Aim : Enable MPLS and configure LDP on Cisco Router.
In this tutorial:
- Enable MPLS on Cisco 7200
- Configure LDP
- Verify the label generation and mapping using show cmd.
Network diagram:
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Prerequisites / Considerations
- Loopback 0 interfaces are configured with x.x.x.x/32 IP address on all routers.
- FastEthernet interfaces are configured with correct IP address on all routers.
- OSPF is up and running and able to reach all the subnets in network diagram.
- IOS : 12.4
Configuration on router R1
! ######## R1 ########
config t
config t
! Step 1 : Enable CEF (from IOS 12.2 onwards this will enabled by default)
ip cef
! Step 2 : Enable MPLS on global configuration level
mpls ip
! Step 3 : Enable LDP for MPLS protocol
mpls label pro ldp
! Step 4 : Limit label range form 100 to 199
mpls label range 100 199
! Step 5 : Set RID = loopback 0
mpls ldp router loop 0
! Step 5 : Enable MPLS on interface level
int fa 0/0
mpls ip
! Exit out configuration menu and save changes.
end
wr
! ######## END R1 ########
Configuration on router R2
! ######## R2 ########
config t
! Step 1 : Enable CEF (from IOS 12.2 onwards this will enabled by default)
ip cef
! Step 2 : Enable MPLS on global configuration level
mpls ip
! Step 3 : Enable LDP for MPLS protocol
mpls label pro ldp
! Step 4 : Limit label range form 200 to 299
mpls label range 200 299
! Step 5 : Set RID = loopback 0
mpls ldp router loop 0
! Step 5 : Enable MPLS on interface level
int fa 0/0
mpls ip
int fa 0/1
mpls ip
! Exit out configuration menu and save changes.
end
wr
! ######## END R2 ########
Configuration on router R3
! ######## R3 ########
config t
! Step 1 : Enable CEF (from IOS 12.2 onwards this will enabled by default)
ip cef
! Step 2 : Enable MPLS on global configuration level
mpls ip
! Step 3 : Enable LDP for MPLS protocol
mpls label pro ldp
! Step 4 : Limit label range form 300 to 399
mpls label range 300 399
! Step 5 : Set RID = loopback 0
mpls ldp router loop 0
! Step 5 : Enable MPLS on interface level
int fa 0/0
mpls ip
int fa 0/1
mpls ip
! Exit out configuration menu and save changes.
end
wr
! ######## END R3 ########
Configuration on router R4
! ######## R4 ########
config t
! Step 1 : Enable CEF (from IOS 12.2 onwards this will enabled by default)
ip cef
! Step 2 : Enable MPLS on global configuration level
mpls ip
! Step 3 : Enable LDP for MPLS protocol
mpls label pro ldp
! Step 4 : Limit label range form 400 to 499
mpls label range 400 499
! Step 5 : Set RID = loopback 0
mpls ldp router loop 0
! Step 5 : Enable MPLS on interface level
int fa 0/1
mpls ip
! Exit out configuration menu and save changes.
end
wr
! ######## END R4 ########
config t
! Step 1 : Enable CEF (from IOS 12.2 onwards this will enabled by default)
ip cef
! Step 2 : Enable MPLS on global configuration level
mpls ip
! Step 3 : Enable LDP for MPLS protocol
mpls label pro ldp
! Step 4 : Limit label range form 400 to 499
mpls label range 400 499
! Step 5 : Set RID = loopback 0
mpls ldp router loop 0
! Step 5 : Enable MPLS on interface level
int fa 0/1
mpls ip
! Exit out configuration menu and save changes.
end
wr
! ######## END R4 ########
Show cmds to verify MPLS - LDP
Note : Various show cmds are demonstrated in this section contains cmd output for router R2 only.
