Shulou(Shulou.com)06/01 Report--

Virtual link: a link that connects to a backbone area through a non-backbone area.

Virtual links are generally used to:

V connects a region to the backbone area through a non-backbone area.

V connects some areas on both sides of a segmented backbone area through a non-backbone area.

Configure virtual link rules:

V virtual links must be configured between two routers.

The area through which the v virtual link passes must have all the routing information.

V transfer area cannot be a stub area and NSSA area.

The stability of v virtual link depends on the stability of the region it passes through.

V virtual links help provide logical redundancy.

CISCO Cisco OSPF related commands:

Command

Description

(config) # router ospf 110

Create and enter the OSPF process

(config-router) # router-id 1.1.1.1

Configure RouterID

(config-router) # network Segment reverse Mask Area0 (area number)

Declare the network segment

(config-router) # area 1 stub

Configuration area is stub area

(config-router) # area 1 stub no-summary

The configuration area is a complete stub area

(config-router) # redistribut rip subnets

Redistribute RIP to OSPF

(config-router) # redistribut ospf metric 5

Redistribute OSPF to RIP

(config-router) # default-information originate

Default route redistribution

(config-router) # area 2 nssa

Configuration area is NSSA area

(config-router) # area 2 nssa no-summary

The configuration area is a full NSSA area

(config-router) # area 2 nssa default-information-originate

Default route redistribution in NSSA area

(config-router) # area 1 range 192.168.0.0 255.255.0.0

Summary of interarea routes

(config-router) # summary-address 192.168.0.0 255.255.0.0

External route summary

(config-router) # area 1 (area to be traversed) virtual-links 1.1.1.1 (opposite RrouterID)

Virtual link

(config-if) # ip ospf priority 1

Configure OSPF interface priority

(config-if) # ip ospf cost 19

Cost of configuring OSPF interface

# show ip ospf neighbor

View neighbor tabl

# show ip ospf neighbor detail

View neighbor table summary information

# show ip ospf

View OSPF configuration

# show ip ospf interface type number

View the data structure of the interface

# show ip ospf interface brief

View summary information for the interface

# show ip ospf interface

View the information of the interface

# clear ip ospf precesses

Clear OSPF

# show ip ospf database

View link database status

# show ip ospf adj

View OSPF adjacency information

# show ip ospf packet

View each OSPF packet information

Note: when the interface Priority priority is 0, it does not participate in the election of DR and BDR.

Huawei H3C related orders:

Command

Description

[huawei] router id 1.1.1.1

Configure RrouterID

[huawei] ospf

Create and enter the OSPF process

[huawei-ospf-1] area 0

Configuration area

[huawei-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255

Declare the network segment

[huawei-ospf-1-area-0.0.0.0] stub

Configuration area is stub area

[huawei-ospf-1-area-0.0.0.0] stub no-summay

The configuration area is a complete stub area

[huawei-ospf-1-area-0.0.0.0] nssa

Configuration area is NSSA area

[huawei] display ospf peer

View OSPF neighbor status

[huawei-ospf-1] import-route static type 1

Import static rout

[huawei] display ospf abr-asbr

View the information of ABR/ASBR

[huawei-Eth0/0/0] ospf dr-priority 1

Configure OSPF interface priority

[huawei] dispaly ospf interface

View OSPF interface status

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