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1.7  Packet Capture典型配置举例

1.7.1  配置报文捕获举例

1. 组网需求

在Switch A的Gigabitethernet1/0/1接口上开启报文捕获功能。配置捕获接口Gigabitethernet1/0/1入方向上的硬件转发与软件转发报文。

2. 组网图

图1-1 Packet Capture捕获报文组网图

3. 配置步骤

# 创建IPv4高级ACL 3000，并定制如下规则：只捕获源IP为192.168.56.1的报文。

<SwitchA> system-view

[SwitchA] acl advanced 3000

[SwitchA-acl-ipv4-adv-3000] rule permit ip source 192.168.56.1 0

[SwitchA-acl-ipv4-adv-3000] quit

# 定义流行为behavior1，配置流量镜向到CPU。

[SwitchA] traffic behavior behavior1

[SwitchA-behavior-behavior1] mirror-to cpu

[SwitchA-behavior-behavior1] quit

# 定义类classifier1，匹配ACL3000。

[SwitchA] traffic classifier classifier1

[SwitchA-classifier-classifier1] if-match acl 3000

[SwitchA-classifier-classifier1] quit

# 定义一个名为user1的策略，并在策略user1中为类classifier1指定采用流行为behavior1。

[SwitchA] qos policy user1

[SwitchA-qospolicy-user1] classifier classifier1 behavior behavior1

[SwitchA-qospolicy-user1] quit

#将策略user1应用到接口GigabitEthernet1/0/1的入方向上。

[SwitchA] interface gigabitethernet 1/0/1

[SwitchA-GigabitEthernet1/0/1] qos apply policy user1 inbound

[SwitchA-GigabitEthernet1/0/1] quit

[SwitchA] quit

# 开启Gigabitethernet1/0/1接口上的报文捕获功能，捕获软硬件转发报文。

<SwitchA> packet-capture interface gigabitethernet 1/0/1

Capturing on 'Gigabitethernet1/0/1'

  1   0.000000 192.168.56.1 -> 192.168.56.2 TCP 62 6325 > telnet [SYN] Seq=0 Win

=65535 Len=0 MSS=1460 SACK_PERM=1

  2   0.000061 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=1 Ack

=1 Win=65535 Len=0

  3   0.024370 192.168.56.1 -> 192.168.56.2 TELNET 60 Telnet Data ...

  4   0.024449 192.168.56.1 -> 192.168.56.2 TELNET 78 Telnet Data ...

  5   0.025766 192.168.56.1 -> 192.168.56.2 TELNET 65 Telnet Data ...

  6   0.035096 192.168.56.1 -> 192.168.56.2 TELNET 60 Telnet Data ...

  7   0.047317 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=434 Win=65102 Len=0

  8   0.050994 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=436 Win=65100 Len=0

  9   0.052401 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=438 Win=65098 Len=0

 10   0.057736 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=440 Win=65096 Len=0

10 packets captured

1.7.2  配置报文捕获并解析文件举例

1. 组网需求

·     在SwitchA的Gigabitethernet 1/0/1接口上开启报文捕获功能，配置捕获报文的个数为10个，配置将捕获的报文存入文件a.pcap。

·     配置捕获报文完成后，开启解析a.pcap报文文件。

2. 组网图

图1-2 Packet Capture捕获报文并解析报文文件组网图

3. 配置步骤

# 开启Gigabitethernet1/0/1接口上的报文捕获功能，指定捕获报文个数上限为10，指定捕获的报文存入文件a.pcap。

<SwitchA> packet-capture interface gigabitethernet 1/0/1 limit-captured-frames 10 write flash:/a.pcap

Capturing on 'Gigabitethernet1/0/1'

# 开启报文解析功能，指定解析的完整文件名为flash:/a.pcap。

<SwitchA> packet-capture read flash:/a.pcap

  1   0.000000 192.168.56.1 -> 192.168.56.2 TCP 62 6325 > telnet [SYN] Seq=0 Win

=65535 Len=0 MSS=1460 SACK_PERM=1

  2   0.000061 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=1 Ack

=1 Win=65535 Len=0

  3   0.024370 192.168.56.1 -> 192.168.56.2 TELNET 60 Telnet Data ...

  4   0.024449 192.168.56.1 -> 192.168.56.2 TELNET 78 Telnet Data ...

  5   0.025766 192.168.56.1 -> 192.168.56.2 TELNET 65 Telnet Data ...

  6   0.035096 192.168.56.1 -> 192.168.56.2 TELNET 60 Telnet Data ...

  7   0.047317 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=434 Win=65102 Len=0

  8   0.050994 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=436 Win=65100 Len=0

  9   0.052401 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=438 Win=65098 Len=0

 10   0.057736 192.168.56.1 -> 192.168.56.2 TCP 60 6325 > telnet [ACK] Seq=42 Ac

k=440 Win=65096 Len=0