We have issues with a 3750 WS-C3750-24PS-and connectivity to a Siemens Optipoint 420 IP phone. Switch is not seeing/recognising ARP packets from the IP phone. We connected the IP phone and a PC to a hub and then to switchport, both PC and IP phone can ping each other and PC can ping through the switch though IP phone cant. We have an ethereal capture from PC on the hub and can see ARP requests from the IP phone but we do not see these when running debug arp on the switch.
The IP phone works fine when connected to a 2950 or 3Com switch (all switchports involved are in the same Vlan).
Any suggestions to why the 3750 is not recognising the IP phone ARP packets.
We now have it working root cause was QOS settings on the Siemens Optipoint 420 IP Phone.
In summary the IP Phone has QOS settings for Layer2 and Layer3 (which were defaulted to both enabled). However any time L2 is enabled it wouldn't work (there is some reference to L2 in that when it is disabled it forces Vlan discovery mode to Manual with default ID of 0). Looks like when L2 QOS is enabled it is trying to discover the Vlan dynamically and having problems.
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