VIRTUAL LINK CONTINUED
Friday, November 14, 2008
before configuring virtual links let me give the ospf proc for routers to determine the router id's and additional details
CODE
r2(config-router)#do sio
Routing Process "ospf 1" with ID 10.1.2.1
Start time: 00:00:14.260, Time elapsed: 00:33:39.676
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border router
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 1. Checksum Sum 0x005F69
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Number of areas transit capable is 1
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:03:31.192 ago
SPF algorithm executed 7 times
Area ranges are
Number of LSA 10. Checksum Sum 0x056D2C
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 5
Flood list length 0
Area 23
Number of interfaces in this area is 2
This area has transit capability: Virtual Link Endpoint
Area has no authentication
SPF algorithm last executed 00:03:31.216 ago
SPF algorithm executed 9 times
Area ranges are
Number of LSA 8. Checksum Sum 0x032600
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
r2(config-router)#
--------------------------------------------------------------------------------------------------
r3#sio
Routing Process "ospf 1" with ID 192.168.103.1
Start time: 00:00:14.616, Time elapsed: 00:34:24.904
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border router
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 1. Checksum Sum 0x005D6A
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 3. 3 normal 0 stub 0 nssa
Number of areas transit capable is 1
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 00:04:17.788 ago
SPF algorithm executed 3 times
Area ranges are
Number of LSA 10. Checksum Sum 0x057329
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 5
Flood list length 0
Area 23
Number of interfaces in this area is 2 (1 loopback)
This area has transit capability: Virtual Link Endpoint
Area has no authentication
SPF algorithm last executed 00:04:17.796 ago
SPF algorithm executed 12 times
Area ranges are
Number of LSA 8. Checksum Sum 0x032600
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 100
Number of interfaces in this area is 4
Area has no authentication
SPF algorithm last executed 00:04:28.540 ago
SPF algorithm executed 16 times
Area ranges are
192.168.100.0/22 Active(1) Advertise
Number of LSA 8. Checksum Sum 0x03A39D
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
r3#
Routing Process "ospf 1" with ID 10.1.2.1
Start time: 00:00:14.260, Time elapsed: 00:33:39.676
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border router
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 1. Checksum Sum 0x005F69
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
Number of areas transit capable is 1
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:03:31.192 ago
SPF algorithm executed 7 times
Area ranges are
Number of LSA 10. Checksum Sum 0x056D2C
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 5
Flood list length 0
Area 23
Number of interfaces in this area is 2
This area has transit capability: Virtual Link Endpoint
Area has no authentication
SPF algorithm last executed 00:03:31.216 ago
SPF algorithm executed 9 times
Area ranges are
Number of LSA 8. Checksum Sum 0x032600
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
r2(config-router)#
--------------------------------------------------------------------------------------------------
r3#sio
Routing Process "ospf 1" with ID 192.168.103.1
Start time: 00:00:14.616, Time elapsed: 00:34:24.904
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an area border router
Router is not originating router-LSAs with maximum metric
Initial SPF schedule delay 5000 msecs
Minimum hold time between two consecutive SPFs 10000 msecs
Maximum wait time between two consecutive SPFs 10000 msecs
Incremental-SPF disabled
Minimum LSA interval 5 secs
Minimum LSA arrival 1000 msecs
LSA group pacing timer 240 secs
Interface flood pacing timer 33 msecs
Retransmission pacing timer 66 msecs
Number of external LSA 1. Checksum Sum 0x005D6A
Number of opaque AS LSA 0. Checksum Sum 0x000000
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 3. 3 normal 0 stub 0 nssa
Number of areas transit capable is 1
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 00:04:17.788 ago
SPF algorithm executed 3 times
Area ranges are
Number of LSA 10. Checksum Sum 0x057329
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 5
Flood list length 0
Area 23
Number of interfaces in this area is 2 (1 loopback)
This area has transit capability: Virtual Link Endpoint
Area has no authentication
SPF algorithm last executed 00:04:17.796 ago
SPF algorithm executed 12 times
Area ranges are
Number of LSA 8. Checksum Sum 0x032600
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 100
Number of interfaces in this area is 4
Area has no authentication
SPF algorithm last executed 00:04:28.540 ago
SPF algorithm executed 16 times
Area ranges are
192.168.100.0/22 Active(1) Advertise
Number of LSA 8. Checksum Sum 0x03A39D
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
r3#
CREATING THE LINK
CODE
r2(config-router)#area 23 virtual-link ?
