MPLS: What is the MPLS Label distributing protocol (LDP)? How does LDP work?

Label distributing protocol (LDP) is a protocol that is automatically generated and exchanges labels between MPLS routers. Each MPLS router will locally generate labels for its prefixes and then it will advertise the label values to its neighbors.…

Label distributing protocol (LDP) Work with IGP inside the core. It’s a standard protocol; LDP is based on Cisco’s proprietary Tag Distribution Protocol (TDP). LDP establishes a neighbor relationship using UDP (port 646) hellos multicast packets are sent 224.0.0.2. Each router has a unique router ID called LSR ID.

How does Label distributing protocol (LDP works?

IGP built routing table (fib using CEF)
LSR assigns a local label for each route learned
LSR share labels with a neighbor using LDP
LSR built their own LFIB
Forward packets based on label lookup

1. Introduction of MPLS

2. What is MPLS Label distributing protocol (LDP)? How LDP works?

3. how to configure MPLS LDP Peering?

4. What is MPLS L3 VPN? How to configure?

5. How to configure MPLS L3 VPN with RIPv2?

6. How to configure MPLS L3 VPN with EIGRP?

7. How to configure MPLS L3 VPN with OSPF?

8. What are OSPF Sham Links? how to configure OSPF Sham Links?

9. How to configure MPLS L3 with BGP AS OVERRIDE?

10. What Is Network Tunneling And How To Configure Generic Routing Encapsulation (GRE) Tunnels?

11. What Is DMVPN (Dynamic Multipoint VPN), NHRP, MGRE, And How To Configure DMVPN Phase 1?

12. What Is DMVPN (Dynamic Multipoint VPN) Phase 2? How To Configure DMVPN Phase 2 Dynamic And Static Mapping?

13. How To Configure EIGRP And OSPF Over DMVPN Phase 1 & 2?

14. How To Configure External BGP And EIGRP On DMVPN Phase 2?

15. What Is IPSec (Internet Protocol Security)? What Is Internet Key Exchange IKE? How To Configure IPSec Tunnel?

16. What Is IKE (Internet Key Exchange)? How To Configure IPSec Site-To-Site?

let's see the configuration:-

Topology:

Goal:

configure the topology as per the diagram.
assign an IP address to their receptive interfaces configure EIGRP 100 and advertise directly connected interfaces configure MPLS on all the routers with LDP protocol.
configure LDP router ID has to be loop-back address 0
configure labels.
check the connectivity with traceroute between router 1 and router 4.

R1(config)#Interface fastethernet 0/0

R1(config-if)#Ip address 10.1.1.1 255.0.0.0

R1(config-if)#No shutdown

R1(config-if)#No keepalive

R1(config-if)#Exit

R1(config)#Interface serial 3/0

R1(config-if)#Ip address 1.1.1.1 255.0.0.0

R1(config-if)#No shutdown

R1(config-if)#Exit

R1(config)#Interface loopback 0

R1(config-if)#Ip address 11.0.0.1 255.255.255.0

R1(config-if)#Exit

R1(config)#Interface loopback 1

R1(config-if)#Ip address 11.0.1.1 255.255.255.0

R1(config-if)#Exit

R1(config)#Interface loopback 2

R1(config-if)#Ip address 11.0.2.1 255.255.255.0

R1(config-if)#Exit

R1(config)#Interface loopback 3

R1(config-if)#Ip address 11.0.3.1 255.255.255.0

R1(config-if)#Exit

R2(config)#Interface fastethernet 0/0

R2(config-if)#Ip address 20.1.1.1 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#No keepalive

R2(config-if)#Exit

R2(config)#Interface serial 3/0

R2(config-if)#Ip address 1.1.1.2 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#Exit

