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Route maps add to that redistribution capability by allowing you to match specific routes and set or change
more attributes when redistributing those routes.
In the following example, the
redistribute command calls the route map static ospf to redistribute
only certain static routes into OSPF. According to the route map static ospf, only routes that have a
next hop of Gigabitethernet interface 0/0 and that have a metric of 255 will be redistributed into the OSPF
backbone area.
router ospf 34
default-information originate metric-type 1
redistribute static metric 20 metric-type 2 tag 0 route-map staticospf
!
route-map staticospf permit 10
match interface GigabitEthernet 0/0
match metric 255
set level backbone
Configure a route map for route tagging
One method for identifying routes from different routing protocols is to assign a tag to routes from that
protocol. As the route enters a different routing domain, it is tagged and that tag is passed along with the
route as it passes through different routing protocols. This tag can then be used when the route leaves a
routing domain to redistribute those routes again.
In the following example, the
redistribute ospf command with a route map is used in the ROUTER RIP
mode to apply a tag of 34 to all internal OSPF routes that are redistributed into RIP.
!
router rip
redistribute ospf 34 metric 1 route-map torip
!
route-map torip permit 10
match route-type internal
set tag 34
!
Continue clause
Normally, when a match is found, set clauses are executed, and the packet is then forwarded; no more
route-map modules are processed. If the
continue command is configured at the end of a module, the next
module (or a specified module) is processed even after a match is found. The following example shows a
continue clause at the end of a route-map module. In this example, if a match is found in the route-map
“test” module 10, module 30 will be processed.
Note: When re-distributing routes using route-maps, the user must take care to create the
route-map defined in the redistribute command under the routing protocol. If no route-map is
created, then NO routes are redistributed.
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