So let's continue with Second Post of the series. In today's post we will be building SP Core. Which will include following:
1. Establishing the basic IP Connectivity in the SP Core.
2. Enabling CEF
3. Enabling Label Distribution Protocol
4. Enabling MPLS in the SP Core
So let's bring the topology quickly:
So let's first quickly setup the IP Connectivity between R1-R2-R3 (SP Core Devices)
%%%%%%%%%%%%%%%%%%%%%%%%%%
1. Establishing the basic IP Connectivity in the SP Core.
2. Enabling CEF
3. Enabling Label Distribution Protocol
4. Enabling MPLS in the SP Core
So let's bring the topology quickly:
So let's first quickly setup the IP Connectivity between R1-R2-R3 (SP Core Devices)
%%%%%%%%%%%%%%%%%%%%%%%%%%
R1
###
!
en
!
conf t
!
ho R1
!
no ip domain-lookup
!
int f0/0
ip add 12.12.12.1 255.255.255.0
no sh
exit
!
int lo0
ip add 1.1.1.1 255.255.255.255
exit
!
router ospf 500
network 12.12.12.1 0.0.0.0 area 500
network 1.1.1.1 0.0.0.0 area 500
exit
!
end
!
wr
!
*********************************
R2
###
!
en
!
conf t
!
ho R2
!
no ip domain-lookup
!
int lo0
ip add 2.2.2.2 255.255.255.255
exit
!
int f0/0
ip add 12.12.12.2 255.255.255.0
no sh
exit
!
int f1/0
ip add 23.23.23.2 255.255.255.0
no sh
exit
!
router ospf 500
net 12.12.12.2 0.0.0.0 area 500
net 23.23.23.2 0.0.0.0 area 500
net 2.2.2.2 0.0.0.0 area 500
exit
!
end
!
wr
!
*********************************
R3
###
!
en
!
conf t
!
ho R3
!
no ip do lo
!
int lo0
ip add 3.3.3.3 255.255.255.255
exit
!
int f0/0
ip add 23.23.23.3 255.255.255.0
no sh
exit
!
router ospf 500
net 3.3.3.3 0.0.0.0 area 500
net 23.23.23.3 0.0.0.0 area 500
exit
!
end
!
wr
!
%%%%%%%%%%%%%%%%%%%%%%%%%%
Next let's quickly verify the connectivity:
R1#ping 3.3.3.3 source loopback0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/62/116 ms
R3#ping 1.1.1.1 so lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Packet sent with a source address of 3.3.3.3
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/52/80 ms
So far so good ? ...... ;-)
Let's proceed with enabling the MPLS in SP Core Network:
Step 1 > Will be to enable CEF globally on the router. Though CEF is by default enabled on Cisco Routers these days. But it never hurts to type one small command which can save your whole day. Specially it will be something stupid when you find that everything in MPLS VPN was setup correctly and in last you find that it was only CEF which was disabled. Which caused MPLS VPN to fail.
R1(config)#ip cef
Step 2 > Is to Enable Label distribution protocol. There are technically 4 protocols which can help with this named as - TDP (Tag Distribution Protocol - Cisco Proprietary), LDP (Label Distribution Protocol), BGP & RSVP. TDP is Cisco baby so most likely not going to appear in R&S Lab. LDP on the other hand is industry standard which most likely you gonna find on exam. Using BGP/RSVP for label distribution is out of scope from R&S Lab prospective.
R1(config)#mpls label protocol ?
ldp Use LDP (default)
tdp Use TDP
R1(config)#mpls label protocol ldp
Next we fix Router ID that LDP will be using:
R1(config)#mpls ldp router-id loopback 0
Step 3 > Enable MPLS on SP Core Interfaces:
R1(config)#int f0/0
R1(config-if)#mpls ip
R1(config-if)#exit
Lets follow the same steps on R2/R3 :
R2(config)#ip cef
R2(config)#mpls label protocol ldp
R2(config)#mpls ldp router-id loopback0
R2(config)#int f0/0
R2(config-if)#mpls ip
R2(config-if)#exit
R2(config)#int f1/0
R2(config-if)#mpls ip
R2(config-if)#exit
R3(config)#ip cef
R3(config)#mpls label protocol ldp
R3(config)#mpls ldp router-id loopback0
R3(config)#int f0/0
R3(config-if)#mpls ip
R3(config-if)#exit
Let's quickly verify the LDP sessions and other basic MPLS configuration:
R1#sh mpls interfaces
Interface IP Tunnel Operational
FastEthernet0/0 Yes (ldp) No Yes
R1#sh mpls ldp neighbor
Peer LDP Ident: 2.2.2.2:0; Local LDP Ident 1.1.1.1:0
TCP connection: 2.2.2.2.46225 - 1.1.1.1.646
State: Oper; Msgs sent/rcvd: 15/15; Downstream
Up time: 00:06:23
LDP discovery sources:
FastEthernet0/0, Src IP addr: 12.12.12.2
Addresses bound to peer LDP Ident:
12.12.12.2 23.23.23.2 2.2.2.2
R2#sh mpls interfaces
Interface IP Tunnel Operational
FastEthernet0/0 Yes (ldp) No Yes
FastEthernet1/0 Yes (ldp) No Yes
R2#sh mpls ldp neighbor
Peer LDP Ident: 1.1.1.1:0; Local LDP Ident 2.2.2.2:0
TCP connection: 1.1.1.1.646 - 2.2.2.2.46225
State: Oper; Msgs sent/rcvd: 16/16; Downstream
Up time: 00:07:01
LDP discovery sources:
FastEthernet0/0, Src IP addr: 12.12.12.1
Addresses bound to peer LDP Ident:
12.12.12.1 1.1.1.1
Peer LDP Ident: 3.3.3.3:0; Local LDP Ident 2.2.2.2:0
TCP connection: 3.3.3.3.64294 - 2.2.2.2.646
State: Oper; Msgs sent/rcvd: 14/14; Downstream
Up time: 00:05:19
LDP discovery sources:
FastEthernet1/0, Src IP addr: 23.23.23.3
Addresses bound to peer LDP Ident:
23.23.23.3 3.3.3.3
R3#sh mpls interfaces
Interface IP Tunnel Operational
FastEthernet0/0 Yes (ldp) No Yes
R3#sh mpls ldp neighbor
Peer LDP Ident: 2.2.2.2:0; Local LDP Ident 3.3.3.3:0
TCP connection: 2.2.2.2.646 - 3.3.3.3.64294
State: Oper; Msgs sent/rcvd: 15/15; Downstream
Up time: 00:06:04
LDP discovery sources:
FastEthernet0/0, Src IP addr: 23.23.23.2
Addresses bound to peer LDP Ident:
12.12.12.2 23.23.23.2 2.2.2.2
So last step for today - Let's quickly verify MPLS Label operation using traceroute command:
R1#traceroute 3.3.3.3 source loopback 0
Type escape sequence to abort.
Tracing the route to 3.3.3.3
1 12.12.12.2 [MPLS: Label 17 Exp 0] 140 msec 132 msec 128 msec
2 23.23.23.3 152 msec * 144 msec
R3#traceroute 1.1.1.1 source loopback 0
Type escape sequence to abort.
Tracing the route to 1.1.1.1
1 23.23.23.2 [MPLS: Label 16 Exp 0] 212 msec 228 msec 144 msec
2 12.12.12.1 64 msec * 132 msec
So far so cool.
In Next Post we will be setting up Normal BGP Session and VRF Sessions.
Stay Tuned.........
HTH...
Deepak Arora
Evil CCIE
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