beautypg.com

7 area virtual-link, Area virtual, Link – PLANET XGS3-24040 User Manual

Page 455

background image


33-168

Switch (config)# router ospf 100

Switch (config-router)# area 1 stub

Related Command:

area default-cost

33.7 area virtual-link

Command:

area <id> virtual-link A.B.C.D {AUTHENTICATION |AUTH_KEY | INTERVAL}

no area <id> virtual-link A.B.C.D [AUTHENTICATION | AUTH_KEY | INTERVAL]

Function:

Configure a logical link between two backbone areas physically divided by non-backbone area. The

no area <id> virtual-link A.B.C.D [AUTHENTICATION | AUTH_KEY | INTERVAL]” command

removes this virtual-link.

Parameter:

<id> is the area number which could be digits ranging between 0~4294967295, and also as an IP

address.

AUTHENTICATION = authentication [message-digest[message-digest-key <1-255> md5 ]

|null|AUTH_KEY].

authentication : Enable authentication on this virtual link.

message-digest: Authentication with MD-5.

null : Overwrite password or packet summary with null authentication.

AUTH_KEY= authentication-key <key>.

: A password consists of less than 8 characters.

INTERVAL= [dead-interval | hello-interval |

message-digest-key<1-255>md5 |

retransmit-interval | transmit-delay] .

<value>:>: The delay or interval seconds, ranging between 1~65535.

: A neighbor is considered offline for certain dead interval without its group

messages which the default is 40 seconds.

: The time interval before the router sends a hello group message, default is 10

seconds.

: Authentication key with MD-5.

: The time interval before a router retransmitting a group message, default is

5 seconds.

: The time delay before a router sending a group messages, default is 1 second.

Default:

None.

Command Mode:

OSPF protocol mode

Usage Guide:

In the OSPF all non-backbone areas will be connected to a backbone area. If the connection to the

backbone area is lost, virtual link will repair this connection. You can configure virtual link between

any two backbone area routers connected with the public non-backbone area. The protocol treat

routers connected by virtual links as a point-to-point network.