The next posts will be about MPLS and how to set up the network which you can see below in the network-diagram. In this post I will set up the core part of the network. In the next post I will show how to configure VRF’s, how to confiugure PE to CE routing, management VPN’s, central services VPN’s etc.
If you want to set up this network in GNS3 you can download the GNS3 file here
Below are the configurations for router R3, R1, R5 and R6.
In this network routers R3 and R6 are PE routers and routers R1 and R5 are P routers. First off I will show the configurations of the P routers because they are the most simple. Basically what you need to configure on the P routers :
ip cef
!
mpls ip
!
int (core-link interface)
mpls ip
R1 :
hostname R1
!
ip cef
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address 15.15.15.1 255.255.255.0
duplex auto
speed auto
mpls ip
!
interface FastEthernet1/0
ip address 13.13.13.1 255.255.255.0
duplex auto
speed auto
mpls ip
!
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
network 1.1.1.1 0.0.0.0 area 0
network 13.13.13.1 0.0.0.0 area 0
network 15.15.15.1 0.0.0.0 area 0
R5 :
hostname R5
!
ip cef
!
interface Loopback0
ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
ip address 15.15.15.5 255.255.255.0
duplex auto
speed auto
mpls ip
!
interface FastEthernet1/0
ip address 56.56.56.5 255.255.255.0
duplex auto
speed auto
mpls ip
!
router ospf 1
router-id 5.5.5.5
log-adjacency-changes
network 5.5.5.5 0.0.0.0 area 0
network 15.15.15.5 0.0.0.0 area 0
network 56.56.56.5 0.0.0.0 area 0
Next we will configure the PE routers R3 and R6, basically what you need to configure on the PE routers is :
ip cef
!
ip bgp-community new-format
!
mpls ip
!
interface (core-link interface)
mpls ip
!
router bgp (AS nr)
neighbor (remote PE ip address) remote-as (AS nr)
neighbor (remote PE ip address) upd lo 0
!
address-family vpnv4
neighbor (remote PE ip address) activate
neighbor (remote PE ip address) send-comm both
R3 :
hostname R3
!
ip cef
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet1/0
ip address 13.13.13.3 255.255.255.0
duplex auto
speed auto
mpls ip
!
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
network 3.3.3.3 0.0.0.0 area 0
network 13.13.13.3 0.0.0.0 area 0
!
router bgp 100
no synchronization
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor 6.6.6.6 remote-as 100
neighbor 6.6.6.6 update-source Loopback0
no auto-summary
!
address-family vpnv4
neighbor 6.6.6.6 activate
neighbor 6.6.6.6 send-community both
exit-address-family
!
ip bgp-community new-format
R6 :
hostname R6
!
ip cef
!
interface Loopback0
ip address 6.6.6.6 255.255.255.255
!
interface FastEthernet1/0
ip address 56.56.56.6 255.255.255.0
duplex auto
speed auto
mpls ip
!
router ospf 1
router-id 6.6.6.6
log-adjacency-changes
network 6.6.6.6 0.0.0.0 area 0
network 56.56.56.6 0.0.0.0 area 0
!
router bgp 100
no synchronization
bgp router-id 6.6.6.6
bgp log-neighbor-changes
neighbor 3.3.3.3 remote-as 100
neighbor 3.3.3.3 update-source Loopback0
no auto-summary
!
address-family vpnv4
neighbor 3.3.3.3 activate
neighbor 3.3.3.3 send-community both
exit-address-family
!
ip bgp-community new-format
In the next post I will configure the VRF’s for VPN A and VPN B.
1 Comment
Jeroen MaatmanSeptember 7th, 2009 at 10:55 pm
Thanks for this excellent site!
A few remarks however:
- In the GNS3 net file you provide R3 and R7 plus R6 and R8 are interchanged
- The IOS you use isn’t downloadable anymore from the Cisco site. The problem with the newer IOS is that the NM-16ESW module is being seen as a switch with only L2 ports. When you try to set an ip address on a port the following error is displayed: ‘% IP addresses may not be configured on L2 links’
Think I’m going to rebuild this network in GNS3 with only 7204 routers and fewer interconnections. I’ll keep you posted.
Thanks for this excellent site!
A few remarks however:
- In the GNS3 net file you provide R3 and R7 plus R6 and R8 are interchanged
- The IOS you use isn’t downloadable anymore from the Cisco site. The problem with the newer IOS is that the NM-16ESW module is being seen as a switch with only L2 ports. When you try to set an ip address on a port the following error is displayed: ‘% IP addresses may not be configured on L2 links’
Think I’m going to rebuild this network in GNS3 with only 7204 routers and fewer interconnections. I’ll keep you posted.