Cisco CCNP / BSCI Certification: Troubleshooting Route Redistribution, Part I

If there is one CCNP / BSCI topic that looks so easy, but could lead to a real headache, it is the path of redistribution. I am not even talking about the routing loops and suboptimal routing that can result when route redistribution is done without proper planning - I am talking about the basic commands themselves. Withdrawal from one team option, or forgetting that there should be reallocated when the redeployment dynamically discovered routes, can leave you with a routing table that looks complete, but does not lead to full IP connection.
In is free CCNP / BSCI tutorial series, we look at three common errors in the way of redistribution configurations, and how to fix them. We will use three routers, R1, R3, and R5. R1 and R5 are in RIPv2 domain and R1 and R3 are in the OSPF domain. R1 will serve a two-way route redistribution.
R5 advertising is its hinges, 5.5.5.5/24, in RIPv2 domain. R1 sees this route in the routing table RIP:
R1 show ip route rip
5.0.0.0/24 is subnetted, 1 subnets
R 5.5.5.0 [120 / 1] through 100.1.1.5, 00:00:01, Ethernet0
For R3 would have preferred this path, the path of redistribution must be configured to R1. We will use the redistribution rip command to do so.
R1 (config) 1 router ospf
R1 (configuring the router) redeploy rip
% Only classful networks will be immediately redeployed
The router enables us to understand that only " classful networks will be redistributed & quot;. What does this mean? Let us go back to R3 and see that the router receives this route.
R3 show ip ospf
When route, we did not get a result to show team, it means that there& 39;s nothing to show. The only routes that have been successfully transferred to the current configuration at R1 are classful networks, and 5.5.5.0/24 is the subnet.
To further illustrate the point, a classful network has been added to R5. This network 16.0.0.0 / 8, and is now advertised RIP. R1 sees this network, as a classful ...
R1 show ip route rip
R 16.0.0.0 / 8 [120 / 1] through 100.1.1.5, 00:00:00, Ethernet0
5.0.0.0/24 is subnetted, 1 subnets
R 5.5.5.0 [120 / 1] through 100.1.1.5, 00:00:00, Ethernet0
... and R3 receives route through redistribution.
R3 route show ip ospf
O E2 16.0.0.0 / 8 [110/20] through 172.12.123.1, 00:00:08, Serial0.31
To redeploy so classful and classless network option " subnets & quot; should be added to the team to transfer R1.
R1 (config) 1 router ospf
R1 (configuring the router) or redistribute rip
R1 (configuring the router) redeploy rip subnets
R3 classful and see how classless networks, which are redistributed to OSPF. (100.1.1.0 is a network of R1 and R5.)
R3 route show ip ospf
O E2 16.0.0.0 / 8 [110/20] through 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] through 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 ] through 172.12.123.1, 00:00:20, Serial0.31
This is one of the most common mistakes made in the route redistribution, but now you know that look! In the next part of this free CCNP / BSCI tutorial, we take a look at another such errors. elizabet tena



Bookmark it: