[cisco-voip] oddball hsrp/phone issue

[Justin Steinberg]

Dhcp scope have 130 for default gateway?

On Friday, July 13, 2012, Ed Leatherman wrote:

> Anyone ever run into something like this?
>
> We have a cat4500 doing some routing and was in HSRP group with another
> switch temporarily. temporary situation is over, and other switch is
> removed, and we went to remove the HSRP config today from all the SVIs.. so
> for example
>
> interface Vlan2
>  ip address 10.x.x.130 255.255.255.192
>  ip access-group ip-phones-in in
>  ip access-group ip-phones-out out
>  no ip redirects
>  standby 2 ip 10.x.x.129
>  standby 2 timers 1 2
>  standby 2 priority 90
>  standby 2 preempt
>
> was to become
>
> interface Vlan2
>  ip address 10.x.x.129 255.255.255.192
>  ip access-group ip-phones-in in
>  ip access-group ip-phones-out out
>  no ip redirects
>
> When we did this for the printer vlan, PC vlans, etc, no problems. When we
> did this for the voice vlan, phones quit communicating and we couldn't ping
> them from the router. My thought was they were still using the virtual mac
> from hsrp and were not updating their arp tables. As soon as we put the
> HSRP config back on, they started working again. Left it with HSRP enabled
> for now but may try again and reboot phones as part of the procedure next
> time I get the OK for some more maintenance work.
>
> Gratuitous ARP is disabled for these phones, would that possibly cause
> this issue? I tried to duplicate the situation in my lab with some phones
> on CME, but disabling hsrp worked fine on those regardless of if garp
> disabled or not.
>
> Phones 7962's, firmware 9-3-1 with a few static set to 9-2-3 for now. CM
> 7.1
>
> --
> Ed Leatherman
>
>
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