If there's digit CCNP / BSCI matter that looks so cushy but crapper advance to a actual headache, it's line redistribution. I'm not modify conversation most the routing loops and suboptimal routing that crapper termination when line redistribution is finished without comely thinking - I'm conversation most the base commands themselves. Leaving discover digit azygos bidding option, or forgetting what additional needs to be redistributed when redistributing dynamically unconcealed routes, crapper yield you with a routing plateau that looks rank but does not termination in flooded IP connectivity.
In this liberated CCNP / BSCI tutorial series, we'll verify a countenance at threesome ordinary errors in line redistribution configurations, and how to mend them. We'll ingest threesome routers, R1, R3, and R5. R1 and R5 are in a RIPv2 field and R1 and R3 are in an OSPF domain. R1 module be performing two-way line redistribution.
R5 is business its loopback, 5.5.5.5/24, into the RIPv2 domain. R1 sees this line in its RIP routing table:
R1#show ip line rip
5.0.0.0/24 is subnetted, 1 subnets
R 5.5.5.0 [120/1 via 100.1.1.5, 00:00:01, Ethernet0
For R3 to wager this route, line redistribution staleness be organized on R1. We'll ingest the redistribute countercurrent bidding to do so.
R1(config)#router ospf 1
R1(config-router)#redistribute rip
% Only classful networks module be redistributed
The router directly gives us a communication that only classful networks module be redistributed. What does this mean? Let's go to R3 and wager if that router is receiving this route.
R3#show ip line ospf
< no production >
When we intend no termination from a exhibit command, that effectuation there's null to show. The exclusive routes that module be successfully redistributed with the underway plan on R1 are classful networks, and 5.5.5.0/24 is a subnet.
To boost elaborate the point, a classful meshwork has been additional to R5. This meshwork is 16.0.0.0 /8, and is today existence advertised by RIP. R1 sees this meshwork as classful...
R1#show ip line rip
R 16.0.0.0/8 [120/1 via 100.1.1.5, 00:00:00, Ethernet0
5.0.0.0/24 is subnetted, 1 subnets
R 5.5.5.0 [120/1 via 100.1.1.5, 00:00:00, Ethernet0
... and R3 is receiving the line finished redistribution.
R3#show ip line ospf
O E2 16.0.0.0/8 [110/20 via 172.12.123.1, 00:00:08, Serial0.31
To redistribute both classful and democratic networks, the choice subnets staleness be additional to the redistribute bidding on R1.
R1(config)#router ospf 1
R1(config-router)#no redistribute rip
R1(config-router)#redistribute countercurrent subnets
R3 module today wager both the classful and democratic networks existence redistributed into OSPF. (100.1.1.0 is the meshwork conjunctive R1 and R5.)
R3#show ip line ospf
O E2 16.0.0.0/8 [110/20 via 172.12.123.1, 00:00:20, Serial0.31
100.0.0.0/24 is subnetted, 1 subnets
O E2 100.1.1.0 [110/20 via 172.12.123.1, 00:00:20, Serial0.31
5.0.0.0/24 is subnetted, 1 subnets
O E2 5.5.5.0 [110/20 via 172.12.123.1, 00:00:20, Serial0.31
This is digit of the most ordinary errors prefabricated during line redistribution, but today you undergo what to countenance discover for! In the incoming conception of this liberated CCNP / BSCI tutorial, we'll verify a countenance at added much error.
Chris Bryant, CCIE #12933, is the someone of The Bryant Advantage, bag of liberated CCNP and CCNA tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
For a FREE double of his stylish e-books, How To Pass The CCNA and How To Pass The CCNP, meet meet the website! You crapper also intend FREE CCNA and CCNP communicating questions every day! Pass the CCNP communicating with The Bryant Advantage!
