ccnp官方教材-bsci-配置ospf路由协议-ospf虚连接
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BSCI 2.0—4-9
OSPF Virtual Link Configuration Example 2
© 2003, Cisco Systems, Inc. All rights reserved.
BSCI 2.0—4-10
The show ip ospf virtual-links Command
© 2003, Cisco Systems, Inc. All rights reserved.
BSCI 2.0—4-11
Summary
This lesson presented these key points:
• A virtual link is a feature used to temporarily mend backbone failures.
Router# show ip ospf virtual-links Virtual Link to router 10.2.2.2 is up
Transit area 0.0.0.1, via interface Ethernet0, Cost of using 10 Transmit Delay is 1 sec, State POINT_TO_POINT Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 0:00:08 Adjacency State FULL
2
Configuring the OSPF Protocol
© 2003, Cisco Systems, Inc. All rights reserved.
3
Open Shortest Path First Virtual Links (Optional)
© 2003, Cisco Systems, Inc. All rights reserved.
© 2003, Cisco Systems, Inc. All rights reserved.
BSCI 2.0—4-8
OSPF Virtual Link Configuration Example 1
© 2003, Cisco Systems, Inc. All rights reserved.
BSCI 2.0—4-7
Configuring Virtual Links
Router(config-router)#
area area-id virtual-link router-id
• Creates a virtual link
remoterouter# show ip ospf interface ethernet 0 Ethernet0 is up, line protocol is up
© 2003, Cisco Systems, Inc. All rights reserved.
Building Scalable Cisco Internetworks (BSCI) Version 2.0
Instructor Name
© 2003, Cisco Systems, Inc. All rights reserved.
Internet Address 10.64.0.2/24, Area 0 Process ID 1, Router ID 10.64.0.2, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 10.64.0.2, Interface address 10.64.0.2 Backup Designated router (ID) 10.64.0.1, Interface address 10.64.0.1
• There may be times when this type of connectivity is requstems, Inc. All rights reserved.
BSCI 2.0—4-6
Defining Virtual Links
• Virtual links are used to connect a discontiguous area to area 0.
4
Objectives
Upon completing this lesson, you will be able to:
• Define the two major purposes of Open Shortest Path First (OSPF) virtual links
• Identify when it is appropriate to use virtual links • Explain how OSPF virtual links operate • Configure OSPF virtual links • Verify OSPF virtual links operation
• A virtual link is part of the OSPF standard. • When configuring a virtual link, always use the
© 2003, Cisco Systems, Inc. All rights reserved.
BSCI 2.0—4-5
Illegal Area Connections
• By default, all areas must connect to area 0.
• Area 4 is connected incorrectly.
• A logical connection is built between router A and router B.
• Virtual links are recommended for backup or temporary connections.
© 2003, Cisco Systems, Inc. All rights reserved.