Lab Objective:
The focus of this lab is to understand BGP implementation and configuration in Cisco IOS routers. Additional technologies tested include route reflection and path control.
Lab Topology:
The lab network topology is illustrated below:
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IMPORTANT NOTE If you are using the www.howtonetwork.net racks, please bring up the LAN interfaces connected to the routers by issuing the no shutdown command on the connected switches. If you are using a home lab with no interface fastethernet 0/0 Alternately, you can simply connect the interfaces to a hub or switch if you have one available in your own lab. |
Task 1
Configure hostnames and IP addressing on all routers as illustrated in the network topology.
Task 2
Configure the following Loopback 0 interfaces on all routers:
R1 – Loopback 0: IP Address 1.1.1.1/32
R2 – Loopback 0: IP Address 2.2.2.2/32
R3 – Loopback 0: IP Address 3.3.3.3/32
R4 – Loopback 0: IP Address 4.4.4.4/32
Next, configure EIGRP, using AS 254, on all routers and enable EIGRP for all interfaces EXCEPT for the 150.x.x.x/24 LAN subnets connected to R1, R2, R3, and R4. Verify your configuration.
Task 3
Configure internal BGP on R1, R2, R3, and R4 shown below. Use peer-group configuration on R2 and R4 but NOT on R1 and R3:
- All routers should use their Loopback 0 interface addresses as their router IDs
- All routers should peer using their Loopback 0 interface addresses
- R1 and R3 should be configured as Route Reflectors
- R2 should peer with R1 and R3
- R4 should peer with R1 and R3
- R1 and R3 belong to the same cluster to reduce the size of the RIB
- All routers should use TCP MD5 authentication with a password of ‘CCNP’
- BGP Hellos should be sent every 5 seconds and the Hold Time should be set to 15 seconds
Verify your configuration using the appropriate commands.
Task 4
Advertise the 150.x.x.x/24 subnets on all routers via BGP. These prefixes should be redistributed into BGP on every router. In the future, there will be external BGP connections to one or more ISPs. Management has decided that the 150.x.x.x/24 subnets should never be advertised to these ISPs. Ensure that these prefixes are NEVER advertised out of AS 254. You are NOT allowed to use prefix lists or any type of filters. Verify your configuration using the appropriate commands. Verify that each router can also ping every other routers’ 150.x.x.x/24 LAN subnet.
Task 5
Ensure that R2 and R4 always prefer routes received from R3 to those received from R1 for each others’ 150.x.x.x/24 prefixes. You are only allowed to configure ONE router. Your solution should be globally significant; however, you are NOT allowed to modify any of the BGP default administrative distance values. You can modify BGP attributes as you see fit. Verify the configuration using the appropriate commands.