Cisco Switching/Routing :: WS-C2960S-24PS-L Floods Network

Jan 21, 2013

I have three new 2960 switches as listed in the title. I configured them as follows:

192.168.1.215     host: whse-c
192.168.1.216     host: whse-b
192.168.1.217     host: whse-a
 
Switches B and C flow into A before continuing on into the server room switch (distance issues).All three switches are configured for ports 21-24 at 1000 and set as cisco switches. all other ports are undefined as they have a myriad of desktops, printers and non cisco access points flowing into them. side question - should i configure them as access points where applicable even if they are non cisco? I am replacing three netgear switches that currently are in place and have no known issues other than they are old and the fans may fail soon.hooked up .217. was able to get to it from the network. Hooked up 215 and then 216.  All the sudden I lost the ability to tap into the switches, any of them. (I think I had done 215 at that point too, before adding 216.  I found out later it took the network to its knees as internet was lost, and the MPLS stopped functioning.
 
I undid the changes and put the netgears back in service and all was right with the world again.  At first I thought it was a bad host name as I had used whse-a on switch C in error. I changed that after this issue.Later that day I put 215 in place. checked it from the network and could get to it just fine. Then I put 216 in service. I lost connection to 215. I could no longer get to the internet from my pc and the MPLS went down again.  This time I just unhooked 216. 215 is still in place and working on the network at the moment and not causing issues. (btw these switches are not even in my path from my pc to the internet, just on the same network) tomorrow I am going to try 217 again while 215 is still on the network and see if there are any issues adding that swtich. if I can do so, and there are no problems, is this an indication of a faulty switch?  what further testing can I do, have I missed something in setup?  If this brings the network down again, why cant i add two of these switches to each other/on the same network path (B and C were not even connected to each other yesterday evening when it went down again).

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CE1<-------> Provider_switch(3750)<-------> PE1 < ----IP/MPLS----> PE2<-------> Provider_switch(3750)<----------->CE2
16                        11                                                                                                 11   

[Code].....

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ACL
===========
Extended IP access list VOIP
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[Code]....

I have put a hub in to capture traffic via Wireshark to see if DSCP flags are being appropriately marked and I do see that all VoiP packets are getting marked with as EF.  However, I have been receiving phone calls from people in the remote buildings stating that their phones will cut out, flash Insufficient Bandwidth on the LCD displays and then the call will cut back in.  I am wondering if the 2801 is not applying QoS with the rate-limits in mind since it is set to 100 Mb, or is it an issue with trying to take 3 remote locations and bring them down into 1 port on the 2801?

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License Priority: None

[code].....
 
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2144211275.734470000192.168.0.3 192.168.0.255NBNS92Name query NB (my id)<20>
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2144251275.741325000192.168.0.3 (my id)NBSS126Session request, to (my network id)<20> from (her network id)<00>
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[code]....

Now combine this with the sometimes 9-10 active ports our router assigns to her IP (which don't appear to relate to anything according to numerous port id sites), does this send out a red flag to any of you? I realize it would be so much easier if I could get access to her computer, but as I said, she is very private and timid and doesn't seem to like even having people in her room, let alone letting them use her computer.

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--Abbreviated CONF
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[code]....

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-Trace back= 0x1EADA28z 0x1CDC324z 0x1EA5520z 0x1CDC35Cz 0x1CDD0E0z 0x1CDF0C4z 0x1CE06CCz 0x1CE07F8z 0x1D67348z 0x1D611BCz
 
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=== Flushing messages (07:58:56 CST Thu Apr 14 2011) ===

Buffered messages: (last 4096 bytes only)
0x00000005  R6 = 0x01224F44  R7 = 0x02A23C6C
000089: *Feb 28 18:03:13.577 CST: %PLATFORM-1-CRASHED: R8 = 0x00000080  R9 = 0x00000000  R10 = 0x00000000  R11 = 0x00000071
000090: *Feb 28 18:03:13.577 CST: %PLATFORM-1-CRASHED: R12 = 0x00034855  R13 = 0x00000280  R14 = 0x01CE0778  R15 = 0x00000000
000091: *Feb 28 18:03:13.577 CST: %PLATFORM-1-CRASHED: R16 = 0x00000000  R17 = 0x00000000  R18 = 0x00000000  R19 = 0x00000000
[ code]....

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