تمرین BGP

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R1 has an EBGP peer to R5 and an IBGP peer to R2.
R2 has an EBGP peer to R4 and IBGP peer to R1.

Ensure that the 15 loopbacks on R1 (131.108.2.0–131.108.16.0/24) are advertised to R5 and that R5 modifies all even networks with a local weight to 1000 and metric (MED) to 100. For all odd networks, set the weight to 2000 and the metric (MED) to 200.

Ensure that R1 advertises a default route to R5 and that R2 advertises a default route to R4. Use a prefix list to accomplish this task.

Ensure that R4 does not accept any networks in the range 131.108.0.0 but does accept a default route only. All other networks must be denied on R4.

Ensure that R3 can reach all BGP-advertised networks using OSPF as the only routing protocol. (That is, redistribution is required on R1/R2).

BGP Dual-Homing

In this scenario, you build upon the IBGP network  and configure EBGP on R1 and R2 and simulate a dual-homing ISP connection. Because most CCNP candidates do not have two ISP connections to configure in a lab environment, you configure two routers and inject default routes along with a large IP routing table to simulate an ISP router.

Configure the routers ISP1 and ISP2 for EBGP and advertise a default route to the internal BGP network along with some routes that simulate an Internet environment.configures ISP1(R6) for EBGP and allows a default route to be advertised to the EBGP peer to R1.

eBGP

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امروز یک سناریو دیگه رو آماده کردم

شرح سناریو

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You will notice that all the IP addressing schemes are /24, except for the serial link between R1 and R2. The serial link contains a mask, 255.255.255.252 or /30. BGP has no issues with VLSM. The 16 loopbacks on R1 are advertised to R2 using the redistribute connected command. The no-auto summary command ensures that R2 sees all 16 individual routes. The access list on R2 must be set with a mask of 0.0.254.255, or all even networks match these criteria. The dual-path connections between R1 and R2 allow redundancy. There are two EBGP sessions between R1 and R2; therefore, the route map on R2 is applied to both EBGP peers in case of link failure.

شکل شبیه سازی شده سناریوی

سناریو BGP

All routers have a loopback 0 interface X.X.X.X/32 where X is the number of the router.
Configure OSPF on R1, R2, R3 and advertise 10.10.12.0/24, 10.10.13.0/24 and loopback 0 subnets
Configure OSPF on R4, R5 and advertise 150.45.45.0/26 and loopback 0 subnets
Configure full iBGP mesh in AS 123, use loopback 0 interface for peering
Configure iBGP in AS 45, use loopback 0 interface for peering
Configure eBGP between AS 123 and AS 45
Advertise R1 loopback 0 and 150.45.45.0/26 in BGP
Ensure AS 123 will use the link between R3-R5 towards network 150.45.45.0/26. Use MED attribute only.
Ensure AS 45 will use the link between R3-R5 towards network 1.1.1.1/32. Use MED attribute only.