How to configure cisco switches to connect alcatel phones and pcs?
one of our customers plans to connect alcatel ip phones "ip touch 4038" (with pcs connected to the phones) to cisco Cat4500 switches. Also normal pcs should be connected directly to the 4500.
So I think the phones would be connected with vlan trunk and the pcs with normal access port configuration.
To insure an easy switch administration we are looking for one (!) common switchport configuration which allows the connection of phones and also pcs. As far as I know with cisco phones we could use dtp so that the switchports dynamically uses trunk or access configuration depending on the connected device (phone or pc).
Does anybody know how we can fulfill this requirement with alcatel phones?
If there exist best practise documentation concerning ip phones (trunks, voice vlan etc.) it would also be fine if somebody could tell me the url.
Re: How to configure cisco switches to connect alcatel phones an
thank you for your explanation.
I tested the switchport configuration and it worked fine, both for a phone (with pc behind it) and for a pc. It worked also without the "switchport access vlan" command, I assume because for the switch it's always a trunk regardless what's connected.
So my test configuration looks like the following:
switchport trunk native vlan 10
switchport trunk allowed vlan 10,100
swithport mode trunk
I also took some traces on the pc with wireshark in both setups and I found out some issues.
Setup 1: PC is connected at the phone
-> On the pc I get tagged broadcast traffic from the voice vlan. Perhaps my phone configuration is wrong; I checked the configuration but the only vlan parameters I can configure are
- activating vlans
- choose one vlan number
- activating the strict vlan option
So is it correct that the phone forwards voice vlan broadcasts to the pc port?
Setup 2: PC is connected directly at the switchport
-> Because the switchport is configured for tagging the voice vlan, all broadcast traffic (e.g. arp, stp) of the voice vlan is sent out of this port. So there is some unnecessary overhead now on this switchport. Did you already consider this issue?
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