OSPF Secondary IP address
Config
iosv-1(config)#int gi0/1
iosv-1(config-if)#ip add 20.1.1.2 255.255.255.0 secondary
iosv-1(config-if)#ip o 1 area 0
iosv-3(config-if-range)#int gi0/0
iosv-3(config-if)#ip add 30.1.1.3 255.255.255.0 secondary
iosv-3(config-if)#ip o 1 area 0その他、Loopbackをx.x.x.x/8で設定
全I/FにてOSPF起動。
確認
traceroute
iosv-0#trace 30.1.1.3
Type escape sequence to abort.
Tracing the route to 30.1.1.3
VRF info: (vrf in name/id, vrf out name/id)
1 192.168.12.2 8 msec 5 msec 4 msec
2 192.168.23.3 6 msec 6 msec * iosv-3にまでたどり着いてからsecondaryに到着してる。
show ip route
iosv-0#sh ip ro | b Gate
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 1.0.0.0/8 is directly connected, Loopback0
L 1.1.1.1/32 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.12.2, 00:12:00, GigabitEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/3] via 192.168.12.2, 00:11:24, GigabitEthernet0/0
20.0.0.0/24 is subnetted, 1 subnets
O 20.1.1.0 [110/2] via 192.168.12.2, 00:10:22, GigabitEthernet0/0
23.0.0.0/24 is subnetted, 1 subnets
O 23.1.1.0 [110/3] via 192.168.12.2, 00:10:57, GigabitEthernet0/0
30.0.0.0/24 is subnetted, 1 subnets
O 30.1.1.0 [110/3] via 192.168.12.2, 00:10:33, GigabitEthernet0/0
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/0
L 192.168.12.1/32 is directly connected, GigabitEthernet0/0
O 192.168.23.0/24 [110/2] via 192.168.12.2, 00:12:00, GigabitEthernet0/0
iosv-3#sh ip ro | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/3] via 192.168.23.2, 00:08:13, GigabitEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.23.2, 00:08:13, GigabitEthernet0/0
3.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 3.0.0.0/8 is directly connected, Loopback0
L 3.3.3.3/32 is directly connected, Loopback0
20.0.0.0/24 is subnetted, 1 subnets
O 20.1.1.0 [110/2] via 192.168.23.2, 00:07:05, GigabitEthernet0/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.1.1.0/24 is directly connected, GigabitEthernet0/0
L 23.1.1.3/32 is directly connected, GigabitEthernet0/0
30.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 30.1.1.0/24 is directly connected, GigabitEthernet0/0
L 30.1.1.3/32 is directly connected, GigabitEthernet0/0
O 192.168.12.0/24 [110/2] via 192.168.23.2, 00:08:13, GigabitEthernet0/0
192.168.23.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.23.0/24 is directly connected, GigabitEthernet0/0
L 192.168.23.3/32 is directly connected, GigabitEthernet0/0
iosv-1#sh ip ro | b Gate
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/2] via 192.168.12.1, 00:08:34, GigabitEthernet0/0
2.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 2.0.0.0/8 is directly connected, Loopback0
L 2.2.2.2/32 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/2] via 192.168.23.3, 00:08:07, GigabitEthernet0/1
20.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 20.1.1.0/24 is directly connected, GigabitEthernet0/1
L 20.1.1.2/32 is directly connected, GigabitEthernet0/1
23.0.0.0/24 is subnetted, 1 subnets
O 23.1.1.0 [110/2] via 192.168.23.3, 00:07:31, GigabitEthernet0/1
30.0.0.0/24 is subnetted, 1 subnets
O 30.1.1.0 [110/2] via 192.168.23.3, 00:07:07, GigabitEthernet0/1
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/0
L 192.168.12.2/32 is directly connected, GigabitEthernet0/0
192.168.23.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.23.0/24 is directly connected, GigabitEthernet0/1
L 192.168.23.2/32 is directly connected, GigabitEthernet0/1show ip ospf route
iosv-0#sh ip o route
OSPF Router with ID (1.1.1.1) (Process ID 1)
Base Topology (MTID 0)
Area BACKBONE(0)
Intra-area Route List
* 192.168.12.0/24, Intra, cost 1, area 0, Connected
via 192.168.12.1, GigabitEthernet0/0
*> 192.168.23.0/24, Intra, cost 2, area 0
via 192.168.12.2, GigabitEthernet0/0
*> 20.1.1.0/24, Intra, cost 2, area 0
via 192.168.12.2, GigabitEthernet0/0
*> 23.1.1.0/24, Intra, cost 3, area 0
via 192.168.12.2, GigabitEthernet0/0
