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Administration Guide

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Network monitoring

You can monitor specific unicast MAC addresses in directed mode, monitor all detected MAC addresses on a FortiSwitch unit in survey mode, or do both. The FortiSwitch unit gives the directed mode a higher priority than survey mode. The directed mode and survey mode are disabled by default.

NOTE: Network monitoring is not available on FSR-112D-POE.

This section covers the following topics:

Directed mode

In directed mode, you select which unicast MAC addresses that you want examined. The FortiSwitch unit detects various fields of the packet—such as MAC address, IP address, VLAN, and user name—and stores the data in either of two databases.

NOTE: You cannot specify broadcast or multicast MAC addresses.

The maximum number of MAC addresses that can be monitored depends on the FortiSwitch model.

Platform Series

Maximum Number of MAC Addresses Monitored

Maximum Number of Hosts

1xx, 2xx

10

250

4xx, 5xx

20

1,024

10xx, 30xx

30

4,096

To find out how many network monitors are available, use the following command:

diagnose switch network-monitor cfg-stats

 

Network Monitor Configuration Statistics:

----------------------------------

Adds         : 0

Deletes      : 0

Free Entries : 20

 

To find out which network monitors are being used currently, use the following command:

diagnose switch network-monitor dump-monitors

 

Entry ID       Monitor Type       Monitor MAC      Packet-count
=================================================================
1               directed-mode   00:01:02:03:04:05       10
2               directed-mode   10:01:02:03:04:05       0
3               survey-mode     08:5b:0e:c1:07:65       419
4               survey-mode     08:5b:0e:4f:af:38       101
5               survey-mode     08:5b:0e:ce:59:40       2347
6               survey-mode     08:5b:0e:4f:af:44       0
7               survey-mode     08:5b:0e:c1:07:65       0
8               survey-mode     08:5b:0e:4f:af:38       80
9               survey-mode     08:5b:0e:ce:59:40       117
10              survey-mode     08:5b:0e:4f:af:44       0

 

To start network monitoring, use the following commands:

config switch network-monitor settings

set status enable

end

 

To specify a single unicast MAC address (formatted like this: xx:xx:xx:xx:xx:xx) to be monitored, use the following commands:

config switch network-monitor directed

edit <unused network monitor>

set monitor-mac <MAC address>

next

end

 

For example:

config switch network-monitor directed

edit 1

set monitor-mac 00:25:00:61:64:6d

next

end

Survey mode

In survey mode, the FortiSwitch unit detects MAC addresses to monitor for a specified number of seconds. You can specify network monitoring for 120 to 3,600 seconds. The default time is 120 seconds. The FortiSwitch unit detects various fields of the packet—such as MAC address, IP address, VLAN, and user name—and stores the data in either of two databases.

To start network monitoring in survey mode, use the following commands:

config switch network-monitor settings

set status enable

set survey-mode enable

set survey-mode-interval <120-3600 seconds>

end

 

For example:

config switch network-monitor settings

set status enable

set survey-mode enable

set survey-mode-interval 480

end

Network monitoring statistics

After you have enabled network monitoring, you can view the statistics for the number and types of packets.

To see the type of packets going to and from monitored MAC addresses, use the following command:

diagnose switch network-monitor parser-stats

 

Network Monitor Parser Statistics:

----------------------------------

Arp         : 0

Ip          : 1

Udp         : 46

Tcp         : 353

Dhcp        : 0

Eapol       : 0

Unsupported : 352

 

To see the number of packets going to and from monitored MAC addresses, use the following command:

diagnose switch network-monitor dump-monitors

 

Entry ID       Monitor Type       Monitor MAC      Packet-count
=================================================================
1               directed-mode   00:01:02:03:04:05       10
2               directed-mode   10:01:02:03:04:05       0
3               survey-mode     08:5b:0e:c1:07:65       419
4               survey-mode     08:5b:0e:4f:af:38       101
5               survey-mode     08:5b:0e:ce:59:40       2347
6               survey-mode     08:5b:0e:4f:af:44       0
7               survey-mode     08:5b:0e:c1:07:65       0
8               survey-mode     08:5b:0e:4f:af:38       80
9               survey-mode     08:5b:0e:ce:59:40       117
10              survey-mode     08:5b:0e:4f:af:44       0
 

NOTE: The FortiSwitch unit creates an entry in the layer-3 database using the exact packet contents when they were parsed. If the MAC address is then assigned to a different VLAN, this change might not be detected immediately. If there is a discrepancy in the output for the diagnose switch network-monitor dump-l2-db and diagnose switch network-monitor dump-l3-db commands, use the output with the more recent time stamp.

To see all detected devices from the layer-2 database, use the following command:

diagnose switch network-monitor dump-l2-db

 

mac 00:01:02:03:04:05 vlan 1

created 19 secs ago, last seen 16 secs ago

user JoE sources: eapol

 

To see all detected devices from the IP address database, use the following command:

diagnose switch network-monitor dump-l3-db

 

mac 08:5b:0e:c1:07:65 ip 169.254.2.2 vlan 4094

created 63614 secs ago, last seen 2 secs ago

sources: arp ip

mac 00:10:20:30:40:50 ip 10.10.10.111 vlan 123

created 75 secs ago, last seen 45 secs ago

sources: arp ip

mac 00:11:22:33:44:55 ip 30.30.30.115 vlan 1

created 53 secs ago, last seen 53 secs ago

sources: dhcp arp ip

Network monitoring

You can monitor specific unicast MAC addresses in directed mode, monitor all detected MAC addresses on a FortiSwitch unit in survey mode, or do both. The FortiSwitch unit gives the directed mode a higher priority than survey mode. The directed mode and survey mode are disabled by default.

