Re: AVAYA IP telephones Over Cisco Switches

DHCP option 246 points to file server. Phone boots first with a data lease
and pulls boot file via the server set in option. Trick is done by end
point. Phone learns voice/data vlans from boot file. options are pretty std
with IP PBX (including Cisco phones)

HTH

Marc
On Monday, January 9, 2012, Radioactive Frog <pbhatkoti_at_gmail.com> wrote:
> Marc,
> I was wondreing - How this vlan switchover is working?
> AFAIK, DHCP server can't do this kind of tricks! i.e. downloading on vlan
x and then after reboot on vlan Y.
>
>
> On Sun, Jan 8, 2012 at 5:12 AM, marc edwards <renorider_at_gmail.com> wrote:
>>
>> I work in a Cisco network Avaya call center environment. We use
>>
>> no cdp enable
>> switchport trunk encapsulation dot1q
>> switchport mode trunk
>> switchport trunk allowed vlans Data , Voice
>>
>> some times I see the native VLAN set to the data VLAN but above is
enough.
>> We have to throw in DHCP options for phones for first boot up; they pull
>> boot file with information about data, voice VLANS. Phone resets as a
>> switch trunking both voice for hand set and possibly Data for a PC jacked
>> into it.
>>
>>
>> On Sat, Jan 7, 2012 at 2:39 AM, Karim Jamali <karim.jamali_at_gmail.com>
wrote:
>>
>> > Dear Mahmood,
>> >
>> > You should use LLDP-MED as this is the standard. There is an IOS
version
>> > that supports it..Once this is done, the switch should be able to
inform
>> > the phone on the voice vlan to use..
>> >
>> > There is one workaround which is to boot the phone and by default it
will
>> > take from the data(untagged scope) and through DHCP server you can
enforce
>> > a VLAN causing the phone to request an address from the voice scope
>> > (tagged) however the phone will be booting twice.
>> >
>> > HTH
>> >
>> > Thanks
>> > On Jan 7, 2012 1:04 PM, "Mahmoud Nossair" <mahmoud.nossair_at_gmail.com>
>> > wrote:
>> >
>> >
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>> >
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>>
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Received on Mon Jan 09 2012 - 07:04:34 ART