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]
Abdullah Medhat
Abdullah Medhat, CCIE#64416, is a co-founder at Recursive-Lookup, with over 10 years of experience in Service Provider networks. Always hungry for knowledge and learning new technologies.
Abullah, we need more clear topology pic, as the existing one is so small to recognize the IPs and the Names…
Thanks,
For Simplicity we can use one of the existing PEs(1–>4) as a route reflector instead of using full mesh feature.
BR,
Dear Galaa, for simplicity we can use a lot of other ways, but Abdullah designed this lab to implement regular BGP peers over OSPF (we can use EIGRP, ISIS, Static…etc)