Дибров М.В., Кузьменко Н.Г., Журавлев А.А. Маршрутизаторы
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10.93.2.0 10.95.1.2 209 0x80000006 0x00FC68
10.95.0.1 10.95.1.2 897 0x80000001 0x001C17
10.95.2.0 10.95.1.2 214 0x80000001 0x00540D
172.16.0.0 10.95.1.2 244 0x80000002 0x0082C5
Summary ASB Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
10.95.0.1 10.95.1.2 899 0x80000001 0x00042F
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
192.168.0.0 10.95.0.1 1038 0x80000001 0x001CC3 0
В таблицах топологии на всех маршрутизаторах стенда находятся LSA
всех типов.
Шаг 2
Посмотрите таблицу маршрутизации на маршрутизаторах стенда.
r1#show ip route
.. .. ..
172.16.0.0/28 is subnetted, 3 subnets
O 172.16.0.32 [110/60] via 172.16.0.18, 00:04:55, Serial0/0/1
[110/60] via 172.16.0.2, 00:04:55, Serial0/0/0
C 172.16.0.16 is directly connected, Serial0/0/1
C 172.16.0.0 is directly connected, Serial0/0/0
10.0.0.0/8 is variably subnetted, 8 subnets, 5 masks
O IA 10.89.2.0/25 [110/101] via 172.16.0.18, 00:04:55, Serial0/0/1
O IA 10.89.1.0/25 [110/101] via 172.16.0.2, 00:04:55, Serial0/0/0
C 10.89.0.0/28 is directly connected, FastEthernet0/1.801
O IA 10.95.1.0/29 [110/51] via 172.16.0.2, 00:04:56, Serial0/0/0
C 10.95.0.1/32 is directly connected, Loopback0
O IA 10.93.2.0/26 [110/100] via 172.16.0.18, 00:04:56, Serial0/0/1
O IA 10.93.1.0/26 [110/100] via 172.16.0.2, 00:04:56, Serial0/0/0
O IA 10.95.2.0/29 [110/51] via 172.16.0.18, 00:04:57, Serial0/0/1
C 192.168.0.0/24 is directly connected, FastEthernet0/0
r2#show ip route
.. .. ..
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 172.16.0.32/28 is directly connected, FastEthernet0/0
O 172.16.0.16/28 [110/60] via 172.16.0.34, 00:05:34, FastEthernet0/0
C 172.16.0.0/28 is directly connected, Serial0/0/0
O 172.16.0.0/26 is a summary, 00:05:34, Null0
10.0.0.0/8 is variably subnetted, 22 subnets, 5 masks
O 10.89.1.80/28 [110/51] via 10.93.1.18, 00:06:13, Serial0/1/0
O 10.89.1.64/28 [110/51] via 10.93.1.18, 00:06:13, Serial0/1/0
O 10.89.1.112/28 [110/51] via 10.93.1.18, 00:06:14, Serial0/1/0
O 10.89.1.96/28 [110/51] via 10.93.1.18, 00:06:14, Serial0/1/0
O 10.89.1.16/28 [110/51] via 10.93.1.2, 00:06:14, Serial0/0/1
C 10.93.1.16/28 is directly connected, Serial0/1/0
O 10.95.1.4/32 [110/51] via 10.93.1.2, 00:06:14, Serial0/0/1
O 10.95.1.5/32 [110/51] via 10.93.1.18, 00:06:15, Serial0/1/0
O IA 10.89.2.0/25 [110/61] via 172.16.0.34, 00:05:35, FastEthernet0/0
O 10.89.1.0/28 [110/51] via 10.93.1.2, 00:06:15, Serial0/0/1
O 10.89.1.0/25 is a summary, 00:06:15, Null0
O 10.89.0.0/28 [110/51] via 172.16.0.1, 00:05:35, Serial0/0/0
O 10.95.1.0/29 is a summary, 00:06:15, Null0
O 10.95.0.1/32 [110/51] via 172.16.0.1, 00:05:35, Serial0/0/0
91
O IA 10.93.2.0/26 [110/60] via 172.16.0.34, 00:05:35, FastEthernet0/0
C 10.95.1.2/32 is directly connected, Loopback0
C 10.93.1.0/28 is directly connected, Serial0/0/1
O 10.93.1.0/26 is a summary, 00:06:15, Null0
O IA 10.95.2.0/29 [110/11] via 172.16.0.34, 00:05:35, FastEthernet0/0
O 10.89.1.48/28 [110/51] via 10.93.1.2, 00:06:15, Serial0/0/1
O 10.89.1.32/28 [110/51] via 10.93.1.2, 00:06:15, Serial0/0/1
O 10.93.1.32/28 [110/51] via 10.93.1.18, 00:06:16, Serial0/1/0
[110/51] via 10.93.1.2, 00:06:16, Serial0/0/1
O E2 192.168.0.0/24 [110/1] via 172.16.0.1, 00:05:36, Serial0/0/0
r4#show ip route
.. .. ..