R2(config)#Interface serial 3/1

R2(config-if)#Ip address 2.2.2.1 255.0.0.0

R2(config-if)#No shutdown

R2(config-if)#Exit

R2(config)#Interface loopback 1

R2(config-if)#Ip address 12.0.1.1 255.255.255.0

R2(config-if)#Exit

R2(config)#Interface loopback 2

R2(config-if)#Ip address 12.0.2.1 255.255.255.0

R2(config-if)#Exit

R2(config)#Interface loopback 3

R2(config-if)#Ip address 12.0.3.1 255.255.255.0

R2(config-if)#Exit

R3(config)#Interface fastethernet 0/0

R3(config-if)#Ip address 30.1.1.1 255.0.0.0

R3(config-if)#No shutdown

R3(config-if)#No keepalive

R3(config-if)#Exit

R3(config)#Interface serial 3/1

R3(config-if)#Ip address 2.2.2.2 255.0.0.0

R3(config-if)#No shutdown

R3(config-if)#Exit

R3(config)#Interface serial 3/2

R3(config-if)#Ip address 3.3.3.1 255.0.0.0

R3(config-if)#No shutdown

R3(config-if)#Exit

R3(config)#Interface loopback 0

R3(config-if)#Ip address 13.0.0.1 255.255.255.0

R3(config-if)#Exit

R3(config)#Interface loopback 1

R3(config-if)#Ip address 13.0.1.1 255.255.255.0

R3(config-if)#Exit

R3(config)#Interface loopback 2

R3(config-if)#Ip address 13.0.2.1 255.255.255.0

R3(config-if)#Exit

R3(config)#Interface loopback 3

R3(config-if)#Ip address 13.0.3.1 255.255.255.0

R3(config-if)#exit

R4(config)#Interface fastethernet 0/0

R4(config-if)#Ip address 40.1.1.1 255.0.0.0

R4(config-if)#No shutdown

R4(config-if)#No keepalive

R4(config-if)#Exit

R4(config)#Interface serial 3/2

R4(config-if)#Ip address 3.3.3.2 255.0.0.0

R4(config-if)#No shutdown

R4(config-if)#Exit

R4(config)#Interface loopback 0

R4(config-if)#Ip address 14.0.0.1 255.255.255.0

R4(config-if)#Exit

R4(config)#Interface loopback 1

R4(config-if)#Ip address 14.0.1.1 255.255.255.0

R4(config-if)#Exit

R4(config)#Interface loopback 2

R4(config-if)#Ip address 14.0.2.1 255.255.255.0

R4(config-if)#Exit

R4(config)#Interface loopback 3

R4(config-if)#Ip address 14.0.3.1 255.255.255.0

R4(config-if)#Exit

R1(config)#router eigrp 100

R1(config-router)#network 1.0.0.0

R1(config-router)#network 10.0.0.0

R1(config-router)#network 11.0.0.0

R1(config-router)#no auto-summary

R1(config-router)#exit

*Jan 9 23:58:37.835: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 1.1.1.2 (Serial3/0) is up: new adjacency

R2(config)#router eigrp 100

R2(config-router)#network 2.0.0.0

R2(config-router)#network 20.0.0.0

R2(config-router)#network 1.0.0.0

R2(config-router)#network 12.0.0.0

R2(config-router)#no auto-summary

R2(config-router)#exit

*Jan 10 00:16:23.063: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 2.2.2.2 (Serial3/1) is up: new adjacency

*Jan 10 00:16:32.295: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 1.1.1.1 (Serial3/0) is up: new adjacency

R3(config)#router eigrp 100

R3(config-router)#network 2.0.0.0

R3(config-router)#network 3.0.0.0

R3(config-router)#network 30.0.0.0

R3(config-router)#network 13.0.0.0

R3(config-router)#exit

*Jan 10 00:02:30.555: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 2.2.2.1 (Serial3/1) is up: new adjacency

*Jan 10 00:03:32.187: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 3.3.3.2 (Serial3/2) is up: new adjacency

R4(config)#router eigrp 100

R4(config-router)#network 3.0.0.0

R4(config-router)#network 40.0.0.0

R4(config-router)#network 14.0.0.0

R4(config-router)#no auto-summary

R4(config-router)#exit

*Jan 10 00:03:22.463: %DUAL-5-NBRCHANGE: EIGRP-IPv4 100: Neighbor 3.3.3.1 (Serial3/2) is up: new adjacency

R1#show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 1.0.0.0/8 is directly connected, Serial3/0

L 1.1.1.1/32 is directly connected, Serial3/0

D 2.0.0.0/8 [90/2681856] via 1.1.1.2, 00:03:36, Serial3/0

D 3.0.0.0/8 [90/3193856] via 1.1.1.2, 00:03:36, Serial3/0

10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 10.0.0.0/8 is directly connected, FastEthernet0/0

