[cisco-voip] oddball hsrp/phone issue

[george.hendrix at l-3com.com]

I’ve seen a similar issue before.  I could take the same subnet, reconfigure it on a different VLAN number, and it worked.  Put it back to the original VLAN number and it wouldn’t work.  That was a long time ago and I don’t remember exactly what the fix was.  It was like chasing a ghost…LOL.


From: Ed Leatherman [mailto:ealeatherman at gmail.com]
Sent: Tuesday, July 17, 2012 9:43 AM
To: Hendrix, George (Bill) @ LSG - STRATIS
Cc: cisco voip
Subject: Re: [cisco-voip] oddball hsrp/phone issue

We did try to ping from the 4500 (default gw) while it was happening, without any success. I wasn't in the 'driver's seat' but pretty sure the network ops guy just used ping without any other options - i'm a wee bit unclear on which source interface IOS picks at that point but i'm assuming it would choose the SVI for the vlan since its directly connected. I didn't think to ask him to use extended commands and specify the source interface to be sure though.

If I can't duplicate this in the lab this afternoon with a 4500 I will probably end up making a new voice vlan and subnet w/o hsrp so I can move them over a few at a time instead of all at once. Relatively straight forward, but i'll have to reconfigure SRST, and it won't explain why we even had the issue in the first place.

Thanks the suggestions everyone!

On Sat, Jul 14, 2012 at 6:14 PM, <george.hendrix at l-3com.com<mailto:george.hendrix at l-3com.com>> wrote:
Have u tried to ping the phones sourcing from the Def GW IP address?  Did it work?  Clear mac table and arp table on all routers/switches with that VLAN?

Can you connect a PC to that VLAN (access mode of course) and it work?


Disabling gratuitous ARP should not be the issue.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/security/5_1_3/secu_ph.html#wp1028752

Regards,
Bill

From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto:cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net>] On Behalf Of Ed Leatherman
Sent: Saturday, July 14, 2012 7:27 AM
To: Justin Steinberg
Cc: cisco voip
Subject: Re: [cisco-voip] oddball hsrp/phone issue

I wish, that would be an easy fix!

ip dhcp pool ipphones
 network 10.x.y.128 255.255.255.192
 option 150 ip <tftp servers>
 default-router 10.x.y.129



On Fri, Jul 13, 2012 at 7:30 PM, Justin Steinberg <jsteinberg at gmail.com<mailto:jsteinberg at gmail.com>> wrote:
Dhcp scope have 130 for default gateway?




--
Ed Leatherman



--
Ed Leatherman
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