Don’t advertise Sham link end point into OSPF
R3#sh ip ospf
sham-links
Sham
Link OSPF_SL1 to address 111.11.11.11 is up
Area 1 source address 33.33.33.33
Run as demand
circuit
DoNotAge LSA
allowed. Cost of using 1 State POINT_TO_POINT,
Timer intervals
configured, Hello 10, Dead 40, Wait 40,
Hello due in
00:00:02
R1#sh ip ospf sham-links
Sham Link OSPF_SL1 to address 33.33.33.33 is up
Area 1 source address 111.11.11.11
Run as demand circuit
DoNotAge LSA allowed. Cost of using 1 State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40,
Hello due in 00:00:06
Adjacency State FULL (Hello suppressed)
********************************************************8
*************************************
R6#sh ip route
R6#traceroute 4.4.4.4
Sham Link OSPF_SL1 to address 33.33.33.33 is up
Area 1 source address 111.11.11.11
Run as demand circuit
DoNotAge LSA allowed. Cost of using 1 State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40,
Hello due in 00:00:06
Adjacency State FULL (Hello suppressed)
********************************************************8
*************************************
******R6***
interface FastEthernet0/0
ip address
46.0.0.6 255.255.255.0
ip ospf cost 100
duplex auto
speed auto
***R4***
interface FastEthernet0/0
ip address
46.0.0.4 255.255.255.0
ip ospf cost 100
duplex auto
speed auto
R1#sh ip route vrf B ospf
Gateway of last resort is not set
4.0.0.0/32 is
subnetted, 1 subnets
O 4.4.4.4
[110/2] via 10.0.0.4, 00:13:19, FastEthernet0/1
6.0.0.0/32 is
subnetted, 1 subnets
O 6.6.6.6
[110/3] via 3.3.3.3, 00:13:19
11.0.0.0/24
is subnetted, 1 subnets
O 11.0.0.0
[110/2] via 3.3.3.3, 00:13:19
46.0.0.0/24
is subnetted, 1 subnets
O 46.0.0.0
[110/101] via 10.0.0.4, 00:13:19, FastEthernet0/1
R1#
R4#sh ip route ospf
6.0.0.0/32 is
subnetted, 1 subnets
O 6.6.6.6
[110/4] via 10.0.0.1, 00:14:02, FastEthernet0/1
11.0.0.0/24
is subnetted, 1 subnets
O 11.0.0.0
[110/3] via 10.0.0.1, 00:14:02, FastEthernet0/1
33.0.0.0/32
is subnetted, 1 subnets
O E2
33.33.33.33 [110/1] via 10.0.0.1, 00:14:02, FastEthernet0/1
111.0.0.0/32
is subnetted, 1 subnets
O E2
111.11.11.11 [110/1] via 10.0.0.1, 00:14:02, FastEthernet0/1
R4#
Gateway of last resort is not set
4.0.0.0/32 is subnetted, 1 subnets
O 4.4.4.4 [110/4] via 11.0.0.3, 00:20:52, FastEthernet0/1
>>>> prefix coming from R3 MPLS cloud , not from Backdoor link R4.
6.0.0.0/32 is subnetted, 1 subnets
C 6.6.6.6 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 1 subnets
O 10.0.0.0 [110/3] via 11.0.0.3, 00:20:52, FastEthernet0/1
11.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
Type escape sequence to abort.
Tracing the route to 4.4.4.4
VRF info: (vrf in name/id, vrf out name/id)
1 11.0.0.3 260 msec 224 msec 244 msec
2 172.16.0.2 [MPLS: Labels 17/25 Exp 0] 324 msec 112 msec 136 msec
3 10.0.0.1 [MPLS: Label 25 Exp 0] 112 msec 144 msec 112 msec
4 10.0.0.4 168 msec 216 msec 188 msec
R6#
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