L 10.1.1.1/32 is directly connected, FastEthernet0/0

11.0.0.0/8 is variably subnetted, 8 subnets, 2 masks

C 11.0.0.0/24 is directly connected, Loopback0

L 11.0.0.1/32 is directly connected, Loopback0

C 11.0.1.0/24 is directly connected, Loopback1

L 11.0.1.1/32 is directly connected, Loopback1

C 11.0.2.0/24 is directly connected, Loopback2

L 11.0.2.1/32 is directly connected, Loopback2

C 11.0.3.0/24 is directly connected, Loopback3

L 11.0.3.1/32 is directly connected, Loopback3

12.0.0.0/24 is subnetted, 3 subnets

D 12.0.1.0 [90/2297856] via 1.1.1.2, 00:03:36, Serial3/0

D 12.0.2.0 [90/2297856] via 1.1.1.2, 00:03:36, Serial3/0

D 12.0.3.0 [90/2297856] via 1.1.1.2, 00:03:36, Serial3/0

13.0.0.0/24 is subnetted, 4 subnets

D 13.0.0.0 [90/2809856] via 1.1.1.2, 00:03:36, Serial3/0

D 13.0.1.0 [90/2809856] via 1.1.1.2, 00:03:36, Serial3/0

D 13.0.2.0 [90/2809856] via 1.1.1.2, 00:03:36, Serial3/0

D 13.0.3.0 [90/2809856] via 1.1.1.2, 00:03:36, Serial3/0

14.0.0.0/24 is subnetted, 4 subnets

D 14.0.0.0 [90/3321856] via 1.1.1.2, 00:03:36, Serial3/0

D 14.0.1.0 [90/3321856] via 1.1.1.2, 00:03:36, Serial3/0

D 14.0.2.0 [90/3321856] via 1.1.1.2, 00:03:36, Serial3/0

D 14.0.3.0 [90/3321856] via 1.1.1.2, 00:03:36, Serial3/0

D 20.0.0.0/8 [90/2172416] via 1.1.1.2, 00:03:36, Serial3/0

D 30.0.0.0/8 [90/2684416] via 1.1.1.2, 00:03:36, Serial3/0

D 40.0.0.0/8 [90/3196416] via 1.1.1.2, 00:00:38, Serial3/0

R2#show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 1.0.0.0/8 is directly connected, Serial3/0

L 1.1.1.2/32 is directly connected, Serial3/0

2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 2.0.0.0/8 is directly connected, Serial3/1

L 2.2.2.1/32 is directly connected, Serial3/1

D 3.0.0.0/8 [90/2681856] via 2.2.2.2, 00:11:40, Serial3/1

D 10.0.0.0/8 [90/2172416] via 1.1.1.1, 00:01:08, Serial3/0

11.0.0.0/24 is subnetted, 4 subnets

D 11.0.0.0 [90/2297856] via 1.1.1.1, 00:04:25, Serial3/0

D 11.0.1.0 [90/2297856] via 1.1.1.1, 00:04:24, Serial3/0

D 11.0.2.0 [90/2297856] via 1.1.1.1, 00:04:24, Serial3/0

D 11.0.3.0 [90/2297856] via 1.1.1.1, 00:04:24, Serial3/0

12.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C 12.0.1.0/24 is directly connected, Loopback1

L 12.0.1.1/32 is directly connected, Loopback1

C 12.0.2.0/24 is directly connected, Loopback2

L 12.0.2.1/32 is directly connected, Loopback2

C 12.0.3.0/24 is directly connected, Loopback3

L 12.0.3.1/32 is directly connected, Loopback3

13.0.0.0/24 is subnetted, 4 subnets

D 13.0.0.0 [90/2297856] via 2.2.2.2, 00:11:40, Serial3/1

D 13.0.1.0 [90/2297856] via 2.2.2.2, 00:11:40, Serial3/1

D 13.0.2.0 [90/2297856] via 2.2.2.2, 00:11:40, Serial3/1

D 13.0.3.0 [90/2297856] via 2.2.2.2, 00:11:40, Serial3/1

14.0.0.0/24 is subnetted, 4 subnets

D 14.0.0.0 [90/2809856] via 2.2.2.2, 00:10:29, Serial3/1

D 14.0.1.0 [90/2809856] via 2.2.2.2, 00:10:29, Serial3/1

D 14.0.2.0 [90/2809856] via 2.2.2.2, 00:10:29, Serial3/1

D 14.0.3.0 [90/2809856] via 2.2.2.2, 00:10:29, Serial3/1

20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 20.0.0.0/8 is directly connected, FastEthernet0/0

