To pass your BSCI exam and earn your CCNP certification, you've got to master route summarization. When you get to the BSCI level, actually breaking the routes down into binary strings and performing summarization is second nature to you. (If it isn't, get some more practice!) What makes CCNP / BSCI route summarization more difficult is just keeping the different protocol summarization commands straight!
Laptop Battery RIP and EIGRP both perform route summarization at the interface level with the ip summary-address command. In the following example, R2 is running RIP and was sending four routes to R3, R3's table looked like this before summarization:
Passing the BCSI exam and earning your CCNP certification requires you to know OSPF stub areas inside and out. Stub areas, total stub areas, stub stub areas ... and pretty soon your head is swimming. Then when you hear that EIGRP offers stub routing, your first reaction may be unprintable! But while EIGRP stub routing is effective in the right situation, it's not as complex as OSPF stub routing. Let's take a look at basic EIGRP stub routing.
Thinkpad R3#show ip route rip
Configuring EIGRP stub routers also combats the SIA problem. EIGRP stub routers are not queried for routes when the hub does not have a feasible successor for a successor route that has gone down. By default, directly connected networks and summary routes. To change this default, use the eigrp stub command followed by the types of routes you want the stub to advertise back to the hub. (The eigrp stub command run by itself configures the router as stub.)
Microsoft 172.16.0.0/24 is subnetted, 4 subnets
Occasionally, during your CCNA and CCNP studies, you'll run into a term that just doesn't quite make sense to you. (Okay, more than occasionally!) One such term is "reverse telnet". As a Cisco certification candidate, you know that telnet is simply a protocol that allows you to remotely connect to a networking device such as a router or switch. But what is "reverse telnet", CCNP home lab setup
Laptop Computers R 172.16.8.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
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Laptop Computer R 172.16.9.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
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Desktop Computer R 172.16.10.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
Notebooks R 172.16.11.0 [120/1] via 172.23.23.2, 00:00:02, Ethernet0
Lenovo By summarizing the routes and using the ip summary-address command, RIP advertises only the summary route to the downstream neighbor.
Hard Drive R2(config)#int ethernet0
Travelstar R2(config-if)#ip summary-address rip 172.16.8.0 255.255.252.0
Gateway R3#clear ip route *
Laptop Parts R3#show ip route rip
Software 172.16.0.0/22 is subnetted, 1 subnets
Hard Drives R 172.16.8.0 [120/1] via 172.23.23.2, 00:01:24, Ethernet0
Electronics EIGRP works much the same way, except that the EIGRP AS number must be named in the ip summary-address command.
Canon In the following example, R2 was advertising four separate routes to R3 via 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. What summary route can be used here?
Desktop Pc The summary is 100.0.0.0 252.0.0.0. To send that route to downstream routers, configure the following on R2:
Desktop Computers R2(config)#interface ethernet0
Think Pad R2(config-if)#ip summary-address eigrp 100 100.0.0.0 252.0.0.0
Repair R3 will then have only one route in its EIGRP table - the summary route.
Data Recovery R3#show ip route eigrp
Cisco D 100.0.0.0/6 [90/2297856] via 172.23.23.2, 00:02:33, Ethernet0
Keyboard By mastering basic binary skills and keeping in mind that RIP and EIGRP perform route summarization at the interface level, you're one step closer to passing your BSCI exam and earning your CCNP certification!
Monitor In the next part of this tutorial, we'll take a detailed look at the different methods OSPF uses for route summarization.
Desktop
Infosys Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (http://www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, Ultimate CCNP Study Packages, and CCNA CBT video training. Pass the CCNA exam ,BSCI exam , and BCMSN exam with Chris Bryant, CCIE #12933!
For a copy of his FREE "How To Pass The CCNA" or "How To Pass The CCNP" ebook and receive a FREE CCNA and CCNP question every day, just visit the website and claim your free copies!
