A
CCESS
C
ONTROL
L
IST
C
OMMANDS
24-10
Default Setting
None
Command Mode
IP Mask
Command Usage
Packets crossing a port are checked against all the rules in the ACL
until a match is found. The order in which thes e packets are checked
is determined by the mask, and not the order in which the ACL rules
were entered.
First create the required ACLs and ingress or egress masks before
mapping an ACL to an interface.
If you enter dscp, you cannot enter tos or precedence. You can enter
both tos and precedence without dscp.
Masks that include an entry for a Layer 4 protocol s ource port or
destination port can only be applied to packets with a header length of
exactly five bytes.
Example
This example creates an IP ingress mask with two rules. Each rule is
checked in order of precedence to look for a match in the ACL entries.
The first entry matching a mask is applied to th e inbound packet.
Console(config)#access-list ip mask-precedence in
Console(config-ip-mask-acl)#mask host any
Console(config-ip-mask-acl)#mask 255.255.255.0 any
Console(config-ip-mask-acl)#