ssh配置
en
conf t
no management ip address dhcp
management ip address 100.2.44.111/24
management route add gateway 100.2.44.1
username admin password 2021@inspur
enable password 2021@inspur
username admin privilege 4 password 2021@inspur
line vty 0 7
login local
transport input all
exit
exit
write
交换机抓包
CPU镜像模式
Switch# configure terminal 进入配置模式
Switch(config)# monitor session 1 destination cpu 配置cpu 为session 1镜像目的口
Switch(config)# monitor session 1 source interface eth-0-1 both 配置eth-0-1为session 1 的镜像源,方向为both(缺省值也为both)
Switch(config)# monitor cpu set packet buffer 100 配置mirror cpu的内存存储空间大小为100个包,最多100个包。
Switch(config)# cpu-traffic-limit reason mirror-to-cpu rate 128 配置mirror 到cpu的包的速率为128pps
Switch# exit 退出全局配置模式
2. 配置mirror cpu的抓包策略为drop,其中replace为默认值。
Switch(config)# monitor cpu capture strategy drop 配置mirror cpu的抓包策略为drop。(即:当内存空间写满之后,丢弃新包)
Switch(config)# monitor cpu capture strategy replace 配置mirror cpu的抓包策略为replace。(即:当内存空间写满之后,新包替换最旧包)
1.示例中创建了会话1用以监控源端口eth-0-1的流量,并通过show 命令查看mirror to cpu的报文。可以使用显示会话命令查看配置:
Switch# show monitor session 1
DUT1# show monitor session 1
Session 1
Status : Valid
Type : Cpu Session
Source Ports :
Receive Only :
Transmit Only :
Both : eth-0-1
Source VLANs :
Receive Only :
Transmit Only :
Both :
Destination Port : cpu
2. 查看报文mirror到 cpu后内存存储的包
DUT1# show monitor cpu packet all
packet: 1
Source port: eth-0-1
MACDA:264e.ad52.d800, MACSA:0000.0000.1111
vlan tag:100
IPv4 Packet, IP Protocol is 0
IPDA:3.3.3.3, IPSA: 10.0.0.2
Data length: 47
Data:
264e ad52 d800 0000 0000 1111 8100 0064
0800 4500 001d 0001 0000 4000 6ad9 0a00
0002 0303 0303 6365 6e74 6563 796f 75
3. 查看配置mirror cpu内存buffer大小
DUT1# show monitor cpu packet buffer
The mirror-to-cpu packet buffer size of user set is: 100
4. 查看配置mirror cpu的报文上cpu的速率
DUT1# show cpu traffic-limit | include mirror-to-cpu
mirror-to-cpu 128 0
5. 查看mirror cpu报文的存储文件
DUT1# ls flash:/mirror
Directory of flash:/mirror
total 8
-rw-r
-rw-r
14.8T bytes total (7.9T bytes free)
DUT1# more flash:/mirror/ MirCpuPkt-2017-01-03-11-41-33.txt
sequence srcPort
1 eth-0-1
++++++++1483443444:648884
8c 1d cd 93 51 00 00 00 00 00 11 11 08 00 45 00
00 26 00 01 00 00 40 00 72 d0 01 01 01 01 03 03
03 03 63 65 6e 74 65 63 79 6f 75 63 65 6e 74 65
63 79 6f 75
sequence srcPort
2 eth-0-1
++++++++1483443445:546440
8c 1d cd 93 51 00 00 00 00 00 11 11 08 00 45 00
00 26 00 01 00 00 40 00 72 d0 01 01 01 01 03 03
03 03 63 65 6e 74 65 63 79 6f 75 63 65 6e 74 65
63 79 6f 75
6.在转换成pcap 文件后,可以通过wireshark打开
DUT1#ls flash:/mirror
Directory of flash:/mirror
total 12
-rw-r
-rw-r
-rw-r
14.8T bytes total (7.9T bytes free)
7.查看mirror cpu的抓包策略
DUT1# show monitor cpu capture strategy
The capture strategy of cpu mirror is: replace (add new packet and remove oldest
packet when buffer is full
8.补充命令
如果没有生成相应的文件,通过这个命令启动
Switch# monitor cpu capture packet start
copy flash:/mirror/文件名 mgmt-if tftp://10.69.65.59/文件名
pcap convert 文件A 文件B
tftp客户端用一个tftp.exe的文件在windows上启动即可