172.16.0.0/26 is subnetted, 1 subnets
O IA 172.16.0.0 [110/60] via 10.93.1.1, 00:06:52, Serial0/0/0
10.0.0.0/8 is variably subnetted, 19 subnets, 5 masks
O 10.89.1.80/28 [110/2] via 10.93.1.34, 00:06:52, FastEthernet0/0
O 10.89.1.64/28 [110/2] via 10.93.1.34, 00:06:52, FastEthernet0/0
O 10.89.1.112/28 [110/2] via 10.93.1.34, 00:06:52, FastEthernet0/0
O 10.89.1.96/28 [110/2] via 10.93.1.34, 00:06:52, FastEthernet0/0
C 10.89.1.16/28 is directly connected, FastEthernet0/1.812
O 10.93.1.16/28 [110/51] via 10.93.1.34, 00:06:53, FastEthernet0/0
C 10.95.1.4/32 is directly connected, Loopback0
O 10.95.1.5/32 [110/2] via 10.93.1.34, 00:06:53, FastEthernet0/0
O IA 10.89.2.0/25 [110/111] via 10.93.1.1, 00:06:29, Serial0/0/0
C 10.89.1.0/28 is directly connected, FastEthernet0/1.811
O IA 10.89.0.0/28 [110/101] via 10.93.1.1, 00:06:54, Serial0/0/0
O IA 10.95.0.1/32 [110/101] via 10.93.1.1, 00:06:54, Serial0/0/0
O IA 10.93.2.0/26 [110/110] via 10.93.1.1, 00:06:24, Serial0/0/0
O 10.95.1.2/32 [110/51] via 10.93.1.1, 00:06:54, Serial0/0/0
C 10.93.1.0/28 is directly connected, Serial0/0/0
O IA 10.95.2.0/29 [110/61] via 10.93.1.1, 00:06:29, Serial0/0/0
C 10.89.1.48/28 is directly connected, FastEthernet0/1.814
C 10.89.1.32/28 is directly connected, FastEthernet0/1.813
C 10.93.1.32/28 is directly connected, FastEthernet0/0
O E2 192.168.0.0/24 [110/1] via 10.93.1.1, 00:06:14, Serial0/0/0
В таблицах маршрутизации всех маршрутизаторов стенда
присутствуют все типы маршрутов OSPF.
Задание 2. Настройка стандартных зон OSPF как тупиковых зон.
В этом задании необходимо настроить стандартные зоны 1 и 2 протокола
OSPF как тупиковые зоны и изучить влияние подобной настройки на процесс
распространения топологической информации в домене маршрутизации OSPF.
Шаг 1
Настройте зоны 1 и 2 как тупиковые зоны протокола OSPF.
Шаг 2
Убедитесь, что зоны 1 и 2 участвуют в процессе маршрутизации OSPF
как тупиковые зоны.
