[cisco-voip] OT: ping issues on Cisco switches but not hub

[Lelio Fulgenzi]

thanks David. some good ideas there. 

the real issue is with a working switch, the wr erase was to start from scratch, but that might not have worked properly after reading some of your comments. the interfaces were definitely up and all on VLAN 1. 

definitely some things to look at.... 


--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 


----- Original Message -----
From: "David Bigge" <davidbigge at hotmail.com> 
To: lelio at uoguelph.ca, lkoziol at rcsvc.com 
Cc: cisco-voip at puck.nether.net 
Sent: Tuesday, August 16, 2011 3:23:29 PM 
Subject: RE: [cisco-voip] OT: ping issues on Cisco switches but not hub 


After wri erase you should only have vlan 1...but if VTP was configured you could still have the vlan.dat file which might provide some odd vlan's. 

Check active vlans- 

"sho vlan br" 

Are the two ports of the PC's in the same vlan? If yes is the vlan admin'ed down...are both PC ports no shut? 

sho int status 

sho run int vlan1 

config t 
int vlan1 
no shut 

If that is up...does the switch have mac/arp entries for the PC's? 

sho ip arp 
sho mac address-table 



Date: Tue, 16 Aug 2011 14:33:46 -0400 
From: lelio at uoguelph.ca 
To: lkoziol at rcsvc.com 
CC: cisco-voip at puck.nether.net 
Subject: Re: [cisco-voip] OT: ping issues on Cisco switches but not hub 


can't recall what it said, it was in a test environment. both servers were on a switch with a wr erase performed. the only thing i can think of is i didn't have a portfast configured now that i think of. so that might be the next thing i do during troubleshooting. 



--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 



From: "Lukasz Koziol" <lkoziol at rcsvc.com> 
To: "Lelio Fulgenzi" <lelio at uoguelph.ca>, "cisco-voip (cisco-voip at puck.nether.net)" <cisco-voip at puck.nether.net> 
Sent: Tuesday, August 16, 2011 2:31:39 PM 
Subject: RE: [cisco-voip] OT: ping issues on Cisco switches but not hub 




What’s the traceroute show from each PC? 



And what does the traceroute show from the switch to each PC? 








Lukasz Koziol 

Voice/Network Engineer 





From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi 
Sent: Tuesday, August 16, 2011 12:07 PM 
To: cisco-voip (cisco-voip at puck.nether.net) 
Subject: [cisco-voip] OT: ping issues on Cisco switches but not hub 




I have a couple of SuperMicro PCs running CentOS which can not ping each other when on a Cisco switch, but they can ping each other on a hub. I have to grab a cheap consumer switch to test on as well but thought I'd shoot this out to the group to see if anyone has seen anything like this before. 



--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 


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