Cisco CCNP BSCI Certification Troubleshooting Route Redistribution Part I
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Cisco CCNP/BSCI Certification: Troubleshooting Route Redistribution - Part I
Overview
Route redistribution might seem straightforward, but mastering its intricacies is crucial for passing the CCNP exams and becoming an expert networker. In this guide, Chris Bryant, CCIE
12933, demonstrates how to troubleshoot a common redistribution error.
Key Concepts
- Keywords: CCNP, BSCI, exam, certification, route redistribution, OSPF, RIP, BGPUnderstanding Route Redistribution
Route redistribution can lead to complications if not properly managed. Beyond routing loops and suboptimal paths, even minor command misconfigurations can result in incomplete IP connectivity despite a seemingly correct routing table.
Common Errors in Route Redistribution
This tutorial explores three frequent route redistribution errors and their solutions using three routers: R1, R3, and R5. R1 and R5 operate within a RIPv2 domain; R1 and R3 in an OSPF domain. R1 handles two-way route redistribution.
R5 advertises its loopback, 5.5.5.5/24, in the RIPv2 domain. R1 displays the route in its RIP table:
```plaintext
R1
show ip route rip
5.0.0.0/24 is subnetted, 1 subnetR 5.5.5.0 [120/1] via 100.1.1.5, 00:00:01, Ethernet0
```
For R3 to recognize the route, enable redistribution on R1 with:
```plaintext
R1(config)
router ospf 1
R1(config-router)redistribute rip
```However, you'll see:
```plaintext
% Only classful networks will be redistributed
```
This message indicates that only classful networks can be redistributed. R3 will not display any output:
```plaintext
R3
show ip route ospf
< no output >```
The Classful vs. Classless Dilemma
R5 also advertises a classful network, 16.0.0.0/8. R1 perceives this as classful:
```plaintext
R1
show ip route rip
R 16.0.0.0/8 [120/1] via 100.1.1.5, 00:00:00, Ethernet0```
R3 successfully receives this classful route:
```plaintext
R3
show ip route ospf
O E2 16.0.0.0/8 [110/20] via 172.12.123.1, 00:00:08, Serial0.31```
To redistribute both types, modify R1’s configuration:
```plaintext
R1(config)
router ospf 1
R1(config-router)no redistribute rip
R1(config-router)redistribute rip subnets
```R3 now identifies both classful and classless routes:
```plaintext
R3
show ip route ospf
O E2 16.0.0.0/8 [110/20] via 172.12.123.1, 00:00:20, Serial0.31100.0.0.0/24 is subnetted, 1 subnet
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 subnet
O E2 5.5.5.0 [110/20] via 172.12.123.1, 00:00:20, Serial0.31
```
Conclusion
This error in route redistribution is common, but now you know how to resolve it! Stay tuned for more tips in the next part of our CCNP/BSCI tutorial series.
You can find the original non-AI version of this article here: Cisco CCNP BSCI Certification Troubleshooting Route Redistribution Part I.
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