92
r2#show ip ospf
Routing Process "ospf 1" with ID 10.95.1.2
Start time: 00:47:29.008, Time elapsed: 01:05:18.876
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 0x0018C5
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. 1 normal 1 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 00:08:58.532 ago
SPF algorithm executed 14 times
Area ranges are
172.16.0.0/26 Active(10) Advertise
Number of LSA 10. Checksum Sum 0x05FC3C
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 1
Number of interfaces in this area is 3 (1 loopback)
It is a stub area
generates stub default route with cost 1
Area has no authentication
SPF algorithm last executed 00:08:58.532 ago
SPF algorithm executed 15 times
Area ranges are
10.89.1.0/25 Active(51) Advertise
10.93.1.0/26 Active(50) Advertise
10.95.1.0/29 Active(1) Advertise
Number of LSA 5. Checksum Sum 0x027626
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
93
r4#show ip ospf
Routing Process "ospf 1" with ID 10.95.1.4
Start time: 00:48:05.484, Time elapsed: 01:03:02.596
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. 0 normal 1 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area 1
Number of interfaces in this area is 7 (1 loopback)
It is a stub area
Area has no authentication
SPF algorithm last executed 00:42:53.060 ago
SPF algorithm executed 8 times
Area ranges are
Number of LSA 5. Checksum Sum 0x027626
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
Шаг 3
Посмотрите таблицу топологии на маршрутизаторах стенда.
r1#show ip ospf database
OSPF Router with ID (10.95.0.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.95.0.1 10.95.0.1 1212 0x80000004 0x009819 6
10.95.1.2 10.95.1.2 629 0x80000006 0x0064D1 3
10.95.2.3 10.95.2.3 639 0x80000005 0x00AC65 3
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.16.0.33 10.95.1.2 639 0x80000001 0x00958E
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.89.1.0 10.95.1.2 84 0x80000001 0x006652
94
10.89.2.0 10.95.2.3 24 0x80000001 0x004E67
10.93.1.0 10.95.1.2 669 0x80000002 0x00ABC8
10.93.2.0 10.95.2.3 640 0x80000002 0x0093DD
10.95.1.0 10.95.1.2 669 0x80000001 0x00FA71
10.95.2.0 10.95.2.3 640 0x80000001 0x00E286
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
192.168.0.0 10.95.0.1 1462 0x80000001 0x001CC3 0
r2#show ip ospf database
OSPF Router with ID (10.95.1.2) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
10.95.0.1 10.95.0.1 1243 0x80000004 0x009819 6
10.95.1.2 10.95.1.2 659 0x80000006 0x0064D1 3
10.95.2.3 10.95.2.3 670 0x80000005 0x00AC65 3
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
172.16.0.33 10.95.1.2 669 0x80000001 0x00958E
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
10.89.1.0 10.95.1.2 114 0x80000001 0x006652
10.89.2.0 10.95.2.3 55 0x80000001 0x004E67
10.93.1.0 10.95.1.2 699 0x80000002 0x00ABC8
10.93.2.0 10.95.2.3 670 0x80000002 0x0093DD
10.95.1.0 10.95.1.2 699 0x80000001 0x00FA71
10.95.2.0 10.95.2.3 670 0x80000001 0x00E286
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
10.95.1.2 10.95.1.2 110 0x80000007 0x00A7B7 5
10.95.1.4 10.95.1.4 110 0x80000006 0x004FC3 8
10.95.1.5 10.95.1.5 108 0x80000005 0x00F6F7 8
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
10.93.1.34 10.95.1.5 108 0x80000003 0x004A27
