That command is there if you happen to install one of the 4,8 or 16 port switchcards into the chassis, then you create the SVI's for that switchcard as you would for any layer 3 switch . Its of little use if you don't have a switchcard installed.
Perhaps I am not clear about what you are attempting to accomplish. If your interpretation of SVI is specificcally to create a "VLAN" interface then Glen is correct that the only way to create a VLAN interface on the 2821 router is to have a switch module installed. But another possible interpretation of SVI is the ability to communicate with VLANs running on a switch. In that case you can configure the Ethernet interface(s) for trunking by configuring subinterfaces and assigning VLANs to the subinterfaces. It might look something like:
encapsulation dot1q 15
ip address x.x.x.x
encapsulation dot1q 22
ip address y.y.y.y
If I have not correctly understood what you are trying to accomplish then perhaps you can clarify for me.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
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