Virus Throttling (5300xl Switches Only)
Configuring and Applying Connection-Rate ACLs
For more on ACE masks, refer to “How an ACE Uses a Mask To Screen Packets
for Matches” in the chapter titled “Access Control Lists (ACLs for the Series
5300xl Switches” in the Advanced Traffic Management Guide for your switch.
Example of Using an ACL in a Connection-Rate
Configuration
This example adds connection-rate ACLs to the basic example on page 3-14.
Server
Company
Intranet
VLAN 1
15.45.100.1
VLAN 10
15.45.200.1
VLAN 15
15.45.300.1
Switch
Server
Server
Switch
Switch
A
B
C
D
E
H
F
G
B1
B2
B3
B9
B4
D1
D2
5300xl Switch
Server
IP Address:
15.45.100.7
IP Address: 15.45.50.17
Figure 3-10. Sample Network
In the basic example on page 3-14, the administrator configured connection-
rate blocking on port D2. However:
■ The administrator has elevated the connection-rate sensitivity to high.
■ The server at IP address 15.45.50.17 frequently transmits a relatively
high rate of legitimate connection requests, which now triggers
connection-rate blocking of the server’s IP address on port D2. This
causes periodic, unnecessary blocking of access to the server.
3-27
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