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 10.95.1.2 184 0x80000001 0x004988
10.89.0.0 10.95.1.2 184 0x80000002 0x00301A
10.89.2.0 10.95.1.2 55 0x80000001 0x00DDD1
10.93.2.0 10.95.1.2 184 0x80000007 0x00194D
10.95.0.1 10.95.1.2 184 0x80000002 0x0038FB
10.95.2.0 10.95.1.2 184 0x80000002 0x0070F1
172.16.0.0 10.95.1.2 186 0x80000003 0x009EAA
Type-5 AS External Link States
Link ID ADV Router Age Seq# Checksum Tag
192.168.0.0 10.95.0.1 1495 0x80000001 0x001CC3 0
95
r4#show ip ospf database
OSPF Router with ID (10.95.1.4) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
10.95.1.2 10.95.1.2 145 0x80000007 0x00A7B7 5
10.95.1.4 10.95.1.4 144 0x80000006 0x004FC3 8
10.95.1.5 10.95.1.5 143 0x80000005 0x00F6F7 8
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
10.93.1.34 10.95.1.5 143 0x80000003 0x004A27
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 10.95.1.2 220 0x80000001 0x004988
10.89.0.0 10.95.1.2 220 0x80000002 0x00301A
10.89.2.0 10.95.1.2 91 0x80000001 0x00DDD1
10.93.2.0 10.95.1.2 220 0x80000007 0x00194D
10.95.0.1 10.95.1.2 220 0x80000002 0x0038FB
10.95.2.0 10.95.1.2 220 0x80000002 0x0070F1
172.16.0.0 10.95.1.2 221 0x80000003 0x009EAA
В тупиковую зону перестали распространяться внешние сообщения
LSA, они были заменены суммарным сообщением LSA, указывающим на
пограничный маршрутизатор тупиковой зоны.
Шаг 4
Посмотрите, как отразилось изменение таблиц топологии на таблицы
маршрутизации маршрутизаторов тупиковых зон.
r2#show ip route
.. .. ..
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 172.16.0.32/28 is directly connected, FastEthernet0/0
O 172.16.0.16/28 [110/60] via 172.16.0.34, 00:33:52, FastEthernet0/0
C 172.16.0.0/28 is directly connected, Serial0/0/0
O 172.16.0.0/26 is a summary, 00:33:52, Null0
10.0.0.0/8 is variably subnetted, 22 subnets, 5 masks
O 10.89.1.80/28 [110/51] via 10.93.1.18, 00:32:32, Serial0/1/0
O 10.89.1.64/28 [110/51] via 10.93.1.18, 00:32:32, Serial0/1/0
O 10.89.1.112/28 [110/51] via 10.93.1.18, 00:32:34, Serial0/1/0
O 10.89.1.96/28 [110/51] via 10.93.1.18, 00:32:34, Serial0/1/0
O 10.89.1.16/28 [110/51] via 10.93.1.2, 00:32:34, Serial0/0/1
C 10.93.1.16/28 is directly connected, Serial0/1/0
O 10.95.1.4/32 [110/51] via 10.93.1.2, 00:32:34, Serial0/0/1
O 10.95.1.5/32 [110/51] via 10.93.1.18, 00:32:34, Serial0/1/0
O IA 10.89.2.0/25 [110/61] via 172.16.0.34, 00:31:44, FastEthernet0/0
O 10.89.1.0/28 [110/51] via 10.93.1.2, 00:32:34, Serial0/0/1
O 10.89.1.0/25 is a summary, 00:32:34, Null0
O 10.89.0.0/28 [110/51] via 172.16.0.1, 00:33:53, Serial0/0/0
O 10.95.1.0/29 is a summary, 00:32:34, Null0
O 10.95.0.1/32 [110/51] via 172.16.0.1, 00:33:53, Serial0/0/0
O IA 10.93.2.0/26 [110/60] via 172.16.0.34, 00:32:34, FastEthernet0/0
96
C 10.95.1.2/32 is directly connected, Loopback0
C 10.93.1.0/28 is directly connected, Serial0/0/1
O 10.93.1.0/26 is a summary, 00:32:34, Null0
O IA 10.95.2.0/29 [110/11] via 172.16.0.34, 00:32:34, FastEthernet0/0
O 10.89.1.48/28 [110/51] via 10.93.1.2, 00:32:34, Serial0/0/1
O 10.89.1.32/28 [110/51] via 10.93.1.2, 00:32:34, Serial0/0/1
O 10.93.1.32/28 [110/51] via 10.93.1.18, 00:32:34, Serial0/1/0
[110/51] via 10.93.1.2, 00:32:35, Serial0/0/1
O E2 192.168.0.0/24 [110/1] via 172.16.0.1, 00:31:40, Serial0/0/0
r4#show ip route
.. .. ..
