Switching for Cisco IPT

Here is a question a customer emailed me today
" so im looking at the Cisco IPT solution and its impressive. after noticing the costing, i see no way of justifying the switching infrastructure. our entire organization is based on dell switching and Cisco routers.
we intend to stay with this as our switches are new has QOS and POE enabled as well as IEE power compliant as i understand and will work with the Cisco Phone models. we can also acheive the same measure of redundancy as proposed in the 3-layer model that Cisco applies. please advise as to if there are any limitations of these switches as i cannot see any at this point in time"
from a pre-sales prospective how do you justify changing to Cisco, and more importantly, from a TECHNICAL prospective do we convince the customer to change or leave?

In terms of implementation and operation: if you follow the separate VLANs for voice and data model - which you probably should - you will have to manually set the correct VLAN on every phone in the phone settings. phones use CDP to discover voice VLAN. I've done a deployment with non-Cisco switches such as this, and it definately slows things down. Of course you don't want to hurt any feelings, but... there is a reason Dell was giving away their switches for free a few years back. I like to save money too, but I wouldn't stake my business on running critical infrastructure this level of switch.

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