*> 30.1.1.0/24, Intra, cost 3, area 0
via 192.168.12.2, GigabitEthernet0/0
* 1.1.1.1/32, Intra, cost 1, area 0, Connected
via 1.1.1.1, Loopback0
*> 2.2.2.2/32, Intra, cost 2, area 0
via 192.168.12.2, GigabitEthernet0/0
*> 3.3.3.3/32, Intra, cost 3, area 0
via 192.168.12.2, GigabitEthernet0/0
First Hop Forwarding Gateway Tree
1.1.1.1 on Loopback0, count 1
192.168.12.1 on GigabitEthernet0/0, count 1
192.168.12.2 on GigabitEthernet0/0, count 6
iosv-1#sh ip o route
OSPF Router with ID (2.2.2.2) (Process ID 1)
Base Topology (MTID 0)
Area BACKBONE(0)
Intra-area Route List
* 192.168.23.0/24, Intra, cost 1, area 0, Connected
via 192.168.23.2, GigabitEthernet0/1
* 192.168.12.0/24, Intra, cost 1, area 0, Connected
via 192.168.12.2, GigabitEthernet0/0
* 20.1.1.0/24, Intra, cost 1, area 0, Connected
via 20.1.1.2, GigabitEthernet0/1
*> 23.1.1.0/24, Intra, cost 2, area 0
via 192.168.23.3, GigabitEthernet0/1
*> 30.1.1.0/24, Intra, cost 2, area 0
via 192.168.23.3, GigabitEthernet0/1
*> 1.1.1.1/32, Intra, cost 2, area 0
via 192.168.12.1, GigabitEthernet0/0
* 2.2.2.2/32, Intra, cost 1, area 0, Connected
via 2.2.2.2, Loopback0
*> 3.3.3.3/32, Intra, cost 2, area 0
via 192.168.23.3, GigabitEthernet0/1
First Hop Forwarding Gateway Tree
2.2.2.2 on Loopback0, count 1
192.168.12.1 on GigabitEthernet0/0, count 1
192.168.12.2 on GigabitEthernet0/0, count 1
20.1.1.2 on GigabitEthernet0/1, count 1
192.168.23.2 on GigabitEthernet0/1, count 1
192.168.23.3 on GigabitEthernet0/1, count 3
iosv-3#sh ip o route
OSPF Router with ID (3.3.3.3) (Process ID 1)
Base Topology (MTID 0)
Area BACKBONE(0)
Intra-area Route List
* 192.168.23.0/24, Intra, cost 1, area 0, Connected
via 192.168.23.3, GigabitEthernet0/0
*> 192.168.12.0/24, Intra, cost 2, area 0
via 192.168.23.2, GigabitEthernet0/0
*> 20.1.1.0/24, Intra, cost 2, area 0
via 192.168.23.2, GigabitEthernet0/0
* 23.1.1.0/24, Intra, cost 1, area 0, Connected
via 23.1.1.3, GigabitEthernet0/0
* 30.1.1.0/24, Intra, cost 1, area 0, Connected
via 30.1.1.3, GigabitEthernet0/0
*> 1.1.1.1/32, Intra, cost 3, area 0
via 192.168.23.2, GigabitEthernet0/0
*> 2.2.2.2/32, Intra, cost 2, area 0
via 192.168.23.2, GigabitEthernet0/0
* 3.3.3.3/32, Intra, cost 1, area 0, Connected
via 3.3.3.3, Loopback0
First Hop Forwarding Gateway Tree
23.1.1.3 on GigabitEthernet0/0, count 1
30.1.1.3 on GigabitEthernet0/0, count 1
192.168.23.2 on GigabitEthernet0/0, count 4
192.168.23.3 on GigabitEthernet0/0, count 1
3.3.3.3 on Loopback0, count 1SecondaryはOSPFに参加させない
Config
iosv-1(config-if)#ip o 1 area 0 secondaries none
iosv-3(config-if)#ip o 1 area 0 secondaries noneshow ip route
iosv-0#sh ip ro | b Gate
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 1.0.0.0/8 is directly connected, Loopback0
L 1.1.1.1/32 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/2] via 192.168.12.2, 00:22:11, GigabitEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/3] via 192.168.12.2, 00:21:35, GigabitEthernet0/0
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/0
L 192.168.12.1/32 is directly connected, GigabitEthernet0/0
O 192.168.23.0/24 [110/2] via 192.168.12.2, 00:22:11, GigabitEthernet0/0show ip ospf route
iosv-0#sh ip o route
OSPF Router with ID (1.1.1.1) (Process ID 1)
Base Topology (MTID 0)
Area BACKBONE(0)
Intra-area Route List
* 192.168.12.0/24, Intra, cost 1, area 0, Connected
via 192.168.12.1, GigabitEthernet0/0
*> 192.168.23.0/24, Intra, cost 2, area 0
via 192.168.12.2, GigabitEthernet0/0
* 1.1.1.1/32, Intra, cost 1, area 0, Connected
via 1.1.1.1, Loopback0
*> 2.2.2.2/32, Intra, cost 2, area 0
via 192.168.12.2, GigabitEthernet0/0
*> 3.3.3.3/32, Intra, cost 3, area 0
via 192.168.12.2, GigabitEthernet0/0
First Hop Forwarding Gateway Tree
1.1.1.1 on Loopback0, count 1
192.168.12.1 on GigabitEthernet0/0, count 1
192.168.12.2 on GigabitEthernet0/0, count 3参考
CCIE Enterprise Infrastructure Foundation, 2nd Edition