Gateway of last resort is 10.93.1.1 to network 0.0.0.0
172.16.0.0/26 is subnetted, 1 subnets
O IA 172.16.0.0 [110/60] via 10.93.1.1, 00:33:24, Serial0/0/0
10.0.0.0/8 is variably subnetted, 19 subnets, 5 masks
O 10.89.1.80/28 [110/2] via 10.93.1.34, 00:33:24, FastEthernet0/0
O 10.89.1.64/28 [110/2] via 10.93.1.34, 00:33:24, FastEthernet0/0
O 10.89.1.112/28 [110/2] via 10.93.1.34, 00:33:24, FastEthernet0/0
O 10.89.1.96/28 [110/2] via 10.93.1.34, 00:33:24, FastEthernet0/0
C 10.89.1.16/28 is directly connected, FastEthernet0/1.812
O 10.93.1.16/28 [110/51] via 10.93.1.34, 00:33:25, FastEthernet0/0
C 10.95.1.4/32 is directly connected, Loopback0
O 10.95.1.5/32 [110/2] via 10.93.1.34, 00:33:25, FastEthernet0/0
O IA 10.89.2.0/25 [110/111] via 10.93.1.1, 00:32:34, Serial0/0/0
C 10.89.1.0/28 is directly connected, FastEthernet0/1.811
O IA 10.89.0.0/28 [110/101] via 10.93.1.1, 00:33:27, Serial0/0/0
O IA 10.95.0.1/32 [110/101] via 10.93.1.1, 00:33:27, Serial0/0/0
O IA 10.93.2.0/26 [110/110] via 10.93.1.1, 00:33:27, Serial0/0/0
O 10.95.1.2/32 [110/51] via 10.93.1.1, 00:33:27, Serial0/0/0
C 10.93.1.0/28 is directly connected, Serial0/0/0
O IA 10.95.2.0/29 [110/61] via 10.93.1.1, 00:33:27, Serial0/0/0
C 10.89.1.48/28 is directly connected, FastEthernet0/1.814
C 10.89.1.32/28 is directly connected, FastEthernet0/1.813
C 10.93.1.32/28 is directly connected, FastEthernet0/0.311
O*IA 0.0.0.0/0 [110/51] via 10.93.1.1, 00:33:27, Serial0/0/0
В таблицах маршрутизации внутренних маршрутизаторов тупиковых зон
отсутствуют маршруты до внешних сетей получателей, такие маршруты были
заменены на маршрут по умолчанию до пограничного маршрутизатора
тупиковой зоны.
Задание 3. Настройка тупиковых зон как полностью тупиковых зон.
В этом задании необходимо настроить тупиковые зоны 1 и 2 как
полностью тупиковые зоны и изучить влияние подобной настройки на процесс
распространения топологической информации в домене маршрутизации OSPF.
Шаг 1
Настройте зоны 1 и 2 как полностью тупиковые зоны протокола OSPF.
Шаг 2
Убедитесь, что зоны 1 и 2 участвуют в процессе маршрутизации OSPF
как полностью тупиковые зоны.
