4 Command Line Interface

The following restrictions apply to ACLs:

•This switch supports ACLs for both ingress and egress filtering. However, you can only bind one IP ACL and one MAC ACL to any port for ingress filtering, and one IP ACL and one MAC ACL to any port for egress filtering. In other words, only four ACLs can be bound to an interface – Ingress IP ACL, Egress IP ACL, Ingress MAC ACL and Egress MAC ACL.

•When an ACL is bound to an interface as an egress filter, all entries in the ACL must be deny rules. Otherwise, the bind operation will fail.

•Each ACL can have up to 32 rules.

•The maximum number of ACLs is also 32.

•However, due to resource restrictions, the average number of rules bound the ports should not exceed 20.

•You must configure a mask for an ACL rule before you can bind it to a port or set the queue or frame priorities associated with the rule.

•The switch does not support the explicit “deny any any” rule for the egress IP ACL or the egress MAC ACLs. If these rules are included in ACL, and you attempt to bind the ACL to an interface for egress checking, the bind operation will fail.

•Egress MAC ACLs only work for destination-mac-known packets, not for multicast, broadcast, or destination-mac-unknown packets.

The order in which active ACLs are checked is as follows:

1.User-defined rules in the Egress MAC ACL for egress ports.

2.User-defined rules in the Egress IP ACL for egress ports.

3.User-defined rules in the Ingress MAC ACL for ingress ports.

4.User-defined rules in the Ingress IP ACL for ingress ports.

5.Explicit default rule (permit any any) in the ingress IP ACL for ingress ports.

6.Explicit default rule (permit any any) in the ingress MAC ACL for ingress ports.

7.If no explicit rule is matched, the implicit default is permit all.

Masks for Access Control Lists

You must specify masks that control the order in which ACL rules are checked. The switch includes two system default masks that pass/filter packets matching the permit/deny the rules specified in an ingress ACL. You can also configure up to seven user-defined masks for an ACL. A mask must be bound exclusively to one of the basic ACL types (i.e., Ingress IP ACL, Egress IP ACL, Ingress MAC ACL or Egress MAC ACL), but a mask can be bound to up to four ACLs of the same type.

Table 4-33 Access Control List Commands

Command Groups

Function

Page

 

 

 

IP ACLs

Configures ACLs based on IP addresses, TCP/UDP port number,

4-89

 

protocol type, and TCP control code

 

MAC ACLs

Configures ACLs based on hardware addresses, packet format, and

4-99

 

Ethernet type

 

ACL Information

Displays ACLs and associated rules; shows ACLs assigned to each port

4-106

 

 

 

4-88

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Microsoft ES4625, ES4649 manual Protocol type, and TCP control code MAC ACLs, Ethernet type ACL Information
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ES4649, ES4625 specifications

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