72 | Access Control Lists (ACLs)
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IP Access Control Lists (ACLs)
In the Dell Force10 switch/routers, you can create two different types of IP ACLs: standard or extended. A
standard ACL filters packets based on the source IP packet. An extended ACL filters packets based on the
following criteria:
• IP protocol number
• Source IP address
• Destination IP address
• Source TCP port number
• Destination TCP port number
• Source UDP port number
• Destination UDP port number
For more information about ACL supported options, refer to the FTOS Command Reference Guide.
For extended ACL TCP and UDP filters, you can match criteria on specific or ranges of TCP or UDP
ports. For extended ACL TCP filters, you can also match criteria on established TCP sessions.
When creating an access list, the sequence of the filters is important. You have a choice of assigning
sequence numbers to the filters as you enter them, or FTOS assigns numbers in the order the filters are
created. The sequence numbers, whether configured or assigned by FTOS, are listed in the
show config and
show ip accounting access-list command display output.
Ingress and egress Hot Lock ACLs allow you to append or delete new rules into an existing ACL (already
written into the content addressable memory [CAM]) without disrupting traffic flow. Existing entries in
CAM are shuffled to accommodate the new entries. Hot Lock ACLs are enabled by default and support
both standard and extended ACLs.
Implementing ACLs on FTOS
You can assign one IP ACL per interface with FTOS. If an IP ACL is not assigned to an interface, it is not
used by the software in any other capacity.
The number of entries allowed per ACL is hardware-dependent.
If counters are enabled on IP ACL rules that are already configured, those counters are reset when a new
rule is inserted or prepended. If a rule is appended, the existing counters are not affected. This is applicable
to the following features:
• L2 Ingress Access list
• L2 Egress Access list
Note: Hot Lock ACLs are supported for Ingress ACLs only.
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