L 20.1.1.1/32 is directly connected, FastEthernet0/0

D 30.0.0.0/8 [90/2172416] via 2.2.2.2, 00:11:40, Serial3/1

D 40.0.0.0/8 [90/2684416] via 2.2.2.2, 00:10:34, Serial3/1

R3#show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

+ - replicated route, % - next hop override

Gateway of last resort is not set

D 1.0.0.0/8 [90/2681856] via 2.2.2.1, 00:11:39, Serial3/1

2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 2.0.0.0/8 is directly connected, Serial3/1

L 2.2.2.2/32 is directly connected, Serial3/1

3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 3.0.0.0/8 is directly connected, Serial3/2

L 3.3.3.1/32 is directly connected, Serial3/2

D 10.0.0.0/8 [90/2684416] via 2.2.2.1, 00:01:16, Serial3/1

11.0.0.0/24 is subnetted, 4 subnets

D 11.0.0.0 [90/2809856] via 2.2.2.1, 00:04:33, Serial3/1

D 11.0.1.0 [90/2809856] via 2.2.2.1, 00:04:33, Serial3/1

D 11.0.2.0 [90/2809856] via 2.2.2.1, 00:04:32, Serial3/1

D 11.0.3.0 [90/2809856] via 2.2.2.1, 00:04:32, Serial3/1

12.0.0.0/24 is subnetted, 3 subnets

D 12.0.1.0 [90/2297856] via 2.2.2.1, 00:11:34, Serial3/1

D 12.0.2.0 [90/2297856] via 2.2.2.1, 00:11:34, Serial3/1

D 12.0.3.0 [90/2297856] via 2.2.2.1, 00:11:34, Serial3/1

13.0.0.0/8 is variably subnetted, 8 subnets, 2 masks

C 13.0.0.0/24 is directly connected, Loopback0

L 13.0.0.1/32 is directly connected, Loopback0

C 13.0.1.0/24 is directly connected, Loopback1

L 13.0.1.1/32 is directly connected, Loopback1

C 13.0.2.0/24 is directly connected, Loopback2

L 13.0.2.1/32 is directly connected, Loopback2

C 13.0.3.0/24 is directly connected, Loopback3

L 13.0.3.1/32 is directly connected, Loopback3

14.0.0.0/24 is subnetted, 4 subnets

D 14.0.0.0 [90/2297856] via 3.3.3.2, 00:10:37, Serial3/2

D 14.0.1.0 [90/2297856] via 3.3.3.2, 00:10:37, Serial3/2

D 14.0.2.0 [90/2297856] via 3.3.3.2, 00:10:37, Serial3/2

D 14.0.3.0 [90/2297856] via 3.3.3.2, 00:10:37, Serial3/2

D 20.0.0.0/8 [90/2172416] via 2.2.2.1, 00:11:44, Serial3/1

30.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 30.0.0.0/8 is directly connected, FastEthernet0/0

L 30.1.1.1/32 is directly connected, FastEthernet0/0

D 40.0.0.0/8 [90/2172416] via 3.3.3.2, 00:10:42, Serial3/2

R4#show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

+ - replicated route, % - next hop override

Gateway of last resort is not set

D 1.0.0.0/8 [90/3193856] via 3.3.3.1, 00:10:20, Serial3/2

D 2.0.0.0/8 [90/2681856] via 3.3.3.1, 00:10:20, Serial3/2

3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 3.0.0.0/8 is directly connected, Serial3/2

