Router R1 is redistributing between two OSPF processes. Given the configuration shown,
which includes all commands in the route map named fred, which of the following answers is
true regarding the redistribution into OSPF process 1?
router ospf 1
redistribute ospf 2 external 2 route-map fred
!
route-map fred permit 10
match ip address 1
set metric-type type-1
A.
No routes are redistributed because a route cannot be both E1 and E2.
B.
Only OSPF E2 routes in the OSPF 2 domain will be considered for redistribution.
C.
Inside the OSPF 2 domain, any formerly E2 routes will become E1 routes.
D.
Routes permitted by ACL 1 will be redistributed, regardless of whether the routes are E1
or E2 routes.
Explanation:
The external 2 parameters on the redistribute command act as matching logic; only routes
from the source routing protocol (in this case OSPF 2) that match this extra logic will be
considered for redistribution by this redistribute command. The set metric-type type-1 routemap subcommand sets the route type as it is injected into the destination routing protocol (in
this case OSPF 1); this logic is not used for matching the source routes. The routes
permitted by ACL 1 will be redistributed, but only those that are also E2 routes from the
(source) OSPF 2 domain. The redistribute function will not change the attributes of routes
inside a single routing domain, but only in the destination routing domain (OSPF 1), so the
configuration has no effect on the OSPF 2 routes that remain in OSPF 2.