Reference Guide

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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 Figure 7-30, 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
TenGigabitethernet interface 0/0 and that have a metric of 255 will be redistributed into the OSPF
backbone area.
Figure 7-30. Route Redistribution into OSPF
Configuring 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 Figure 7-31, 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.
Figure 7-31. Tagging OSPF Routes Entering a RIP Routing Domain
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.
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
!
router rip
redistribute ospf 34 metric 1 route-map torip
!
route-map torip permit 10
match route-type internal
set tag 34
!