Reference Guide

200 | Access Control Lists (ACL)
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When you use the log option, CP processor logs details about the packets that match. Depending on
how many packets match the log entry and at what rate, the CP may become busy as it has to log these
packets’ details.
The C-Series and S-Series cannot count both packets and bytes, so when you enter the count byte
options, only bytes are incremented.
The monitor option is relevant in the context of flow-based monitoring only. See the Chapter 30, Port
Monitoring.
Related
Commands
permit arp
e
Configure a filter that forwards ARP packets meeting this criteria.This command is supported only on
12-port GE line cards with SFP optics; refer to your line card documentation for specifications.
Syntax
permit arp {destination-mac-address mac-address-mask | any} vlan vlan-id {ip-address |
any | opcode code-number} [count [byte] | log] [order] [monitor] [fragments]
To remove this filter, use one of the following:
• Use the no seq sequence-number command syntax if you know the filter’s sequence number or
• Use the no permit arp {destination-mac-address mac-address-mask | any} vlan vlan-id
{ip-address | any | opcode code-number} command.
Parameters
Note: When ACL logging and byte counters are configured simultaneously, byte counters
may display an incorrect value. Configure packet counters with logging instead.
ip access-list extended Create an extended ACL.
permit tcp Assign a permit filter for TCP packets.
permit udp Assign a permit filter for UDP packets.
destination-mac-address
mac-address-mask
Enter a MAC address and mask in the nn:nn:nn:nn:nn format.
For the MAC address mask, specify which bits in the MAC address must
match.
The MAC ACL supports an inverse mask, therefore, a mask of ff:ff:ff:ff:ff:ff
allows entries that do not match and a mask of 00:00:00:00:00:00 only
allows entries that match exactly.
any Enter the keyword any to match and drop any ARP traffic on the interface.
vlan vlan-id Enter the keyword vlan followed by the VLAN ID to filter traffic associated
with a specific VLAN.
Range: 1 to 4094, 1-2094 for ExaScale (can used IDs 1-4094)
To filter all VLAN traffic specify VLAN 1.
ip-address
Enter an IP address in dotted decimal format (A.B.C.D) as the target IP
address of the ARP.
opcode code-number Enter the keyword opcode followed by the number of the ARP opcode.
Range: 1 to 16.
count (OPTIONAL) Enter the keyword count to count packets processed by the
filter.