OSPF Route Redistribution Is An Important Topic On The BSCI Exam, And It's A Topic Full Of Details And Defaults That You Need To Know For The Exam Room And The Job. To Help You Pass The BSCI Exam, Here's A Quick Review Of Some Of The OSPF Route Redistribution Basics.To See If A Router Is An ABR Or ASBR, Run Show Ip Ospf. This Also Displays Any Routes Being Redistributed Into OSPF On This Router.R1show Ip OspfRouting Process "ospf 1" With ID 1.1.1.1Supports Only Single TOS(TOS0) RoutesSupports Opaque LSAIt Is An Area Border And Autonomous System Boundary RouterRedistributing External Routes From,connected, Includes Subnets In Redistributionrip, Includes Subnets In RedistributionWhen Redistributing RIP Into OSPF, The Subnets" Option Is Needed To Include Subnets In Redistribution. When Redistributing OSPF Into RIP, A Seed Metric Must Be Specified. (OSPF Gives Redistributed Routes A Default Metric Of 20 This Can Be Changed, But A Seed Metric Does Not Have To Be Set.)R1(config)router Ospf 1R1(config-router)redistribute Connected Only Classful Networks Will Be RedistributedR1(config-router)redistribute Connected SubnetsR1(config-router)redistribute Rip SubnetsR1(config-router)router RipR1(config-router)redistribute Connected Metric 1R1(config-router)redistribute Ospf 1 Metric 1 By Default, Routes Redistributed Into OSPF Are Marked As E2 Routes. The Metric For These Routes Reflects Only The Cost Of The Path From The ASBR To The Destination Network And Does Not Include The Cost Of The Path From The Local Router To The ASBR. By Contrast, E1 Routes Include The Cost Of The Entire Path From The Local Router To The Destination Network.O E2 5.1.1.1 11020 Via 172.34.34.3, 00:33:21, Ethernet06.0.0.032 Is Subnetted, 1 SubnetsO E2 6.1.1.1 11020 Via 172.34.34.3, 00:33:21, Ethernet0172.12.0.016 Is Variably Subnetted, 2 Subnets, 2 MasksO E2 172.12.21.030 11020 Via 172.34.34.3, 00:33:32, Ethernet0O E2 7.1.1.1 11020 Via 172.34.34.3, 00:33:21, Ethernet015.0.0.024 Is Subnetted, 1 SubnetsO E2 15.1.1.0 11020 Via 172.34.34.3, 00:33:32, Ethernet0To Redistribute Routes Into OSPF And Mark Them As E1 Upon Redistribution, Use The Metric-type Option With The Redistribution Command.R1(config)router Ospf 1R1(config-router)redistribute Rip Subnets Metric-type ?1 Set OSPF External Type 1 Metrics2 Set OSPF External Type 2 MetricsR1(config-router)redistribute Rip Subnets Metric-type 1Look At The Same Two Routes In R4's Routing Table, Which Are Now Displayed As E1 Routes:O E1 5.1.1.1 11094 Via 172.34.34.3, 00:04:13, Ethernet06.0.0.032 Is Subnetted, 1 SubnetsO E1 6.1.1.1 11094 Via 172.34.34.3, 00:04:14, Ethernet0BSCI Exam Success And Earning Your CCNP Certification Depends On Knowing The Details, And There Are Plenty Of Details Involved In OSPF Route Redistribution! Keep Studying, Practice Different Scenarios In Your CCNA CCNP Home Lab Or Rack Rental, And You'll Master These Details And Pass The Exam!