R2#sh ip route
Codes: 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
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/2] via 10.1.2.1, 00:28:57, FastEthernet0/1
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 10.2.3.3, 00:25:20, FastEthernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/3] via 10.2.3.3, 00:24:04, FastEthernet0/0
10.0.0.0/24 is subnetted, 3 subnets
C 10.1.2.0 is directly connected, FastEthernet0/1
C 10.2.3.0 is directly connected, FastEthernet0/0
O 10.3.4.0 [110/2] via 10.2.3.3, 00:25:20, FastEthernet0/0
R2#
R2#show mpls ldp bindings
tib entry: 1.1.1.1/32, rev 8
local binding: tag: 200
remote binding: tsr: 1.1.1.1:0, tag: imp-null
remote binding: tsr: 3.3.3.3:0, tag: 301
tib entry: 2.2.2.2/32, rev 2
local binding: tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 100
remote binding: tsr: 3.3.3.3:0, tag: 300
tib entry: 3.3.3.3/32, rev 10
local binding: tag: 201
remote binding: tsr: 3.3.3.3:0, tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 102
tib entry: 4.4.4.4/32, rev 14
local binding: tag: 203
remote binding: tsr: 1.1.1.1:0, tag: 104
remote binding: tsr: 3.3.3.3:0, tag: 303
tib entry: 10.1.2.0/24, rev 4
local binding: tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: imp-null
remote binding: tsr: 3.3.3.3:0, tag: 302
tib entry: 10.2.3.0/24, rev 6
local binding: tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 101
remote binding: tsr: 3.3.3.3:0, tag: imp-null
tib entry: 10.3.4.0/24, rev 12
local binding: tag: 202
remote binding: tsr: 3.3.3.3:0, tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 103
R2#
Codes: 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
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/2] via 10.1.2.1, 00:28:57, FastEthernet0/1
2.0.0.0/32 is subnetted, 1 subnets
C 2.2.2.2 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 10.2.3.3, 00:25:20, FastEthernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/3] via 10.2.3.3, 00:24:04, FastEthernet0/0
10.0.0.0/24 is subnetted, 3 subnets
C 10.1.2.0 is directly connected, FastEthernet0/1
C 10.2.3.0 is directly connected, FastEthernet0/0
O 10.3.4.0 [110/2] via 10.2.3.3, 00:25:20, FastEthernet0/0
R2#
R2#show mpls ldp bindings
tib entry: 1.1.1.1/32, rev 8
local binding: tag: 200
remote binding: tsr: 1.1.1.1:0, tag: imp-null
remote binding: tsr: 3.3.3.3:0, tag: 301
tib entry: 2.2.2.2/32, rev 2
local binding: tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 100
remote binding: tsr: 3.3.3.3:0, tag: 300
tib entry: 3.3.3.3/32, rev 10
local binding: tag: 201
remote binding: tsr: 3.3.3.3:0, tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 102
tib entry: 4.4.4.4/32, rev 14
local binding: tag: 203
remote binding: tsr: 1.1.1.1:0, tag: 104
remote binding: tsr: 3.3.3.3:0, tag: 303
tib entry: 10.1.2.0/24, rev 4
local binding: tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: imp-null
remote binding: tsr: 3.3.3.3:0, tag: 302
tib entry: 10.2.3.0/24, rev 6
local binding: tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 101
remote binding: tsr: 3.3.3.3:0, tag: imp-null
tib entry: 10.3.4.0/24, rev 12
local binding: tag: 202
remote binding: tsr: 3.3.3.3:0, tag: imp-null
remote binding: tsr: 1.1.1.1:0, tag: 103
R2#
R2#sh mpls ip binding
1.1.1.1/32
in label: 200
out label: imp-null lsr: 1.1.1.1:0 inuse
out label: 301 lsr: 3.3.3.3:0
2.2.2.2/32
in label: imp-null
out label: 100 lsr: 1.1.1.1:0
out label: 300 lsr: 3.3.3.3:0
3.3.3.3/32
in label: 201
out label: imp-null lsr: 3.3.3.3:0 inuse
