Re: Interconnecting Cat4506 with Nortel passport switches
They're still just switches.
The copper connection should be a crossover cable.
If the Nortels are using VLANs, they should be 802.1q; I'm pretty sure that Nortel never used a proprietary trunking protocol (and if they did, they usually update to the standard ASAP).
So, theoretically, you should be able to define your inter-switch connection ports for 802.1q, connect your crossover cable, and be good to go (you'll need to configure VLANs on the Cisco to match).
Also VTP is "Cisco only" so make sure the 4000 is in "Transparent" mode to prevent pumping VTP admin packets into a device that won't understand them.
Absolute worse case:
In the event that you can't get the 802.1q working ...
Define your VLAN port groups on the 4000, then connect a crossover cable from each VLAN port group on the Nortel to the comparable port group on the Cisco (If there are eight VLANs on the Nortel that you want to carry to the Cisco, then there'd be eight cables connecting the two).
This would be a good time to re-design your VLANs too, if you want to / need to, since the access-ports don't have tags .. you could connect a port from VLAN 111 on the Nortel into VLAN 456 on the Cisco.
One thing to watch for is that Nortel supports their version of "Etherchannel" such that the multiple links can be on te same blade (same switch), different blades (same switch) or different switches.
If that's the case, you may need to break the group in order to migrate.
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