NOW INTO THE TOPO
Friday, November 14, 2008
Starting out with configs ... every thing is straigh foreward .. just remember one thing .. loopback 20 on router 3 is not advertised into ospf ... this is done specificially as later it will be used for tpye 7 lsa using redistribute connected subnets command to generate type 7 lsa's more on that later ..
without any altered configs .. this is how the two area of ospf look's like
CODE
as#1
[Resuming connection 1 to r1 ... ]
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
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.12.0 is directly connected, Serial2/0
O IA 10.1.3.0 [110/129] via 10.1.12.2, 00:05:08, Serial2/0
O IA 10.1.2.0 [110/65] via 10.1.12.2, 00:05:18, Serial2/0
C 10.1.1.0 is directly connected, Loopback1
O IA 10.1.23.0 [110/128] via 10.1.12.2, 00:05:18, Serial2/0
r1#sio
Routing Process "ospf 1" with ID 10.1.1.1
Start time: 00:12:27.968, Time elapsed: 00:57:12.316
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
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 0. Checksum Sum 0x000000
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 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:05:22.392 ago
SPF algorithm executed 11 times
Area ranges are
Number of LSA 6. Checksum Sum 0x025F3A
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
r1#siod
OSPF Router with ID (10.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.1.1.1 10.1.1.1 1404 0x80000007 0x0050D9 3
10.1.2.1 10.1.2.1 329 0x80000007 0x007CC7 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.2.0 10.1.2.1 334 0x80000003 0x0074AA
10.1.3.0 10.1.2.1 314 0x80000001 0x00EFEF
10.1.23.0 10.1.2.1 334 0x80000003 0x0005C5
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.20.200.1 10.1.2.1 314 0x80000001 0x00273C
r1#
[Resuming connection 1 to r1 ... ]
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
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.12.0 is directly connected, Serial2/0
O IA 10.1.3.0 [110/129] via 10.1.12.2, 00:05:08, Serial2/0
O IA 10.1.2.0 [110/65] via 10.1.12.2, 00:05:18, Serial2/0
C 10.1.1.0 is directly connected, Loopback1
O IA 10.1.23.0 [110/128] via 10.1.12.2, 00:05:18, Serial2/0
r1#sio
Routing Process "ospf 1" with ID 10.1.1.1
Start time: 00:12:27.968, Time elapsed: 00:57:12.316
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
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 0. Checksum Sum 0x000000
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 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:05:22.392 ago
SPF algorithm executed 11 times
Area ranges are
Number of LSA 6. Checksum Sum 0x025F3A
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
r1#siod
OSPF Router with ID (10.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.1.1.1 10.1.1.1 1404 0x80000007 0x0050D9 3
10.1.2.1 10.1.2.1 329 0x80000007 0x007CC7 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.2.0 10.1.2.1 334 0x80000003 0x0074AA
10.1.3.0 10.1.2.1 314 0x80000001 0x00EFEF
10.1.23.0 10.1.2.1 334 0x80000003 0x0005C5
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.20.200.1 10.1.2.1 314 0x80000001 0x00273C
r1#
CODE
r2#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
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.12.0 is directly connected, Serial2/0
O 10.1.3.0 [110/65] via 10.1.23.2, 00:05:48, Serial2/1
C 10.1.2.0 is directly connected, Loopback2
O 10.1.1.0 [110/65] via 10.1.12.1, 00:05:58, Serial2/0
C 10.1.23.0 is directly connected, Serial2/1
r2#sio
Routing Process "ospf 1" with ID 10.1.2.1
Start time: 00:13:30.596, Time elapsed: 00:56:55.916
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 0. Checksum Sum 0x000000
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 0
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 00:06:01.244 ago
SPF algorithm executed 10 times
Area ranges are
Number of LSA 6. Checksum Sum 0x02B610
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 23
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:05:51.240 ago
SPF algorithm executed 14 times
Area ranges are
Number of LSA 4. Checksum Sum 0x01EC8A
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
r2#siod
OSPF Router with ID (10.1.2.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.1.1.1 10.1.1.1 1445 0x80000007 0x0050D9 3
10.1.2.1 10.1.2.1 369 0x80000007 0x007CC7 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.2.0 10.1.2.1 373 0x80000003 0x0074AA
10.1.3.0 10.1.2.1 354 0x80000001 0x00EFEF
10.1.23.0 10.1.2.1 373 0x80000003 0x0005C5
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.20.200.1 10.1.2.1 354 0x80000001 0x00273C
Router Link States (Area 23)
Link ID ADV Router Age Seq# Checksum Link count
10.1.2.1 10.1.2.1 361 0x80000008 0x004C46 3
172.20.200.1 172.20.200.1 363 0x80000009 0x007B96 3
Summary Net Link States (Area 23)
Link ID ADV Router Age Seq# Checksum
10.1.1.0 10.1.2.1 370 0x80000001 0x0006DB
10.1.12.0 10.1.2.1 370 0x80000001 0x008255
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
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.12.0 is directly connected, Serial2/0
