Cisco Router IOS XR Manuale Utente Scaricare il pdf (Pagina 82)

Cisco IOS XR Training Page 82

Now for the interface facing the PE (here f0/0)

CE1(config-if)#int f0/0

CE1(config-if)#ip add 10.1.13.3 255.255.255.0

CE1(config-if)#no shut

CE1(config-if)#^Z

CE1#

Ok, now lets get CE2 done since it basically the same – but here we will use

10.4.4.4/32 and 10.4.24.4/24

CE2#conf t

Enter configuration commands, one per line. End with CNTL/Z.

First up, Loopback 0. Since this is IOS, you will need to use the full dotted

decimal subnet mask

CE2(config)#int loop0

CE2(config-if)#ip add 10.3.4.4 255.255.255.255

Now for the interface facing the PE (here f0/0)

CE2(config-if)#int f0/0

CE2(config-if)#ip add 10.1.24.4 255.255.255.0

CE2(config-if)#no shut

CE2(config-if)#^Z

CE2#

Now we can do the OSPF configs for these routers. Since this is a lab, I am

just going to put the 10/8 network in Area 0. So, first up - CE1

CE1(config)#router ospf 1

CE1(config-router)#net 10.0.0.0 0.255.255.255 a 0

CE1(config-router)#

And now CE2:

CE2(config)# router ospf 1

CE2(config-router)#net 10.0.0.0 0.255.255.255 a 0

CE2(config-router)#

Easy part done, now to build the PE nework.

For the PE network we are going to use ISIS for our internal routing protocol

and then use BGP on top of that to connect the routers together to pass the

VPNv4 routes. Why ISIS you ask? It is because you can use one process for

IPv4 and IPv6 traffic. With OSPF you need to run two processes, OSPF for

IPv4 and OSPFv3 for IPv6. A single process makes it easier to support as

well as if new protocols come around, ISIS won’t really care since it is not

IP based (CLNS based).

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Cisco Router IOS XR Manuale Utente Pagina 82