97
r2#show ip ospf
Routing Process "ospf 1" with ID 10.95.1.2
Start time: 00:47:29.008, Time elapsed: 01:05:18.876
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 0x0018C5
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. 1 normal 1 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 00:08:58.532 ago
SPF algorithm executed 14 times
Area ranges are
172.16.0.0/26 Active(10) Advertise
Number of LSA 10. Checksum Sum 0x05FC3C
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 1
Number of interfaces in this area is 3 (1 loopback)
It is a stub area, no summary LSA in this area
generates stub default route with cost 1
Area has no authentication
SPF algorithm last executed 00:08:58.532 ago
SPF algorithm executed 15 times
Area ranges are
10.89.1.0/25 Active(51) Advertise
10.93.1.0/26 Active(50) Advertise
10.95.1.0/29 Active(1) Advertise
Number of LSA 5. Checksum Sum 0x027626
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
98
r4#show ip ospf
Routing Process "ospf 1" with ID 10.95.1.4
Start time: 00:48:05.484, Time elapsed: 01:03:02.596
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. 0 normal 1 stub 0 nssa
Number of areas transit capable is 0
External flood list length 0
Area 1
Number of interfaces in this area is 7 (1 loopback)
It is a stub area
Area has no authentication
SPF algorithm last executed 00:42:53.060 ago
SPF algorithm executed 8 times
Area ranges are
Number of LSA 5. Checksum Sum 0x027626
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
Шаг 3
Посмотрите таблицы топологии внутренних маршрутизаторах
полностью тупиковых зон.
r4#show ip ospf database
OSPF Router with ID (10.95.1.4) (Process ID 1)
Router Link States (Area 1)
Link ID ADV Router Age Seq# Checksum Link count
10.95.1.2 10.95.1.2 442 0x80000008 0x00A5B8 5
10.95.1.4 10.95.1.4 442 0x80000007 0x004DC4 8
10.95.1.5 10.95.1.5 434 0x80000006 0x00F4F8 8
Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
10.93.1.34 10.95.1.5 434 0x80000004 0x004828
Summary Net Link States (Area 1)
Link ID ADV Router Age Seq# Checksum
0.0.0.0 10.95.1.2 125 0x80000003 0x00458A
99
В полностью тупиковую зону перестали распространяться не только
внешние сообщения LSA, но суммарные сообщения LSA. Они были
заменены одним суммарным сообщением LSA, указывающим на
пограничный маршрутизатор тупиковой зоны.
Шаг 4
Посмотрите, как отразилось изменение таблиц топологии на таблицы
маршрутизации внутренних маршрутизаторов полностью тупиковых зон.
r4#show ip route
.. .. ..
Gateway of last resort is 10.93.1.1 to network 0.0.0.0
10.0.0.0/8 is variably subnetted, 14 subnets, 2 masks
O 10.89.1.80/28 [110/2] via 10.93.1.34, 00:37:56, FastEthernet0/0
O 10.89.1.64/28 [110/2] via 10.93.1.34, 00:37:56, FastEthernet0/0
O 10.89.1.112/28 [110/2] via 10.93.1.34, 00:37:56, FastEthernet0/0
O 10.89.1.96/28 [110/2] via 10.93.1.34, 00:37:56, FastEthernet0/0
C 10.89.1.16/28 is directly connected, FastEthernet0/1.812
O 10.93.1.16/28 [110/51] via 10.93.1.34, 00:37:56, FastEthernet0/0
C 10.95.1.4/32 is directly connected, Loopback0
O 10.95.1.5/32 [110/2] via 10.93.1.34, 00:37:57, FastEthernet0/0
C 10.89.1.0/28 is directly connected, FastEthernet0/1.811
O 10.95.1.2/32 [110/51] via 10.93.1.1, 00:37:57, Serial0/0/0
C 10.93.1.0/28 is directly connected, Serial0/0/0
C 10.89.1.48/28 is directly connected, FastEthernet0/1.814
C 10.89.1.32/28 is directly connected, FastEthernet0/1.813
C 10.93.1.32/28 is directly connected, FastEthernet0/0
O*IA 0.0.0.0/0 [110/51] via 10.93.1.1, 00:02:23, Serial0/0/0
В таблицах маршрутизации внутренних маршрутизаторов полностью
тупиковых зон отсутствуют маршруты не только до внешних сетей
получателей, но и межзональные маршруты. Такие маршруты были заменены
маршрутом по умолчанию до пограничного маршрутизатора полностью
тупиковой зоны.
100