Learning by Doing: CISCO Certified Network ... - SCN Research

Background:
BGP is primarily used between ISP’s for routing. In other words, it “is” the Internet.
Right now there are about 100,000 BGP routes in the Internet. Unlike RIP, IGRP, or
EIGRP you wouldn’t want to use BGP in a small network. Save this routing protocol for
the huge corporations and Internet Service Providers. Some people think it is a very
difficult protocol to configure and maintain while others think it is “a piece of cake…as
long as you know what you are doing.” We are only going to touch on the real basics
here. BGP is a very involved protocol and worthy of an entire course at the CCNP level
at the least. Routers using BGP only exchange full routing tables when the connection is
first established. After that there are no periodic updates, only when a change occurs.
And then only the optimal route is broadcast not the entire table.
Step-By-Step Instructions:
1. Set up and cable the lab as shown. Put all the basics on the routers except for the
routing protocols.
2. Between Cult and Deadcow enable EIGRP with an autonomous system number of
13.
cult(config)#router eigrp 13
cult(config-router)#network 192.168.1.0
cult(config-router)#network 192.168.2.0
deadcow(config)#router eigrp 13
deadcow(config-router)#network 192.168.2.0
deadcow(config-router)#network 192.168.3.0
Test those routes between cult and deadcow. Now let’s move on to BGP.
cult#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR
Gateway of last resort is not set
C 192.168.1.0/24 is directly connected, Ethernet0/0
C 210.1.1.0/24 is directly connected, Serial0/1
C 192.168.2.0/24 is directly connected, Serial0/0
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