L 3.3.3.2/32 is directly connected, Serial3/2

D 10.0.0.0/8 [90/3196416] via 3.3.3.1, 00:00:50, Serial3/2

11.0.0.0/24 is subnetted, 4 subnets

D 11.0.0.0 [90/3321856] via 3.3.3.1, 00:04:06, Serial3/2

D 11.0.1.0 [90/3321856] via 3.3.3.1, 00:04:06, Serial3/2

D 11.0.2.0 [90/3321856] via 3.3.3.1, 00:04:06, Serial3/2

D 11.0.3.0 [90/3321856] via 3.3.3.1, 00:04:06, Serial3/2

12.0.0.0/24 is subnetted, 3 subnets

D 12.0.1.0 [90/2809856] via 3.3.3.1, 00:10:20, Serial3/2

D 12.0.2.0 [90/2809856] via 3.3.3.1, 00:10:20, Serial3/2

D 12.0.3.0 [90/2809856] via 3.3.3.1, 00:10:20, Serial3/2

13.0.0.0/24 is subnetted, 4 subnets

D 13.0.0.0 [90/2297856] via 3.3.3.1, 00:10:20, Serial3/2

D 13.0.1.0 [90/2297856] via 3.3.3.1, 00:10:20, Serial3/2

D 13.0.2.0 [90/2297856] via 3.3.3.1, 00:10:20, Serial3/2

D 13.0.3.0 [90/2297856] via 3.3.3.1, 00:10:20, Serial3/2

14.0.0.0/8 is variably subnetted, 8 subnets, 2 masks

C 14.0.0.0/24 is directly connected, Loopback0

L 14.0.0.1/32 is directly connected, Loopback0

C 14.0.1.0/24 is directly connected, Loopback1

L 14.0.1.1/32 is directly connected, Loopback1

C 14.0.2.0/24 is directly connected, Loopback2

L 14.0.2.1/32 is directly connected, Loopback2

C 14.0.3.0/24 is directly connected, Loopback3

L 14.0.3.1/32 is directly connected, Loopback3

D 20.0.0.0/8 [90/2684416] via 3.3.3.1, 00:10:20, Serial3/2

D 30.0.0.0/8 [90/2172416] via 3.3.3.1, 00:10:20, Serial3/2

40.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 40.0.0.0/8 is directly connected, FastEthernet0/0

L 40.1.1.1/32 is directly connected, FastEthernet0/0

R1(config)#mpls label range 99 199

R1(config)#mpls label protocol ldp

R1(config)#mpls ldp router-id loopback 0

R1(config)#interface serial3/0

R1(config-if)#mpls ip

R1(config-if)#exit

*Jan 10 00:24:38.655: %LDP-5-NBRCHG: LDP Neighbor 12.0.1.1:0 (1) is UP

R2(config)#mpls label range 200 299

R2(config)#mpls label protocol ldp

R2(config)#mpls ldp router-id loopback 0

R2(config)#interface serial 3/0

R2(config-if)#mpls ip

R2(config-if)#exit

*Jan 10 00:36:03.895: %LDP-5-NBRCHG: LDP Neighbor 11.0.0.1:0 (1) is UP

R2(config)#interface serial 3/1

R2(config-if)#mpls ip

R2(config-if)#exit

*Jan 10 00:37:52.651: %LDP-5-NBRCHG: LDP Neighbor 13.0.0.1:0 (2) is UP

R3(config)#mpls label range 300 399

R3(config)#mpls label protocol ldp

R3(config)#mpls ldp router-id loopback 0

R3(config)#interface serial 3/1

R3(config-if)#mpls ip

R3(config-if)#exit

*Jan 10 00:24:00.095: %LDP-5-NBRCHG: LDP Neighbor 12.0.1.1:0 (1) is UP

R3(config)#interface serial 3/2

R3(config-if)#mpls ip

R3(config-if)#exit

*Jan 10 00:27:00.071: %LDP-5-NBRCHG: LDP Neighbor 14.0.0.1:0 (2) is UP

R4(config)#mpls label range 400 499

R4(config)#mpls label protocol ldp

R4(config)#mpls ldp router-id loopback 0

R4(config)#interface serial 3/2

R4(config-if)#mpls ip

R4(config-if)#exit

*Jan 10 00:26:50.247: %LDP-5-NBRCHG: LDP Neighbor 13.0.0.1:0 (1) is UP

R2#show mpls ldp neighbor

Peer LDP Ident: 11.0.0.1:0; Local LDP Ident 12.0.1.1:0

TCP connection: 11.0.0.1.646 - 12.0.1.1.26752

State: Oper; Msgs sent/rcvd: 36/36; Downstream

Up time: 00:10:02

LDP discovery sources:

Serial3/0, Src IP addr: 1.1.1.1

Addresses bound to peer LDP Ident:

10.1.1.1 1.1.1.1 11.0.0.1 11.0.1.1

11.0.2.1 11.0.3.1

Peer LDP Ident: 13.0.0.1:0; Local LDP Ident 12.0.1.1:0

TCP connection: 13.0.0.1.39554 - 12.0.1.1.646

State: Oper; Msgs sent/rcvd: 34/34; Downstream

Up time: 00:08:13

LDP discovery sources:

