Brocade TurboIron 24X Series Configuration Guide - Manual (Page 668)

634 Brocade TurboIron 24X Series Configuration Guide
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Configuring OSPF
The <ACL-name> | <ACL-id> parameter specifies the ACL name or ID.
The deny | permit parameter indicates whether packets that match the policy are dropped or
forwarded.
The <ip-protocol> parameter indicates the type of IP packet you are filtering. When using an
extended ACL as input for an OSPF distribution list, specify ip.
Since this ACL is input to an OSPF distribution list, the <source-ip> parameter actually specifies the
destination network of the route.
The <wildcard> parameter specifies the portion of the source address to match against. The
<wildcard> is in dotted-decimal notation (IP address format). It is a four-part value, where each
part is 8 bits (one byte) separated by dots, and each bit is a one or a zero. Each part is a number
ranging from 0 to 255, for example 0.0.0.255. Zeros in the mask mean the packet source address
must match the <source-ip>. Ones mean any value matches. For example, the <source-ip> and
<wildcard> values 10.4.0.0 0.255.255.255 mean that all 10.4.x.x networks match the ACL.
If you want the policy to match on all network addresses, enter any any.
If you prefer to specify the wildcard (mask value) in Classless Interdomain Routing (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 “10.4.0.0 0.255.255.255” as
“10.4.0.0/8”. 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.
NOTE
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.
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 commands.
Since this ACL is input to an OSPF distribution list, the <destination-ip> parameter actually
specifies the subnet mask of the route.
The <wildcard> parameter specifies the portion of the subnet mask to match against. For
example, the <destination-ip> and <wildcard> values 255.255.255.255 0.0.0.255 mean that
subnet mask /24 and longer match the ACL.
If you want the policy to match on all network masks, enter any any.
Modify default metric for redistribution
The default metric is a global parameter that specifies the cost applied to all OSPF routes by
default. The default value is 10. You can assign a cost from 1 – 15.
NOTE
You also can define the cost on individual interfaces. The interface cost overrides the default cost.
To assign a default metric of 4 to all routes imported into OSPF, enter the following commands.