8090885
Maybe he is just really excited?
0
 
LVL 11

Expert Comment

by:geoffryn
ID: 8091079
You might check to see if the CPU on the switch is experiencing high utilization.

I have seen behavior like this when there is a machine infect with SQL slammer on the net.  The slammer spams the net with multicast.  The switch deals with the multicast traffic in software not ASIC(because it might be destined for the management interface) and the packet forwarding process spikes.

A quick peek with a sniffer will find if a slammer system is on your network.

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LVL 2

Expert Comment

by:jgarr
ID: 8095353
I need to have have someone put something on the console to see if there are console messages.

That is correct that the 4500 does have the L3 module acting as the core router.

We know that it could not ping the fiber on the switch, but did not try to ping workstations on the local subnet.

hee hee hee. Sorry, I couldn't resist.
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LVL 79

Expert Comment

by:lrmoore
ID: 8637158
gurnie,
No comment has been added lately (87 days), so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area for this question:

RECOMMENDATION: PAQ/No Refund

Please leave any comments here within 7 days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Thanks,

lrmoore
EE Cleanup Volunteer
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