Dell S6100, Руководство по настройке

Страница: 309 / 1743

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
• ip access-list extended — create an extended ACL.
• permit — assign a permit filter for IP packets.
• permit udp — assign a permit filter for UDP packets.
seq arp (for Extended MAC ACLs)
Configure an egress filter with a sequence number that filters ARP packets meeting this criteria. This command is supported only on 12-
port GE line cards with SFP optics. For specifications, refer to your line card documentation.
NOTE: Only the options that have been newly introduced in Release 9.3(0.0) and Release 9.4(0.0) are described here. For a
complete description on all of the keywords and variables that are available with this command, refer the topic of this command
discussed earlier in this guide.
Syntax seq sequence-number {deny | permit} arp { destination-mac-address mac-address-
mask | any} vlan vlan-id { ip-address | any | opcode code- number } [count [byte]]
[order] [log [interval minutes ] [threshold-in-msgs [ count ]] [monitor]
To remove this filter, use the no seq sequence-number command.
Parameters
log (OPTIONAL) Enter the keyword
log
to enable the triggering of ACL log messages.
threshold-in msgs
count
(OPTIONAL) Enter the
threshold-in-msgs
keyword followed by a value to indicate
the maximum number of ACL logs that can be generated, exceeding which the generation
of ACL logs is terminated. with the seq, permit, or deny commands. You can enter a
threshold in the range of 1-100.
interval minutes (OPTIONAL) Enter the keyword
interval
followed by the time period in minutes at
which ACL logs must be generated. You can enter an interval in the range of 1-10 minutes.
monitor (OPTIONAL) Enter the keyword
monitor
when the rule is describing the traffic that you
want to monitor and the ACL in which you are creating the rule is applied to the
monitored interface.
Defaults
By default, 10 ACL logs are generated if you do not specify the threshold explicitly.
The default frequency at which ACL logs are generated is 5 minutes. By default, flow-based monitoring is not
enabled.
Command Modes CONFIGURATION-EXTENDED-ACCESS-LIST
Access Control Lists (ACL) 309