Cisco CCNP BSCI Tutorial Route Summarization With RIP And EIGRP
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Cisco CCNP BSCI Tutorial: Route Summarization with RIP and EIGRP
Introduction
Route summarization is a crucial skill for passing the BSCI exam and earning your CCNP certification. Understanding how summarization works with RIP and EIGRP is essential. Here's a detailed guide by Chris Bryant, CCIE
12933, on mastering this topic.
Route Summarization with RIP
Both RIP and EIGRP handle route summarization using the `ip summary-address` command at the interface level. Let's explore how this works with RIP.
Example: Before Summarization
Consider R2 running RIP and sending four routes to R3. R3’s routing table looks like this before summarization:
```
R3
show ip route rip
172.16.0.0/24 is subnetted, 4 subnets
R 172.16.8.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
R 172.16.9.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
R 172.16.10.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
R 172.16.11.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
```
Summarization Process
To summarize these routes, execute:
```
R2(config)
int ethernet0
R2(config-if)ip summary-address rip 172.16.8.0 255.255.252.0
```Clear the routing table on R3:
```
R3
clear ip route *
```Now, R3’s routing table will display a single summary route:
```
R3
show ip route rip
172.16.0.0/22 is subnetted, 1 subnets
R 172.16.8.0 [120/1] via 172.23.23.2, 00:01:24, Ethernet0
```
Route Summarization with EIGRP
EIGRP summarization is similar, but it requires you to specify the EIGRP AS number.
Example: EIGRP Summarization
Suppose R2 advertises four routes to R3 using EIGRP 100: 100.0.0.0, 101.0.0.0, 102.0.0.0, and 103.0.0.0, all with an eight-bit mask. The summary route would be 100.0.0.0 with a 252.0.0.0 mask. Configure it as follows:
```
R2(config)
interface ethernet0
R2(config-if)ip summary-address eigrp 100 100.0.0.0 252.0.0.0
```R3’s EIGRP table will now display:
```
R3
show ip route eigrp
D 100.0.0.0/6 [90/2297856] via 172.23.23.2, 00:02:33, Ethernet0
```
Conclusion
By mastering basic binary skills and remembering that both RIP and EIGRP perform summarization at the interface level, you’re well on your way to passing the BSCI exam and earning your CCNP certification.
In the next installment, we’ll delve into how OSPF implements route summarization.
You can find the original non-AI version of this article here: Cisco CCNP BSCI Tutorial Route Summarization With RIP And EIGRP.
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