mpls traffic-eng tunnels
mpls traffic-eng reoptimize timers frequency 30
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Tunnel1
ip unnumbered Loopback0
tunnel destination 2.2.2.2
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng path-option 10 explicit name R1-R4-R2
tunnel mpls traffic-eng path-option 20 dynamic
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet0/1
ip address 192.168.14.1 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet1/0
ip address 192.168.15.1 255.255.255.0
!
router ospf 1
mpls traffic-eng router-id Loopback0
mpls traffic-eng area 0
network 1.1.1.1 0.0.0.0 area 0
network 192.168.12.1 0.0.0.0 area 0
network 192.168.14.1 0.0.0.0 area 0
network 192.168.15.1 0.0.0.0 area 0
!
ip explicit-path name R1-R4-R2 enable
index 2 next-address 192.168.14.4
index 4 next-address 192.168.24.2
R2 Config
mpls traffic-eng tunnels
!
interface Loopback0
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.12.2 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet0/1
ip address 192.168.23.2 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet1/0
ip address 192.168.24.2 255.255.255.0
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
router ospf 1
mpls traffic-eng router-id Loopback0
mpls traffic-eng area 0
network 2.2.2.2 0.0.0.0 area 0
network 192.168.12.2 0.0.0.0 area 0
network 192.168.23.2 0.0.0.0 area 0
network 192.168.24.2 0.0.0.0 area 0
R3 Config
mpls traffic-eng tunnels
!
interface Loopback0
ip address 3.3.3.3 255.255.255.255
!
interface Loopback1
ip address 3.3.3.33 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.23.3 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet0/1
ip address 192.168.34.3 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet1/0
ip address 192.168.35.3 255.255.255.0
!
router ospf 1
mpls traffic-eng router-id Loopback0
mpls traffic-eng area 0
network 3.3.3.3 0.0.0.0 area 0
network 3.3.3.3 0.0.0.0 area 0
network 192.168.23.3 0.0.0.0 area 0
network 192.168.34.3 0.0.0.0 area 0
network 192.168.35.3 0.0.0.0 area 0
R4 Config
mpls traffic-eng tunnels
!
interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.14.4 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet0/1
ip address 192.168.34.4 255.255.255.0
ip ospf cost 10
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
interface FastEthernet1/0
ip address 192.168.24.4 255.255.255.0
ip ospf cost 1
mpls ip
mpls traffic-eng tunnels
ip rsvp bandwidth
!
router ospf 1
mpls traffic-eng router-id Loopback0
mpls traffic-eng area 0
network 4.4.4.4 0.0.0.0 area 0
network 192.168.14.4 0.0.0.0 area 0
network 192.168.24.4 0.0.0.0 area 0
network 192.168.34.4 0.0.0.0 area 0
R5 Config
interface Loopback0
ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
ip address 192.168.15.5 255.255.255.0
!
interface FastEthernet0/1
ip address 192.168.35.5 255.255.255.0
!
router ospf 1
network 5.5.5.5 0.0.0.0 area 0
network 192.168.15.5 0.0.0.0 area 0
network 192.168.35.5 0.0.0.0 area 0
-As per the above config, we have tunnel 1 on R1 terminating at R2.
But we are not using the tunnel forwarding down the traffic.
In this lab, our concerned is only 3.3.3.3/32 and 3.3.3.33/32.
R1#show ip route ospf
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.12.2, 00:01:35, FastEthernet0/0
3.0.0.0/32 is subnetted, 2 subnets
O 3.3.3.3 [110/3] via 192.168.15.5, 00:01:35, FastEthernet1/0
[110/3] via 192.168.12.2, 00:01:35, FastEthernet0/0
O 3.3.3.33 [110/3] via 192.168.15.5, 00:01:35, FastEthernet1/0
[110/3] via 192.168.12.2, 00:01:35, FastEthernet0/0
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/2] via 192.168.14.4, 00:01:35, FastEthernet0/1
O 192.168.24.0/24 [110/2] via 192.168.14.4, 00:01:36, FastEthernet0/1
[110/2] via 192.168.12.2, 00:01:36, FastEthernet0/0
5.0.0.0/32 is subnetted, 1 subnets
O 5.5.5.5 [110/2] via 192.168.15.5, 00:01:35, FastEthernet1/0
O 192.168.23.0/24 [110/2] via 192.168.12.2, 00:01:36, FastEthernet0/0
O 192.168.34.0/24 [110/3] via 192.168.15.5, 00:01:36, FastEthernet1/0
[110/3] via 192.168.12.2, 00:01:36, FastEthernet0/0
O 192.168.35.0/24 [110/2] via 192.168.15.5, 00:01:37, FastEthernet1/0
-If for some reason we need to forwarding down the traffic only to 3.3.3.3/32 through tunnel 1, so we need to add the static route to 3.3.3.3/32 point to tunnel 1.
R1#show run | in ip route
ip route 3.3.3.3 255.255.255.255 Tunnel1
R1#show ip route static
S 3.3.3.3 is directly connected, Tunnel1
R1#traceroute 3.3.3.3
1 192.168.14.4 [MPLS: Label 20 Exp 0] 28 msec 40 msec 12 msec
2 192.168.24.2 20 msec 20 msec 8 msec
3 192.168.23.3 28 msec * 28 msec
-Forwarding to 3.3.3.33/32 is now load-balancing between R2 and R5.
R1#traceroute 3.3.3.33
1 192.168.15.5 28 msec
192.168.12.2 [MPLS: Label 24 Exp 0] 12 msec
192.168.15.5 36 msec
2 192.168.23.3 20 msec
192.168.35.3 40 msec *
Note: Before proceeding to read the latter part, think a while what will happen if the link between R2 and R3 failed. And the topology will become shown below.
-The traffic to 3.3.3.3/32 will endlessly loop between R1,R4, and R2 until the packet ttl expired.
But forwarding to 3.3.3.33 will still be taking the path R1>R5>R3
R1#traceroute 3.3.3.3
1 192.168.14.4 [MPLS: Label 20 Exp 0] 48 msec 36 msec 28 msec
2 192.168.24.2 24 msec 24 msec 32 msec
3 192.168.12.1 [MPLS: Label 21 Exp 0] 56 msec 56 msec 72 msec
4 192.168.14.4 [MPLS: Label 20 Exp 0] 64 msec 64 msec 56 msec
5 192.168.24.2 60 msec 60 msec 64 msec
6 192.168.12.1 [MPLS: Label 21 Exp 0] 100 msec 92 msec 112 msec
7 192.168.14.4 [MPLS: Label 20 Exp 0] 128 msec 132 msec 108 msec
8 192.168.24.2 88 msec 96 msec 92 msec
9 192.168.12.1 [MPLS: Label 21 Exp 0] 108 msec 124 msec 132 msec
10 192.168.14.4 [MPLS: Label 20 Exp 0] 116 msec 120 msec 136 msec
11 192.168.24.2 128 msec 116 msec 108 msec
12 192.168.12.1 [MPLS: Label 21 Exp 0] 100 msec 140 msec
R1#ping 3.3.3.3
.....
Success rate is 0 percent (0/5)
R1#ping 3.3.3.33
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/26/32 ms
R1#traceroute 3.3.3.33
1 192.168.15.5 48 msec 4 msec 8 msec
2 192.168.35.3 16 msec * 40 msec
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