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Virus Throttling (5300xl Switches Only)

Operating Rules

■ When configuring or changing the configuration of connection-rate

filters in the switch, execute the clear arp command to reset the

routing table.

■ Connection-Rate filtering is triggered by inbound IP routed traffic

exhibiting high rates of IP connections to new hosts. Inbound

switched traffic with high IP connection rates does not trigger

connection-rate filtering. However, after connection-rate filtering has

been triggered on a port, all traffic (switched or routed) from the

suspect host is subject to the configured connection-rate policy

(notify-only, throttle, or block).

■ Where the switch is throttling or blocking inbound routed traffic from

a host, any outbound routed or switched traffic for that host is still

permitted.

■ A host blocked by connection-rate filtering remains blocked until

explicitly unblocked by one of the following:

• The vlan < vid > connection-rate-filter unblock command (page 3-18)

• Rebooting the switch

• Disabling connection-rate filtering using the no connection-rate-filter

command.

• Deleting a VLAN removes blocks on any hosts on that VLAN.

Note that changing a port setting from Block to either Throttle or Notify-

Only, does not unblock a blocked host on any port previously set to block.

3-8

HP ProCurve 3400cl-24G Access Security Guide

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