Service Manual

count for that new interval commences from zero. If ACL logging was stopped previously because the configured
threshold is exceeded, it is re-enabled for this new interval.
If ACL logging is stopped because the configured threshold is exceeded, it is re-enabled after the logging interval
period elapses. ACL logging is supported for standard and extended IPv4 ACLs, IPv6 ACLs, and MAC ACLs. You
can configure ACL logging only on ACLs that are applied to ingress interfaces; you cannot enable logging for ACLs
that are associated with egress interfaces.
You can activate flow-based monitoring for a monitoring session by entering the flow-based enable
command in the Monitor Session mode. When you enable this capability, traffic with particular flows that are
traversing through the ingress and egress interfaces are examined and, appropriate ACLs can be applied in both
the ingress and egress direction. Flow-based monitoring conserves bandwidth by monitoring only specified traffic
instead all traffic on the interface. This feature is particularly useful when looking for malicious traffic. It is available
for Layer 2 and Layer 3 ingress and egress traffic. You may specify traffic using standard or extended access-lists.
This mechanism copies all incoming or outgoing packets on one port and forwards (mirrors) them to another port.
The source port is the monitored port (MD) and the destination port is the monitoring port (MG).
Related Commands
deny — assigns a IP ACL filter to deny IP packets.
ip access-list standard — creates a standard ACL.
permit arp
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] [log [inteval minutes] [threshold-in-msgs [count]] [monitor]
To remove this filter, you have two choices:
• Use the no seq sequence-number command if you know the filter’s sequence number.
•
Use the {destination-mac-address mac-address-mask | any} vlan vlan-id {ip-
address | any | opcode code-number} command.
Parameters
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 specific Ethernet traffic on the interface.
vlan vlan-id Enter the keyword vlan and then enter the VLAN ID to filter traffic associated with a
specific VLAN. The range is 1 to 4094 and 1 to 2094 for ExaScale (you can use IDs 1 to
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.
Access Control Lists (ACL) 217