使用tcpdump获得Cisco网络信息

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获取Cisco网络信息

tcpdump -nn -v -i eth0 -s 1500 -c 1 'ether[20:2] == 0x2000'
这为你提供了漂亮的Cisco网络信息,比如,VLAN标签,端口和交换机信息,
示例输出
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): L2 Switch,
IGMP snooping
 Version String (0x05), length: 220 bytes:
 Cisco Internetwork Operating System Software
 IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(12c)EA1,
RELEASE SOFTWARE (fc1)
 Copyright (c) 1986-2002 by cisco Systems, Inc.
 Compiled Sun 24-Nov-02 23:31 by antonino
 Platform (0x06), length: 21 bytes: 'cisco WS-C2950G-24-EI'
 Protocol-Hello option (0x08), length: 32 bytes:
 VTP Management Domain (0x09), length: 0 byte: ''
1 packets captured
2 packets received by filter
0 packets dropped by kernel
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