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

[David Bigge]

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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