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Configuring IS-IS Configuring IS-IS
OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007 page 3-27
a result, if there is no match for the metric value in sequence 10, then the match interface statement in
sequence 20 is processed. However, if a route matches the metric value 8, then sequence 20 is not used.
The set statement for whichever sequence was matched is applied.
A route map sequence may contain multiple match statements. If these statements are of the same kind
(e.g., match metric 5, match metric 8, etc.) then a logical OR is implied between each like statement. If the
match statements specify different types of matches (e.g. match metric 8, match ip4 interface to-finance,
etc.), then a logical AND is implied between each statement. For example, the following route map
sequence will redistribute a route if its metric value is either 8 or 5:
-> ip route-map rm_1 sequence-number 10 action permit
-> ip route-map rm_1 sequence-number 10 match metric 5
-> ip route-map rm_1 sequence-number 10 match metric 8
The following route map sequence will redistribute a route if the route has a metric of 8 or 5 and if the
route was learned on the IPv4 interface to-finance:
-> ip route-map rm_1 sequence-number 10 action permit
-> ip route-map rm_1 sequence-number 10 match metric 5
-> ip route-map rm_1 sequence-number 10 match metric 8
-> ip route-map rm_1 sequence-number 10 match ipv4-interface to-finance
Configuring Access Lists
An IP access list provides a convenient way to add multiple IPv4 addresses to a route map. Using an
access list avoids having to enter a separate route map statement for each individual IP address. Instead, a
single statement is used that specifies the access list name. The route map is then applied to all the
addresses contained within the access list.
Configuring an IP access list involves two steps: creating the access list and adding IP addresses to the list.
To create an IP access list, use the ip access-list and specify a name to associate with the list. For exam-
ple,
-> ip access-list ipaddr
To add addresses to an access list, use the ip access-list address command. For example, the following
commands add addresses to an existing access list:
-> ip access-list ipaddr address 16.24.2.1/16
Use the same access list name each time the above commands are used to add additional addresses to the
same access list. In addition, both commands provide the ability to configure if an address and/or its
matching subnet routes are permitted (the default) or denied redistribution. For example:
-> ip access-list ipaddr address 16.24.2.1/16 action deny redist-control all-
subnets
For more information about configuring access list commands, see the “IP Commands” chapter in the
OmniSwitch CLI Reference Guide.