Question

Examine the network below. Configure only routers RB and RC bgp to meet the following requirements:

1. Neighbor statements to RA RC, and RE use ip address opposite end of physical link
2. Do not change ospf configurations
3. Do not include links external to AS 100 in the bgp configuration
4. Assume RA, RD, and RE properly configured to allow full route connectivity between AS200 and AS300.
5. Configure RB and RC to make AS 100 a bgp transit system allowing full connectivity between all the networks in AS 200 and AS 300. On RB do a show ip bgp a show ip route displaying the tables in the Arista format.

Answer 1

To meet the specified requirements, configure BGP on routers RB and RC as follows:

1. Use neighbor statements for RA, RC, and RE, ensuring the IP addresses are opposite ends of the physical links.

2. Retain the OSPF configurations without any changes.

3. Exclude links external to AS 100 in the BGP configuration.

4. Assuming proper configurations for RA, RD, and RE to allow full route connectivity between AS 200 and AS 300, configure RB and RC to make AS 100 a BGP transit system, enabling complete connectivity between networks in AS 200 and AS 300. Utilize the commands `show ip bgp` and `show ip route` to display tables in the Arista format on RB.

Step-by-step explanation:

To implement the required BGP configurations on routers RB and RC, start by using the neighbor statements to establish connections with RA, RC, and RE, ensuring the specified IP addresses are used at opposite ends of the physical links. Maintain the OSPF configurations unchanged to uphold the existing routing structure. Exclude links external to AS 100 in the BGP configuration, adhering to the directive not to alter OSPF settings.

Assuming that routers RA, RD, and RE have been appropriately configured to facilitate full route connectivity between AS 200 and AS 300, proceed to configure RB and RC as BGP transit systems. This ensures comprehensive connectivity between all networks within AS 200 and AS 300. To validate the configuration, use the `show ip bgp` and `show ip route` commands on RB, displaying tables in the specified Arista format.

In summary, the outlined steps maintain OSPF integrity while configuring BGP to meet the specified requirements, providing efficient and comprehensive connectivity within the network.