Video:Layer-3 switching in an MPLS VPN site

From CT3

The video describes the configuration of a router connecting a small remote site with layer-3 switches to the MPLS VPN network. The L3 switches use OSPF and the CE router uses BGP to exchange routes with the MPLS VPN network.


Command	Explanation
router ospf id	Select OSPF routing process configuration
network address mask area area	Assign interfaces to OSPF areas
router bgp as-number	Select BGP routing process configuration
redistribute ospf id match internal	Redistribute internal OSPF routes into another routing protocol
*redistribute bgp as-number* subnets**	Redistribute BGP routes into OSPF
redistribute connected	Redistribute directly connected IP subnets into BGP
default-information originate always	Advertise default route into OSPF

Watch the video

Initial configurations

Configuration of the CE router

hostname CE-A
!
ip cef
!
interface Loopback0
 ip address 10.0.1.1 255.255.255.255
!
interface FastEthernet0/0
 description LAN 1
 ip address 10.2.19.1 255.255.255.252
!
interface Serial1/0
 description Link to PE-C1(ROUTER)
 ip address 192.168.1.14 255.255.255.252
 encapsulation ppp
 no peer neighbor-route
!
router bgp 65100
 no synchronization
 bgp log-neighbor-changes
 redistribute connected
 neighbor 192.168.1.13 remote-as 65000
 no auto-summary
!
end

Configuration of the L3 switch

hostname SW-A
!
ip cef
!
interface Loopback0
 ip address 10.0.1.3 255.255.255.255
!
interface Vlan101
 ip address 10.2.16.1 255.255.255.0
 ip ospf network point-to-point
!
interface Vlan102
 ip address 10.2.17.1 255.255.255.0
 ip ospf network point-to-point
!
interface Vlan103
 ip address 10.2.18.1 255.255.255.0
 ip ospf network point-to-point
!
interface FastEthernet0/0
 description Uplink
 ip address 10.2.19.2 255.255.255.252
!
router ospf 1
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 22
!
end

Final router configuration

Configuration of the CE router

hostname CE-A
!
ip cef
!
interface Loopback0
 ip address 10.0.1.1 255.255.255.255
!
interface FastEthernet0/0
 description LAN 1
 ip address 10.2.19.1 255.255.255.252
!
interface Serial1/0
 description Link to PE-C1(ROUTER)
 ip address 192.168.1.14 255.255.255.252
 encapsulation ppp
 no peer neighbor-route
!
router ospf 1
 log-adjacency-changes
 network 10.2.19.1 0.0.0.0 area 22
 default-information originate always
!
router bgp 65100
 no synchronization
 bgp log-neighbor-changes
 redistribute connected
 redistribute ospf 1 match internal
 neighbor 192.168.1.13 remote-as 65000
 no auto-summary
!
end