OSPF line redistribution is an essential matter on the BSCI exam, and it's a matter flooded of info and defaults that you requirement to undergo for the communicating shack and the job. To support you transfer the BSCI exam, here's a hurried analyse of whatever of the OSPF line redistribution basics.
To wager if a router is an ABR or ASBR, separate exhibit ip ospf. This also displays some routes existence redistributed into OSPF on this router.
R1#show ip ospf
Routing Process ospf 1 with ID 1.1.1.1
Supports exclusive azygos TOS(TOS0) routes
Supports mirky LSA
It is an Atlantic abut and liberated grouping bounds router
Redistributing External Routes from,
connected, includes subnets in redistribution
rip, includes subnets in redistribution
When redistributing RIP into OSPF, the subnets choice is necessary to allow subnets in redistribution. When redistributing OSPF into RIP, a cum amount staleness be specified. (OSPF gives redistributed routes a choice amount of 20 this crapper be changed, but a cum amount does not hit to be set.)
R1(config)#router ospf 1
R1(config-router)#redistribute connected
% Only classful networks module be redistributed
R1(config-router)#redistribute adjoining subnets
R1(config-router)#redistribute countercurrent subnets
R1(config-router)#router rip
R1(config-router)#redistribute adjoining amount 1
R1(config-router)#redistribute ospf 1 amount 1
By default, routes redistributed into OSPF are scarred as E2 routes. The amount for these routes reflects exclusive the outlay of the line from the ASBR to the instruction meshwork and does not allow the outlay of the line from the topical router to the ASBR. By contrast, E1 routes allow the outlay of the whole line from the topical router to the instruction network.
O E2 5.1.1.1 [110/20 via 172.34.34.3, 00:33:21, Ethernet0
6.0.0.0/32 is subnetted, 1 subnets
O E2 6.1.1.1 [110/20 via 172.34.34.3, 00:33:21, Ethernet0
172.12.0.0/16 is variably subnetted, 2 subnets, 2 masks
O E2 172.12.21.0/30 [110/20 via 172.34.34.3, 00:33:32, Ethernet0
O E2 7.1.1.1 [110/20 via 172.34.34.3, 00:33:21, Ethernet0
15.0.0.0/24 is subnetted, 1 subnets
O E2 15.1.1.0 [110/20 via 172.34.34.3, 00:33:32, Ethernet0
To redistribute routes into OSPF and evaluation them as E1 upon redistribution, ingest the metric-type choice with the redistribution command.
R1(config)#router ospf 1
R1(config-router)#redistribute countercurrent subnets metric-type ?
1 Set OSPF External Type 1 metrics
2 Set OSPF External Type 2 metrics
R1(config-router)#redistribute countercurrent subnets metric-type 1
Look at the aforementioned digit routes in R4's routing table, which are today displayed as E1 routes:
O E1 5.1.1.1 [110/94 via 172.34.34.3, 00:04:13, Ethernet0
6.0.0.0/32 is subnetted, 1 subnets
O E1 6.1.1.1 [110/94 via 172.34.34.3, 00:04:14, Ethernet0
BSCI communicating success and earning your CCNP authorisation depends on lettered the details, and there are plentitude of info participating in OSPF line redistribution! Keep studying, training assorted scenarios in your CCNA / CCNP bag work or demolition rental, and you'll officer these info and transfer the exam!
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