out label: 102 lsr: 1.1.1.1:0
4.4.4.4/32
in label: 203
out label: 104 lsr: 1.1.1.1:0
out label: 303 lsr: 3.3.3.3:0 inuse
10.1.2.0/24
in label: imp-null
out label: imp-null lsr: 1.1.1.1:0
out label: 302 lsr: 3.3.3.3:0
10.2.3.0/24
in label: imp-null
out label: 101 lsr: 1.1.1.1:0
out label: imp-null lsr: 3.3.3.3:0
10.3.4.0/24
in label: 202
out label: imp-null lsr: 3.3.3.3:0 inuse
out label: 103 lsr: 1.1.1.1:0
R2#
R2#sh mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
200 Pop tag 1.1.1.1/32 0 Fa0/1 10.1.2.1
201 Pop tag 3.3.3.3/32 0 Fa0/0 10.2.3.3
202 Pop tag 10.3.4.0/24 0 Fa0/0 10.2.3.3
203 303 4.4.4.4/32 0 Fa0/0 10.2.3.3
R2#
R2#
1.1.1.1/32
in label: 200
out label: imp-null lsr: 1.1.1.1:0 inuse
out label: 301 lsr: 3.3.3.3:0
2.2.2.2/32
in label: imp-null
out label: 100 lsr: 1.1.1.1:0
out label: 300 lsr: 3.3.3.3:0
3.3.3.3/32
in label: 201
out label: imp-null lsr: 3.3.3.3:0 inuse
out label: 102 lsr: 1.1.1.1:0
4.4.4.4/32
in label: 203
out label: 104 lsr: 1.1.1.1:0
out label: 303 lsr: 3.3.3.3:0 inuse
10.1.2.0/24
in label: imp-null
out label: imp-null lsr: 1.1.1.1:0
out label: 302 lsr: 3.3.3.3:0
10.2.3.0/24
in label: imp-null
out label: 101 lsr: 1.1.1.1:0
out label: imp-null lsr: 3.3.3.3:0
10.3.4.0/24
in label: 202
out label: imp-null lsr: 3.3.3.3:0 inuse
out label: 103 lsr: 1.1.1.1:0
R2#
R2#sh mpls forwarding-table
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
200 Pop tag 1.1.1.1/32 0 Fa0/1 10.1.2.1
201 Pop tag 3.3.3.3/32 0 Fa0/0 10.2.3.3
202 Pop tag 10.3.4.0/24 0 Fa0/0 10.2.3.3
203 303 4.4.4.4/32 0 Fa0/0 10.2.3.3
R2#
R2#
R2#sh mpls forwarding-table detail
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
200 Pop tag 1.1.1.1/32 0 Fa0/1 10.1.2.1
MAC/Encaps=14/14, MRU=1504, Tag Stack{}
CA0002C40008CA0102C400068847
No output feature configured
Per-packet load-sharing
201 Pop tag 3.3.3.3/32 0 Fa0/0 10.2.3.3
MAC/Encaps=14/14, MRU=1504, Tag Stack{}
CA020AE80006CA0102C400088847
No output feature configured
Per-packet load-sharing
202 Pop tag 10.3.4.0/24 0 Fa0/0 10.2.3.3
MAC/Encaps=14/14, MRU=1504, Tag Stack{}
CA020AE80006CA0102C400088847
No output feature configured
Per-packet load-sharing
203 303 4.4.4.4/32 0 Fa0/0 10.2.3.3
MAC/Encaps=14/18, MRU=1500, Tag Stack{303}
CA020AE80006CA0102C400088847 0012F000
No output feature configured
Per-packet load-sharing
R2#
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
200 Pop tag 1.1.1.1/32 0 Fa0/1 10.1.2.1
MAC/Encaps=14/14, MRU=1504, Tag Stack{}
CA0002C40008CA0102C400068847
No output feature configured
Per-packet load-sharing
201 Pop tag 3.3.3.3/32 0 Fa0/0 10.2.3.3
MAC/Encaps=14/14, MRU=1504, Tag Stack{}
CA020AE80006CA0102C400088847
No output feature configured
Per-packet load-sharing
202 Pop tag 10.3.4.0/24 0 Fa0/0 10.2.3.3
MAC/Encaps=14/14, MRU=1504, Tag Stack{}
CA020AE80006CA0102C400088847
No output feature configured
Per-packet load-sharing
203 303 4.4.4.4/32 0 Fa0/0 10.2.3.3
MAC/Encaps=14/18, MRU=1500, Tag Stack{303}
CA020AE80006CA0102C400088847 0012F000
No output feature configured
Per-packet load-sharing
R2#
Full configuration for above network diagram:
Disclaimer
Information above is either from RFCs or it's Googled. This blog is result of my enthusiasm, desire and hard work to lean networking and share my leanings. Most of the times I’ll be using GNS3 network simulator. All I've here is collection of my findings, thanks to Google. Please do not ask for any of the software from CISCO/Juniper, it's better to Google it and try your luck.
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