Commands using tcpdump sorted by votesThis gives you lots of nifty Cisco network information like VLAN tag, port and switch information. Show Sample Output 14:42:57.087609 CDPv2, ttl: 180s, checksum: 692 (unverified), length 358 Device-ID (0x01), length: 11 bytes: 'Public_DMZ' Address (0x02), length: 13 bytes: IPv4 (1) XXX.XXX.XX.X Port-ID (0x03), length: 16 bytes: 'FastEthernet0/21' Capability (0x04), length: 4 bytes: (0x00000028): L
Beyond the Linux Man Page: tcpdump