NOTE: Network monitoring is not available on FSR-112D-POE.

This section covers the following topics:

Directed mode

In directed mode, you select which unicast MAC addresses that you want examined. The FortiSwitch unit detects various fields of the packet—such as MAC address, IP address, VLAN, and user name—and stores the data in either of two databases.

NOTE: You cannot specify broadcast or multicast MAC addresses.

The maximum number of MAC addresses that can be monitored depends on the FortiSwitch model.

Platform Series

Maximum Number of MAC Addresses Monitored

Maximum Number of Hosts

1xx, 2xx

10

250

4xx, 5xx

20

1,024

10xx, 30xx

30

4,096

To find out how many network monitors are available, use the following command:

diagnose switch network-monitor cfg-stats

 

Network Monitor Configuration Statistics:

----------------------------------

Adds         : 0

Deletes      : 0

Free Entries : 20

 

To find out which network monitors are being used currently, use the following command:

diagnose switch network-monitor dump-monitors

 

Entry ID       Monitor Type       Monitor MAC      Packet-count
=================================================================
1               directed-mode   00:01:02:03:04:05       10
2               directed-mode   10:01:02:03:04:05       0
3               survey-mode     08:5b:0e:c1:07:65       419
4               survey-mode     08:5b:0e:4f:af:38       101
5               survey-mode     08:5b:0e:ce:59:40       2347
6               survey-mode     08:5b:0e:4f:af:44       0
7               survey-mode     08:5b:0e:c1:07:65       0
8               survey-mode     08:5b:0e:4f:af:38       80
9               survey-mode     08:5b:0e:ce:59:40       117
10              survey-mode     08:5b:0e:4f:af:44       0

 

To start network monitoring, use the following commands:

config switch network-monitor settings

set status enable

end

 

To specify a single unicast MAC address (formatted like this: xx:xx:xx:xx:xx:xx) to be monitored, use the following commands:

config switch network-monitor directed

edit <unused network monitor>

set monitor-mac <MAC address>

next

end

 

For example:

config switch network-monitor directed

edit 1

set monitor-mac 00:25:00:61:64:6d

next

end

Survey mode

In survey mode, the FortiSwitch unit detects MAC addresses to monitor for a specified number of seconds. You can specify network monitoring for 120 to 3,600 seconds. The default time is 120 seconds. The FortiSwitch unit detects various fields of the packet—such as MAC address, IP address, VLAN, and user name—and stores the data in either of two databases.

To start network monitoring in survey mode, use the following commands:

config switch network-monitor settings

set status enable

set survey-mode enable

set survey-mode-interval <120-3600 seconds>

end

 

For example:

config switch network-monitor settings

set status enable

set survey-mode enable

set survey-mode-interval 480

end

Network monitoring statistics

After you have enabled network monitoring, you can view the statistics for the number and types of packets.

To see the type of packets going to and from monitored MAC addresses, use the following command:

diagnose switch network-monitor parser-stats

 

Network Monitor Parser Statistics:

----------------------------------

Arp         : 0

Ip          : 1

Udp         : 46

Tcp         : 353

Dhcp        : 0

Eapol       : 0

Unsupported : 352

 

To see the number of packets going to and from monitored MAC addresses, use the following command:

diagnose switch network-monitor dump-monitors

 

Entry ID       Monitor Type       Monitor MAC      Packet-count
=================================================================
1               directed-mode   00:01:02:03:04:05       10
2               directed-mode   10:01:02:03:04:05       0
3               survey-mode     08:5b:0e:c1:07:65       419
4               survey-mode     08:5b:0e:4f:af:38       101
5               survey-mode     08:5b:0e:ce:59:40       2347
6               survey-mode     08:5b:0e:4f:af:44       0
7               survey-mode     08:5b:0e:c1:07:65       0
8               survey-mode     08:5b:0e:4f:af:38       80
9               survey-mode     08:5b:0e:ce:59:40       117
10              survey-mode     08:5b:0e:4f:af:44       0
 

NOTE: The FortiSwitch unit creates an entry in the layer-3 database using the exact packet contents when they were parsed. If the MAC address is then assigned to a different VLAN, this change might not be detected immediately. If there is a discrepancy in the output for the diagnose switch network-monitor dump-l2-db and diagnose switch network-monitor dump-l3-db commands, use the output with the more recent time stamp.

To see all detected devices from the layer-2 database, use the following command:

diagnose switch network-monitor dump-l2-db

 

mac 00:01:02:03:04:05 vlan 1

created 19 secs ago, last seen 16 secs ago

user JoE sources: eapol

 

To see all detected devices from the IP address database, use the following command:

diagnose switch network-monitor dump-l3-db

 

mac 08:5b:0e:c1:07:65 ip 169.254.2.2 vlan 4094

created 63614 secs ago, last seen 2 secs ago

sources: arp ip

mac 00:10:20:30:40:50 ip 10.10.10.111 vlan 123

created 75 secs ago, last seen 45 secs ago

sources: arp ip

mac 00:11:22:33:44:55 ip 30.30.30.115 vlan 1

created 53 secs ago, last seen 53 secs ago

sources: dhcp arp ip