Let me change your question a little...
Most hw vendors announces now intergared router-switches (CISCO NORTEL, etc); usially it is very fast but limited-features devices.
The question - is anyone using such devices in the production networ? In the ISP network?
We were close to getting some for our network, but were unable to get any hard facts about people who are using them as "backbone" or "border" routers. In the end, we've decided to go with Cisco GSR's. The flaws we tended to find were with not enough enough memory to hold full routing tables, or a limit on the number of route entries. Another flaw was mentioned with regard to the route caching - something about needing to hold in table of which IP addresses were on which port (usual switch behaviour). Simon -- Simon Lockhart | Tel: 01737 839676 Senior R&D Engineer, Online | Fax: 01737 839665 BBC Research & Development | Email: Simon.Lockhart@rd.bbc.co.uk Kingswood Warren, Tadworth, Surrey. | URL: http://www.bbc.co.uk/rd/