Brocade BigIron RX Series Configuration Guide - Manual (Page 725)

BigIron RX Series Configuration Guide 647
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Configuring a PBR policy
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Syntax: [no] access-list <num> deny | permit host <source-ip> | <hostname>
Syntax: [no] access-list <num> deny | permit any
The <num> parameter is the access list number and can be from 1 – 99.
The deny | permit parameter indicates whether packets that match a policy in the access list are
denied (dropped) or permitted (forwarded).
The <source-ip> parameter specifies the source IP address. Alternatively, you can specify the host
name.
NOTE
If you are configuring the ACL for use in a route map, always specify permit. Otherwise, the device
will ignore deny clauses and packets that match deny clauses that are routed normally.
NOTE
To specify the host name instead of the IP address, the host name must be configured using the
Brocade device’s DNS resolver. To configure the DNS resolver name, use the ip dns server-address…
command at the global CONFIG level of the CLI.
The <wildcard> parameter specifies the mask value to compare against the host address specified
by the <source-ip> parameter. The <wildcard> is a four-part value in dotted-decimal notation (IP
address format) consisting of ones and zeros. Zeros in the mask mean the packet’s source
address must match the <source-ip>. Ones mean any value matches. For example, the
<source-ip> and <wildcard> values 209.157.22.26 0.0.0.255 mean that all hosts in the Class C
subnet 209.157.22.x match the policy.
If you prefer to specify the wildcard (mask value) in CIDR format, you can enter a forward slash after
the IP address, then enter the number of significant bits in the mask. For example, you can enter
the CIDR equivalent of “209.157.22.26 0.0.0.255” as “209.157.22.26/24”. The CLI automatically
converts the CIDR number into the appropriate ACL mask (where zeros instead of ones are the
significant bits) and changes the non-significant portion of the IP address into zeros. For example,
if you specify 209.157.22.26/24 or 209.157.22.26 0.0.0.255, then save the changes to the
startup-config file, the value appears as 209.157.22.0/24 (if you have enabled display of subnet
lengths) or 209.157.22.0 0.0.0.255 in the startup-config file.
If you enable the software to display IP subnet masks in CIDR format, the mask is saved in the file
in “/<mask-bits>” format. To enable the software to display the CIDR masks, enter the ip
show-subnet-length command at the global CONFIG level of the CLI. You can use the CIDR format
to configure the ACL entry regardless of whether the software is configured to display the masks in
CIDR format.
NOTE
If you use the CIDR format, the ACL entries appear in this format in the running-config and
startup-config files, but are shown with subnet mask in the display produced by the show ip
access-list command.
The host <source-ip> | <hostname> parameter lets you specify a host IP address or name. When
you use this parameter, you do not need to specify the mask. A mask of all zeros (0.0.0.0) is
implied.
The any parameter configures the policy to match on all host addresses.
NOTE
Do not use the log option in ACLs that will be used for PBR.