Step 1: Configure hostname and IP addresses on all the routers.

*********************************CSG
sys
#
sysname CSG
#
interface GigabitEthernet0/0/0
 ip address 10.10.10.1 255.255.255.254
#
interface LoopBack0
 ip address 4.4.4.4 255.255.255.255
#

*********************************ASG
sys
#
sysname ASG
#
interface GigabitEthernet0/0/0
 ip address 10.10.10.0 255.255.255.254
#
interface GigabitEthernet0/0/1
 ip address 10.10.10.3 255.255.255.254
#
interface LoopBack0
 ip address 3.3.3.3 255.255.255.255
#

*********************************ABR
sys
#
sysname ABR
#
interface GigabitEthernet0/0/0
 ip address 10.10.10.2 255.255.255.254
#
interface GigabitEthernet0/0/1
 ip address 10.10.10.5 255.255.255.254
#
interface LoopBack0
 ip address 2.2.2.2 255.255.255.255
#

*********************************MASG
sys
#
sysname MASG
#
interface GigabitEthernet0/0/0
 ip address 10.10.10.4 255.255.255.254
interface LoopBack0
 ip address 1.1.1.1 255.255.255.255
#

Step 2: Configure MPLS and MPLS LDP on all the routers. Enable MPLS and MPLS LDP on interfaces

****************************CSG
#
mpls lsr-id 4.4.4.4
mpls
#
mpls ldp
#
interface GigabitEthernet0/0/0
mpls
mpls ldp

****************************ASG
#
mpls lsr-id 3.3.3.3
mpls
#
mpls ldp
#
interface GigabitEthernet0/0/0
mpls
mpls ldp
#
interface GigabitEthernet0/0/1
mpls
mpls ldp

****************************ABR
#
mpls lsr-id 2.2.2.2
mpls
#
mpls ldp
#
interface GigabitEthernet0/0/0
mpls
mpls ldp
#
interface GigabitEthernet0/0/1
mpls
mpls ldp

****************************MASG
#
mpls lsr-id 1.1.1.1
mpls
#
mpls ldp
#
interface GigabitEthernet0/0/0
mpls
mpls ldp

Step 3: Configure IGP in access, aggregation, and core layers.

*****************************CSG
#
ospf 10 router-id 4.4.4.4
 area 0.0.0.0
  network 4.4.4.4 0.0.0.0
  network 10.10.10.0 0.0.0.1
#

*****************************ASG
#
ospf 10 router-id 3.3.3.3
 area 0.0.0.0
  network 3.3.3.3 0.0.0.0
  network 10.10.10.0 0.0.0.1
#
isis 10
 is-level level-2
 cost-style wide
 network-entity 49.0010.0030.0300.3003.00
 is-name ASG
#
interface GigabitEthernet0/0/1
isis enable 10
#
interface Loopback0
isis enable 10

*****************************ABR
#
ospf 20 router-id 2.2.2.2
 area 0.0.0.0
  network 2.2.2.2 0.0.0.0
  network 10.10.10.4 0.0.0.1
#
isis 10
 is-level level-2
 cost-style wide
 network-entity 49.0010.0020.0200.2002.00
 is-name ABR
#
interface GigabitEthernet0/0/0
isis enable 10
#
interface Loopback0
isis enable 10

*****************************MASG
#
ospf 20 router-id 1.1.1.1
 area 0.0.0.0
  network 1.1.1.1 0.0.0.0
  network 10.10.10.4 0.0.0.1
#

Verify IGP running status on all the routers.

Step 4: Configure BGP peering at each layer and enable devices to exchange labeled routes.

*********************************CSG
#
bgp 500
 router-id 4.4.4.4
 peer 3.3.3.3 as-number 500
 peer 3.3.3.3 connect-interface LoopBack0
 #
 ipv4-family unicast
  network 4.4.4.4 255.255.255.255
  peer 3.3.3.3 enable
  peer 3.3.3.3 label-route-capability
#

*********************************ASG
#
bgp 500
 router-id 3.3.3.3
 peer 4.4.4.4 as-number 500
 peer 4.4.4.4 connect-interface LoopBack0
 peer 2.2.2.2 as-number 500
 peer 2.2.2.2 connect-interface LoopBack0
 #
 ipv4-family unicast
  peer 4.4.4.4 enable
  peer 4.4.4.4 label-route-capability
  peer 2.2.2.2 enable
  peer 2.2.2.2 label-route-capability
#

*********************************ABR
#
bgp 500
 router-id 2.2.2.2
 peer 1.1.1.1 as-number 500
 peer 1.1.1.1 connect-interface LoopBack0
 peer 3.3.3.3 as-number 500
 peer 3.3.3.3 connect-interface LoopBack0
 #
 ipv4-family unicast
  peer 1.1.1.1 enable
  peer 1.1.1.1 label-route-capability
  peer 3.3.3.3 enable
  peer 3.3.3.3 label-route-capability
#

*********************************MASG
#
bgp 500
 router-id 1.1.1.1
 peer 2.2.2.2 as-number 500
 peer 2.2.2.2 connect-interface LoopBack0
 #
 ipv4-family unicast
  network 2.2.2.2 255.255.255.255
  peer 2.2.2.2 enable
  peer 2.2.2.2 label-route-capability
#

Verify BGP peering status on all routers.

Step 5: Configure ASG and ABR as the RRs to advertise routes from CSG to MASG and vice-versa

**************************ASG
bgp 500
peer 4.4.4.4 reflect-client
peer 4.4.4.4 next-hop-local
peer 2.2.2.2 reflect-client
peer 2.2.2.2 next-hop-local

**************************ABR
bgp 500
peer 1.1.1.1 reflect-client
peer 1.1.1.1 next-hop-local
peer 3.3.3.3 reflect-client
peer 3.3.3.3 next-hop-local

Step 6: Configure a routing policy on each device to establish a BGP LSP

*************************CSG
#
route-policy ADVERTISE_ROUTES permit node 10
 apply mpls-label
#
bgp 500
  peer 3.3.3.3 route-policy ADVERTISE_ROUTES export
#

************************ASG
#
route-policy ADVERTISE_ROUTES permit node 10
 if-match mpls-label
 apply mpls-label
#
bgp 500
peer 2.2.2.2 route-policy ADVERTISE_ROUTES export
peer 4.4.4.4 route-policy ADVERTISE_ROUTES export
#

************************ABR
#
route-policy ADVERTISE_ROUTES permit node 10
 if-match mpls-label
 apply mpls-label
#
bgp 500
peer 3.3.3.3 route-policy ADVERTISE_ROUTES export
peer 1.1.1.1 route-policy ADVERTISE_ROUTES export
#

*************************MASG
#
route-policy ADVERTISE_ROUTES permit node 10
 apply mpls-label
#
bgp 500
  peer 2.2.2.2 route-policy ADVERTISE_ROUTES export
#

Verify the connectivity between CSG and MASG.

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