O 10.1.3.0 [110/65] via 10.1.23.2, 00:05:48, Serial2/1
C 10.1.2.0 is directly connected, Loopback2
O 10.1.1.0 [110/65] via 10.1.12.1, 00:05:58, Serial2/0
C 10.1.23.0 is directly connected, Serial2/1
r2#sio
Routing Process "ospf 1" with ID 10.1.2.1
Start time: 00:13:30.596, Time elapsed: 00:56:55.916
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 0. Checksum Sum 0x000000
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 0
External flood list length 0
Area BACKBONE(0)
Number of interfaces in this area is 1
Area has no authentication
SPF algorithm last executed 00:06:01.244 ago
SPF algorithm executed 10 times
Area ranges are
Number of LSA 6. Checksum Sum 0x02B610
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 23
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:05:51.240 ago
SPF algorithm executed 14 times
Area ranges are
Number of LSA 4. Checksum Sum 0x01EC8A
Number of opaque link LSA 0. Checksum Sum 0x000000
Number of DCbitless LSA 0
Number of indication LSA 0
r2#siod
OSPF Router with ID (10.1.2.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.1.1.1 10.1.1.1 1445 0x80000007 0x0050D9 3
10.1.2.1 10.1.2.1 369 0x80000007 0x007CC7 2
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.1.2.0 10.1.2.1 373 0x80000003 0x0074AA
10.1.3.0 10.1.2.1 354 0x80000001 0x00EFEF
10.1.23.0 10.1.2.1 373 0x80000003 0x0005C5
Summary ASB Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.20.200.1 10.1.2.1 354 0x80000001 0x00273C
Router Link States (Area 23)
Link ID ADV Router Age Seq# Checksum Link count
10.1.2.1 10.1.2.1 361 0x80000008 0x004C46 3
172.20.200.1 172.20.200.1 363 0x80000009 0x007B96 3
Summary Net Link States (Area 23)
Link ID ADV Router Age Seq# Checksum
10.1.1.0 10.1.2.1 370 0x80000001 0x0006DB
10.1.12.0 10.1.2.1 370 0x80000001 0x008255
r2#
CODE
r3#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
172.20.0.0/24 is subnetted, 1 subnets
C 172.20.200.0 is directly connected, Loopback20
10.0.0.0/24 is subnetted, 5 subnets
O IA 10.1.12.0 [110/128] via 10.1.23.1, 00:06:23, Serial2/1
C 10.1.3.0 is directly connected, Loopback3
O 10.1.2.0 [110/65] via 10.1.23.1, 00:06:23, Serial2/1
O IA 10.1.1.0 [110/129] via 10.1.23.1, 00:06:23, Serial2/1
C 10.1.23.0 is directly connected, Serial2/1
r3#sio
Routing Process "ospf 1" with ID 172.20.200.1
Start time: 00:16:01.652, Time elapsed: 00:55:00.352
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an autonomous system boundary router
Redistributing External Routes from,
connected
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 0. Checksum Sum 0x000000
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 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area 23
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:06:26.508 ago
SPF algorithm executed 11 times
Area ranges are
Number of LSA 4. Checksum Sum 0x02BE21
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#siod
OSPF Router with ID (172.20.200.1) (Process ID 1)
Router Link States (Area 23)
Link ID ADV Router Age Seq# Checksum Link count
10.1.2.1 10.1.2.1 394 0x80000008 0x004C46 3
172.20.200.1 172.20.200.1 393 0x80000009 0x007B96 3
Summary Net Link States (Area 23)
Link ID ADV Router Age Seq# Checksum
10.1.1.0 10.1.2.1 402 0x80000001 0x0006DB
10.1.12.0 10.1.2.1 402 0x80000001 0x008255
r3#
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
172.20.0.0/24 is subnetted, 1 subnets
C 172.20.200.0 is directly connected, Loopback20
10.0.0.0/24 is subnetted, 5 subnets
O IA 10.1.12.0 [110/128] via 10.1.23.1, 00:06:23, Serial2/1
C 10.1.3.0 is directly connected, Loopback3
O 10.1.2.0 [110/65] via 10.1.23.1, 00:06:23, Serial2/1
O IA 10.1.1.0 [110/129] via 10.1.23.1, 00:06:23, Serial2/1
C 10.1.23.0 is directly connected, Serial2/1
r3#sio
Routing Process "ospf 1" with ID 172.20.200.1
Start time: 00:16:01.652, Time elapsed: 00:55:00.352
Supports only single TOS(TOS0) routes
Supports opaque LSA
Supports Link-local Signaling (LLS)
Supports area transit capability
It is an autonomous system boundary router
Redistributing External Routes from,
connected
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 0. Checksum Sum 0x000000
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 1. 1 normal 0 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area 23
Number of interfaces in this area is 2
Area has no authentication
SPF algorithm last executed 00:06:26.508 ago
SPF algorithm executed 11 times
Area ranges are
Number of LSA 4. Checksum Sum 0x02BE21
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#siod
OSPF Router with ID (172.20.200.1) (Process ID 1)
Router Link States (Area 23)
Link ID ADV Router Age Seq# Checksum Link count
10.1.2.1 10.1.2.1 394 0x80000008 0x004C46 3
172.20.200.1 172.20.200.1 393 0x80000009 0x007B96 3
Summary Net Link States (Area 23)
Link ID ADV Router Age Seq# Checksum
10.1.1.0 10.1.2.1 402 0x80000001 0x0006DB
10.1.12.0 10.1.2.1 402 0x80000001 0x008255
r3#
as you can see everything is straight foreward and no issues ...next to follow up with stub area