terface brief: Switch-IOS# sho ip int brief Interface IP-Address OK? Method Status Protocol Vlan1 unassigned YES NVRAM administratively down down CatOS Versus IOS Vlan20 10.10.20.2 YES manual up Vlan40 10.10.40.2 YES manual up Vlan50 10.10.50.2 YES manual up GigabitEthernet1/1 unassigned YES unset up GigabitEthernet1/2 unassigned YES unset up GigabitEthernet1/3 unassigned YES unset GigabitEthernet1/4 unassigned YES unset up Unfortunately, this command, while useful, does not show you the port names. You need the show interface description command for that: Switch-IOS# sho int desc Interface Status Protocol Description admin down Web-VLAN App-VLAN DB-VLAN Gi1/1 Web-1-E1 Gi1/2 Web-2-E1 Gi1/3 Web-3-E1 Gi1/4 Web-4-E1 Even with the use of both of these commands, you still don't know the VLANs to which the ports are assigned. For VLAN assignments, you need the show vlan command: Switch-IOS# sho vlan VLAN Name Status Ports default active WEB-VLAN active Gi1/1, Gi1/2, Gi1/3, Gi1/4 Gi1/5, Gi1/6, Gi1/7 APP-VLAN active Gi1/8, Gi1/9, Gi1/10, Gi1/11 DB-VLAN active Gi1/14, Gi1/15, Gi1/16 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup IOS tends to be a bit wordy. For example, the output of the IOS show interface interface# command, which shows the pertinent information for interfaces, looks like this: Switch-IOS# sho int g3/1 GigabitEthernet3/1 is up, line protocol is up (connected) Hardware is C6k 1000Mb 802.3, address is 0015.6356.62bc (bia 0015.6356.62bc) Description: Web-1-E1 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Full-duplex, 1000Mb/s input flow-control is off, output flow-control is on Clock mode is auto Chapter 17: Cisco 6500 Multilayer Switches ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output 00:00:47, output hang never Last clearing of "show interface" counters never Input queue: 0/2000/2/0 (size/max/drops/flushes) Total output drops: 2 Queueing strategy: fifo Output que