Chapter 26 IP Source Guard

open this screen, click Advanced Application > IP Source Guard > ARP Inspection > Configure > Port.

Figure 127 ARP Inspection Port Configure

The following table describes the labels in this screen.

Table 91 ARP Inspection Port Configure

LABEL

DESCRIPTION

Port

This field displays the port number. If you configure the * port, the settings are applied to all

 

of the ports.

 

 

Trusted State

Select whether this port is a trusted port (Trusted) or an untrusted port (Untrusted).

 

The Switch does not discard ARP packets on trusted ports for any reason.

 

The Switch discards ARP packets on untrusted ports in the following situations:

 

• The sender’s information in the ARP packet does not match any of the current bindings.

 

• The rate at which ARP packets arrive is too high. You can specify the maximum rate at

 

which ARP packets can arrive on untrusted ports.

 

 

LimitRate and Burst Interval settings have no effect on trusted ports.

 

 

Rate (pps)

Specify the maximum rate (1-2048 packets per second) at which the Switch receives ARP

 

packets from each port. The Switch discards any additional ARP packets. Enter 0 to disable

 

this limit.

 

 

Burst interval

The burst interval is the length of time over which the rate of ARP packets is monitored for

(seconds)

each port. For example, if the Rate is 15 pps and the burst interval is 1 second, then the

 

Switch accepts a maximum of 15 ARP packets in every one-second interval. If the burst

 

interval is 5 seconds, then the Switch accepts a maximum of 75 ARP packets in every five-

 

second interval.

 

Enter the length (1-15 seconds) of the burst interval.

 

 

Apply

Click Apply to save your changes to the Switch’s run-time memory. 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 non-volatile memory when you are done configuring.

 

 

Cancel

Click this to reset the values in this screen to their last-saved values.

 

 

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ES3500 Series User’s Guide