In this lab we will be covering BGP features as Regular Expressions, AS-Path Filtering, AS-Path Perpending and Communities.

 

Tasks:

1- Configure OSPF as an IGP inside AS 80 as following:
– PE1 and PE5 in OSPF Area 0, PE2 in OSPF Area 2, PE3 in OSPF Area 3 and PE4 in OSPF Area 4

2- Configure full mesh IBGP between PE1, PE2, PE3 and PE4. PE5 wont be running BGP.

3- Clarify the reason behind Loopback IBGP routes not entering the Global IP Routing Table and that OSPF routes are the ones preferred.

4- Configure EBGP between PE1 – ISP1 and PE2 – ISP2 using directly connected Serial Interfaces. Advertise loopbacks of ISP1 & ISP2.

5- Configure EBGP between PE3 — CE1 and PE4 — CE2 using directly connected Serial Interfaces. Advertise loopbacks of CE1 & CE2

6- Configure EBGP between ISP1 & ISP2

7- Advertise default routes only to both CE1 & CE2.

8- Set ISP2 to be Up-Stream for AS 80 and Set ISP1 to be Down-Stream for AS 80.

 

Verification:

– Initiate Traceroute command from inside AS 60, AS70, AS 100 and AS 200 to insure that the Up-Stream and Down-Stream are correctly configured.

– Verify that you can ping all loopbacks inside AS80 except PE5, if not, Clarify why then solve the issue.

– On CE1 and CE2 verify that you receive only a default route from the opposing PE router.

 

Connections:

 

HTH .. Enjoy !!

[box type=”note”]Check BGP LAB 1[/box]