pback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Chapter 16: Multilayer Switches Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 IP multicasts) 0 runts, 0 giants, 0 throttles input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored packets output, 0 bytes, 0 underruns output errors, 0 interface resets 0 output buffer failures, 0 output buffers swapped out Once we add VLAN 200 to the switch, the interface comes up: 3750-I0S(config-if)#vlan 200 3750-IOS#sho ip int brie I include Vlan200 Vlan200 10.200.0.1 YES manual up We have not assigned any ports to this VLAN, but the SVI for the VLAN is up and operating at Layer 3. We can even ping the new interface: 3750-IOS#ping 10.200.0.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.200.0.1, timeout is 2 seconds: !!!!! If we were SO inclined, we could also add routing protocols and do almost anything else we would normally do with an interface operating at Layer 3. What's the point of having an SVI without any physical ports assigned to it? One ex- ample might be to create a management network other than VLAN 1 for all your de- vices. You wouldn't need any physical ports assigned to the VLAN except for a trunk port to your other switches. This way, you could keep your management traffic on a separate VLAN from your production traffic. You may also have VLANs attached to your switch via trunks, in which case you might use the switch as a default gateway, even though there are no ports dedicated to the VLAN. Hybrid Mode (4500, 6500) On a switch supporting hybrid IOS mode, IOS is not an integral part of the switch's function. CatOS is used for switching, which is integral to the operation of Layer 2. IOS is used only to manage the MSF