I have been looking through your configuration and trying to spot something that may be causing this, but nothing is really jumping out at me. On the phones, do they have any workstations that connect to them for internet access? Or is it just the phone by itself? One thing we can look at doing is enabling jumbo frames. Jumbo frame can be enable thru out all ports and The switch will still pass regular frame sizes. Jumbo frames need to be enable thru out all connections on both ends, once enable on the LAG on one switch you will need to enable it on the other switch LAG also to pass back. console(config)# interface range ethernet 1/g1-1/g48 console(config-if)#mtu 9216 console(config-if)#exit console(config)# interface ethernet port-channel 1 console(config-if)#MTU 9216 console(config-if)#exit Make sure you save the configuration to the startup-config on the switch. Try that out and see if there is any change in behavior. Thanks.
Hello, We are seeing packet loss on our voice network which causes the phone to sometimes ring continuously.  This could be the result of oversized packets (more details below).  Also on a separate note, if I transfer images using Windows Deployment Service multicast it floods all ports (so I don't do that anymore :-).  I had originally enabled IGMP but it previously caused the switch to crash randomly which could have been related to earlier firmware. We have pretty simple network: I digged in further and we are seeing quite a few "oversized packets" on the LAG trunks.  I was wondering if this is causing the packets to drop.  If so, should I modify the MTU size to 1522 (I was reading that tagging adds 4 bytes to the default MTU of 1518) or is there a configuration error I'm overlooking somewhere?  Here's the config for our dist switch:
Oversized packets possibly causing packet loss with Dell PC6248