A.B.C.D ID (IP addr) associated with virtual link neighbor
r2(config-router)#area 23 virtual-link 192.168.103.1
r2(config-router)#
r3(config-router)#area 23 virtual-link 10.1.2.1
r3(config-router)#end
*Mar 1 00:30:13.799: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.103.1 on OSPF_VL1 from LOADING to FULL, Loading Done ----- term msgs
*Mar 1 00:30:13.507: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on OSPF_VL1 from LOADING to FULL, Loading Done
A.B.C.D ID (IP addr) associated with virtual link neighbor
r2(config-router)#area 23 virtual-link 192.168.103.1
r2(config-router)#
r3(config-router)#area 23 virtual-link 10.1.2.1
r3(config-router)#end
*Mar 1 00:30:13.799: %OSPF-5-ADJCHG: Process 1, Nbr 192.168.103.1 on OSPF_VL1 from LOADING to FULL, Loading Done ----- term msgs
*Mar 1 00:30:13.507: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.2.1 on OSPF_VL1 from LOADING to FULL, Loading Done
lets go down and see r2 and r1 table for 192 network
CODE
as#2
[Resuming connection 2 to r2 ... ]
r2(config-router)#do sir
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 10.1.12.1 to network 0.0.0.0
172.30.0.0/32 is subnetted, 1 subnets
O 172.30.30.1 [110/65] via 10.1.12.1, 00:05:40, Serial2/0
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.1.12.0/24 is directly connected, Serial2/0
O 10.1.3.1/32 [110/65] via 10.1.23.2, 00:05:40, Serial2/1
C 10.1.2.0/24 is directly connected, Loopback2
O 10.1.1.1/32 [110/65] via 10.1.12.1, 00:05:40, Serial2/0
C 10.1.23.0/24 is directly connected, Serial2/1
O*E2 0.0.0.0/0 [110/1] via 10.1.12.1, 00:05:40, Serial2/0
O IA 192.168.100.0/22 [110/65] via 10.1.23.2, 00:05:40, Serial2/1
r2(config-router)#
as#1
[Resuming connection 1 to r1 ... ]
r1#do sir
^
% Invalid input detected at '^' marker.
r1#sir
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
172.30.0.0/30 is subnetted, 1 subnets
C 172.30.30.0 is directly connected, Loopback30
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.1.12.0/24 is directly connected, Serial2/0
O IA 10.1.3.1/32 [110/129] via 10.1.12.2, 00:05:52, Serial2/0
O IA 10.1.2.0/24 [110/65] via 10.1.12.2, 00:05:52, Serial2/0
C 10.1.1.0/24 is directly connected, Loopback1
O IA 10.1.23.0/24 [110/128] via 10.1.12.2, 00:05:52, Serial2/0
O IA 192.168.100.0/22 [110/129] via 10.1.12.2, 00:05:52, Serial2/0
r1#
[Resuming connection 2 to r2 ... ]
r2(config-router)#do sir
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 10.1.12.1 to network 0.0.0.0
172.30.0.0/32 is subnetted, 1 subnets
O 172.30.30.1 [110/65] via 10.1.12.1, 00:05:40, Serial2/0
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.1.12.0/24 is directly connected, Serial2/0
O 10.1.3.1/32 [110/65] via 10.1.23.2, 00:05:40, Serial2/1
C 10.1.2.0/24 is directly connected, Loopback2
O 10.1.1.1/32 [110/65] via 10.1.12.1, 00:05:40, Serial2/0
C 10.1.23.0/24 is directly connected, Serial2/1
O*E2 0.0.0.0/0 [110/1] via 10.1.12.1, 00:05:40, Serial2/0
O IA 192.168.100.0/22 [110/65] via 10.1.23.2, 00:05:40, Serial2/1
r2(config-router)#
as#1
[Resuming connection 1 to r1 ... ]
r1#do sir
^
% Invalid input detected at '^' marker.
r1#sir
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
172.30.0.0/30 is subnetted, 1 subnets
C 172.30.30.0 is directly connected, Loopback30
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
C 10.1.12.0/24 is directly connected, Serial2/0
O IA 10.1.3.1/32 [110/129] via 10.1.12.2, 00:05:52, Serial2/0
O IA 10.1.2.0/24 [110/65] via 10.1.12.2, 00:05:52, Serial2/0
C 10.1.1.0/24 is directly connected, Loopback1
O IA 10.1.23.0/24 [110/128] via 10.1.12.2, 00:05:52, Serial2/0
O IA 192.168.100.0/22 [110/129] via 10.1.12.2, 00:05:52, Serial2/0
r1#
VERIFICATION OF VIRTUAL LINK
CODE
r1#sio vi
r1#show ip ospf virtual-links ------------------> dont get confused here r1 dosent have any virtual links configured under proc ospf ...
r1#
as#2
[Resuming connection 2 to r2 ... ]
r2#
*Mar 1 00:37:00.543: %SYS-5-CONFIG_I: Configured from console by console
r2#sio vi
r2#show ip ospf virtual-links
Virtual Link OSPF_VL1 to router 192.168.103.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 23, via interface Serial2/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:00
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
r2#
as#3
[Resuming connection 3 to r3 ... ]
r3#sio vi
r3#show ip ospf virtual-links
Virtual Link OSPF_VL1 to router 10.1.2.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 23, via interface Serial2/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:08
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
r3#
r1#show ip ospf virtual-links ------------------> dont get confused here r1 dosent have any virtual links configured under proc ospf ...
r1#
as#2
[Resuming connection 2 to r2 ... ]
r2#
*Mar 1 00:37:00.543: %SYS-5-CONFIG_I: Configured from console by console
r2#sio vi
r2#show ip ospf virtual-links
Virtual Link OSPF_VL1 to router 192.168.103.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 23, via interface Serial2/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:00
Adjacency State FULL (Hello suppressed)
Index 2/3, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
r2#
as#3
[Resuming connection 3 to r3 ... ]
r3#sio vi
r3#show ip ospf virtual-links
Virtual Link OSPF_VL1 to router 10.1.2.1 is up
Run as demand circuit
DoNotAge LSA allowed.
Transit area 23, via interface Serial2/1, Cost of using 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:08
Adjacency State FULL (Hello suppressed)
Index 1/2, retransmission queue length 0, number of retransmission 0
First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
Last retransmission scan length is 0, maximum is 0
Last retransmission scan time is 0 msec, maximum is 0 msec
r3#