Serial3/1, Src IP addr: 2.2.2.2

Addresses bound to peer LDP Ident:

30.1.1.1 2.2.2.2 3.3.3.1 13.0.0.1

13.0.1.1 13.0.2.1 13.0.3.1

R3#show mpls ldp neighbor

Peer LDP Ident: 12.0.1.1:0; Local LDP Ident 13.0.0.1:0

TCP connection: 12.0.1.1.646 - 13.0.0.1.39554

State: Oper; Msgs sent/rcvd: 33/33; Downstream

Up time: 00:07:41

LDP discovery sources:

Serial3/1, Src IP addr: 2.2.2.1

Addresses bound to peer LDP Ident:

20.1.1.1 1.1.1.2 2.2.2.1 12.0.1.1

12.0.2.1 12.0.3.1

Peer LDP Ident: 14.0.0.1:0; Local LDP Ident 13.0.0.1:0

TCP connection: 14.0.0.1.20440 - 13.0.0.1.646

State: Oper; Msgs sent/rcvd: 30/30; Downstream

Up time: 00:04:41

LDP discovery sources:

Serial3/2, Src IP addr: 3.3.3.2

Addresses bound to peer LDP Ident:

40.1.1.1 3.3.3.2 14.0.0.1 14.0.1.1

14.0.2.1 14.0.3.1

R3#show mpls interfaces

Interface IP Tunnel BGP Static Operational

Serial3/1 Yes (ldp) No No No Yes

Serial3/2 Yes (ldp) No No No Yes

R1#show mpls ldp bindings 40.0.0.0 255.0.0.0

lib entry: 40.0.0.0/8, rev 44

local binding: label: 114

remote binding: lsr: 12.0.1.1:0, label: 215

R1#show mpls forwarding-table

Local Outgoing Prefix Bytes Label Outgoing Next Hop

Label Label or Tunnel Id Switched interface

99 Pop Label 2.0.0.0/8 0 Se3/0 point2point

100 200 3.0.0.0/8 0 Se3/0 point2point

101 Pop Label 12.0.1.0/24 0 Se3/0 point2point

102 Pop Label 12.0.2.0/24 0 Se3/0 point2point

103 Pop Label 12.0.3.0/24 0 Se3/0 point2point

104 206 13.0.0.0/24 0 Se3/0 point2point

105 207 13.0.1.0/24 0 Se3/0 point2point

106 208 13.0.2.0/24 0 Se3/0 point2point

107 209 13.0.3.0/24 0 Se3/0 point2point

108 210 14.0.0.0/24 0 Se3/0 point2point

109 211 14.0.1.0/24 0 Se3/0 point2point

110 212 14.0.2.0/24 0 Se3/0 point2point

111 213 14.0.3.0/24 0 Se3/0 point2point

112 Pop Label 20.0.0.0/8 0 Se3/0 point2point

113 214 30.0.0.0/8 0 Se3/0 point2point

114 215 40.0.0.0/8 0 Se3/0 point2point

R1#show mpls forwarding-table 40.1.1.1

Local Outgoing Prefix Bytes Label Outgoing Next Hop

Label Label or Tunnel Id Switched interface

114 215 40.0.0.0/8 0 Se3/0 point2point

R1#traceroute 40.1.1.1 source 10.1.1.1

Type escape sequence to abort.

Tracing the route to 40.1.1.1

VRF info: (vrf in name/id, vrf out name/id)

1 1.1.1.2 [MPLS: Label 215 Exp 0] 116 msec 48 msec 80 msec

2 2.2.2.2 [MPLS: Label 314 Exp 0] 44 msec 28 msec 56 msec

3 3.3.3.2 44 msec 44 msec 68 msec

R4#traceroute 11.0.0.1 source 14.0.0.1

Type escape sequence to abort.

Tracing the route to 11.0.0.1

VRF info: (vrf in name/id, vrf out name/id)

1 3.3.3.1 [MPLS: Label 302 Exp 0] 160 msec 116 msec 196 msec

2 2.2.2.1 [MPLS: Label 202 Exp 0] 128 msec 112 msec 128 msec

3 1.1.1.1 208 msec 120 msec 180 msec

MPLS

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What is the MPLS Label distributing protocol (LDP)? How does LDP work?

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