So I just got done building the lab topology for my for MPLS studies. The lab network will look like this…
So I decided to stick with just two customers at this point. I think it will be enough to get the entire MPLS point across but not too many to confuse the points. I’m fortunate enough to be building the lab on actual hardware however, there were a couple of limitations I had to get around. All of the routers being used only have two physical interfaces. That being said, I came up with a layout that used router sub-interfaces and a standard layer 2 switch with VLANs to connect them all together. You’ll notice as I do the router configurations that I’m using sub-interfaces, but the rest should be pretty standard.
I’m considering the provider network here to be any ‘P’ (Provider) or ‘PE’ (Provider Edge) routers. The initial build will be configuring IP addresses and setting up OSPF as the routing protocol between all 7 routers. That being said, there shouldn’t be anything here that’s new to anyone. The end goal here is to just have a full mesh of P and PE routers. In the next post, we’ll configure MPLS.
P1
hostname P1
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
interface FastEthernet0/0.1
description VLAN 1 Sub interface
encapsulation dot1Q 1
ip address 172.172.172.2 255.255.255.252
interface FastEthernet0/0.2
description VLAN 2 Sub interface
encapsulation dot1Q 2
ip address 172.172.172.6 255.255.255.252
interface FastEthernet0/0.5
description VLAN 5 Sub interface
encapsulation dot1Q 5
ip address 172.172.172.17 255.255.255.252
interface FastEthernet0/0.6
description VLAN 6 Sub interface
encapsulation dot1Q 6
ip address 172.172.172.21 255.255.255.252
int l0
ip address 2.2.2.2 255.255.255.255
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
network 2.2.2.2 0.0.0.0 area 0
network 172.172.172.2 0.0.0.0 area 0
network 172.172.172.6 0.0.0.0 area 0
network 172.172.172.17 0.0.0.0 area 0
network 172.172.172.21 0.0.0.0 area 0
enable secret cisco
P2
hostname P2
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
interface FastEthernet0/0.4
description VLAN 4 Sub interface
encapsulation dot1Q 4
ip address 172.172.172.13 255.255.255.252
interface FastEthernet0/0.6
description VLAN 6 Sub interface
encapsulation dot1Q 6
ip address 172.172.172.22 255.255.255.252
interface FastEthernet0/0.7
description VLAN 7 Sub interface
encapsulation dot1Q 7
ip address 172.172.172.25 255.255.255.252
interface FastEthernet0/0.9
description VLAN 9 Sub interface
encapsulation dot1Q 9
ip address 172.172.172.33 255.255.255.252
interface FastEthernet0/0.11
description VLAN 11 Sub interface
encapsulation dot1Q 11
ip address 172.172.172.42 255.255.255.252
int l0
ip address 5.5.5.5 255.255.255.255
router ospf 1
log-adjacency-changes
router-id 5.5.5.5
network 5.5.5.5 0.0.0.0 area 0
network 172.172.172.13 0.0.0.0 area 0
network 172.172.172.22 0.0.0.0 area 0
network 172.172.172.25 0.0.0.0 area 0
network 172.172.172.33 0.0.0.0 area 0
network 172.172.172.42 0.0.0.0 area 0
enable secret cisco
P3
hostname P3
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
!
interface FastEthernet0/0.8
description VLAN 8 Sub interface
encapsulation dot1Q 8
ip address 172.172.172.30 255.255.255.252
interface FastEthernet0/0.9
description VLAN 9 Sub interface
encapsulation dot1Q 9
ip address 172.172.172.34 255.255.255.252
interface FastEthernet0/0.10
description VLAN 10 Sub interface
encapsulation dot1Q 10
ip address 172.172.172.38 255.255.255.252
int l0
ip address 6.6.6.6 255.255.255.255
router ospf 1
log-adjacency-changes
router-id 6.6.6.6
network 6.6.6.6 0.0.0.0 area 0
network 172.172.172.30 0.0.0.0 area 0
network 172.172.172.34 0.0.0.0 area 0
network 172.172.172.38 0.0.0.0 area 0
enable secret cisco
P4
hostname P4
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
interface FastEthernet0/0.3
description VLAN 3 Sub interface
encapsulation dot1Q 3
ip address 172.172.172.10 255.255.255.252
interface FastEthernet0/0.5
description VLAN 5 Sub interface
encapsulation dot1Q 5
ip address 172.172.172.18 255.255.255.252
interface FastEthernet0/0.7
description VLAN 7 Sub interface
encapsulation dot1Q 7
ip address 172.172.172.26 255.255.255.252
interface FastEthernet0/0.8
description VLAN 8 Sub interface
encapsulation dot1Q 8
ip address 172.172.172.29 255.255.255.252
int l0
ip address 4.4.4.4 255.255.255.255
router ospf 1
log-adjacency-changes
router-id 4.4.4.4
network 4.4.4.4 0.0.0.0 area 0
network 172.172.172.10 0.0.0.0 area 0
network 172.172.172.18 0.0.0.0 area 0
network 172.172.172.26 0.0.0.0 area 0
network 172.172.172.29 0.0.0.0 area 0
enable secret cisco
PE1
hostname PE1
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
interface FastEthernet0/0.1
description VLAN 1 Sub interface
encapsulation dot1Q 1
ip address 172.172.172.1 255.255.255.252
interface FastEthernet0/0.3
description VLAN 3 Sub interface
encapsulation dot1Q 3
ip address 172.172.172.9 255.255.255.252
int l0
ip address 1.1.1.1 255.255.255.255
router ospf 1
log-adjacency-changes
router-id 1.1.1.1
network 1.1.1.1 0.0.0.0 area 0
network 172.172.172.1 0.0.0.0 area 0
network 172.172.172.9 0.0.0.0 area 0
enable secret cisco
PE2
hostname PE2
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
!
interface FastEthernet0/0.2
description VLAN 2 Sub interface
encapsulation dot1Q 2
ip address 172.172.172.5 255.255.255.252
interface FastEthernet0/0.4
description VLAN 4 Sub interface
encapsulation dot1Q 4
ip address 172.172.172.14 255.255.255.252
int l0
ip address 3.3.3.3 255.255.255.255
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
network 3.3.3.3 0.0.0.0 area 0
network 172.172.172.5 0.0.0.0 area 0
network 172.172.172.14 0.0.0.0 area 0
enable secret cisco
PE3
hostname PE3
ip routing
ip cef
no ip domain-lookup
line vty 0 15
password cisco
login
interface FastEthernet0/0
no ip address
duplex auto
speed auto
no shut
!
interface FastEthernet0/0.10
description VLAN 10 Sub interface
encapsulation dot1Q 10
ip address 172.172.172.37 255.255.255.252
interface FastEthernet0/0.11
description VLAN 11 Sub interface
encapsulation dot1Q 11
ip address 172.172.172.41 255.255.255.252
int l0
ip address 7.7.7.7 255.255.255.255
router ospf 1
log-adjacency-changes
router-id 7.7.7.7
network 7.7.7.7 0.0.0.0 area 0
network 172.172.172.37 0.0.0.0 area 0
network 172.172.172.41 0.0.0.0 area 0
enable secret cisco
Wrap Up
So at this point we should have all of P and PE routers talking OSPF to each other. you should have full reachability of all of the loopback 0 interfaces between all 7 routers. Next post, we’ll configure some MPLS.
what routing configuration we need on customer edge routers??
is it the same as on the providers edge???