Chapter 26 IP Source Guard
The following table describes the labels in this screen.
Table 86 ARP Inspection Configure
LABEL | DESCRIPTION |
Active | Select this to enable ARP inspection on the Switch. You still have to |
| enable ARP inspection on specific VLAN and specify trusted ports. |
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Filter Aging Time |
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Filter aging | This setting has no effect on existing MAC address filters. |
time | Enter how long |
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| remains in the Switch after the Switch identifies an unauthorized ARP |
| packet. The Switch automatically deletes the MAC address filter |
| afterwards. Type 0 if you want the MAC address filter to be |
| permanent. |
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Log Profile |
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Log buffer size | Enter the maximum number |
| generated by ARP packets and have not been sent to the syslog server |
| yet. Make sure this number is appropriate for the specified Syslog |
| rate and Log interval. |
| If the number of log messages in the Switch exceeds this number, the |
| Switch stops recording log messages and simply starts counting the |
| number of entries that were dropped due to unavailable buffer. Click |
| Clearing log status table in the ARP Inspection Log Status |
| screen to clear the log and reset this counter. See Section 26.6.2 on |
| |
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Syslog rate | Type the maximum number of syslog messages the Switch can send |
| to the syslog server in one batch. This number is expressed as a rate |
| because the batch frequency is determined by the Log Interval. You |
| must configure the syslog server (Chapter 48 on page 425) to use |
| this. Enter 0 if you do not want the Switch to send log messages |
| generated by ARP packets to the syslog server. |
| The relationship between Syslog rate and Log interval is illustrated |
| in the following examples: |
| • 4 invalid ARP packets per second, Syslog rate is 5, Log interval |
| is 1: the Switch sends 4 syslog messages every second. |
| • 6 invalid ARP packets per second, Syslog rate is 5, Log interval |
| is 2: the Switch sends 5 syslog messages every 2 seconds. |
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Log interval | Type how often |
| messages to the syslog server. Enter 0 if you want the Switch to send |
| syslog messages immediately. See Syslog rate for an example of the |
| relationship between Syslog rate and Log interval. |
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Apply | Click Apply to save your changes to the Switch’s |
| The Switch loses these changes if it is turned off or loses power, so |
| use the Save link on the top navigation panel to save your changes to |
| the |
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Cancel | Click this to reset the values in this screen to their |
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