if I have my core router, and a 3550 switch on my lan, I have then a wan link from this 3550 to my other office, how do I route to the layer 3 port on the switch, Do I point a route to vlan 1 on the switch from my core ?
There are couple of ways you can configure the switch for WAN (routed) links.
On a layer 3 switch you can make the switchport a layer 3 (routed) port by issuing the command 'no switchport' on the physical interface and configuring all IP address & parameters on this interface. In this case, the route on your core device would point to this address as the next hop.
You can create a SVI (logical) VLAN interface and assign it the IP address. In this case, the uplink port connected to your core would be acting as a switchport (default). The route from the core would be pointing to the next hop address of the SVI (vlan) interface of this switch.
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