3com 5500-ei pwr Guía De Referencia

 

4-51 

 router-id [ hello seconds | retransmit seconds | trans-delay seconds | dead seconds | 

 password | md5 keyid key ] * 

 vlink-peer router-id 

OSPF area view 

: Router ID of virtual link peer. 

hello seconds

: Specifies the interval, in seconds, at which the router transmits hello packet. It ranges 

from 1 to 8192 and defaults to 10. This value must equal the hello seconds value of the router virtually 
linked to the interface.  

retransmit  seconds: 

Specifies the interval, in seconds, for retransmitting the LSA packets on an 

interface. It ranges from 1 to 3600 and defaults to 5.  

 seconds: Specifies the delay, in seconds, for transmitting LSA packets on an interface. It 

ranges from 1 to 3600 and defaults to 1.  

dead seconds

: Specifies the interval, in seconds, of death timer. It ranges from 1 to 8192 and defaults 

to 40. This value must equal the dead seconds of the router virtually linked to it and must be at least 
four times of the hello seconds.  

  password:  Specifies the simple text authentication password, which contains up to eight 

characters, of the interface. This value must equal the authentication key of the virtually linked peer. 

MD5 authentication key ID. It ranges from 1 to 255. It must be equal to the authentication key ID 

of the virtually linked peer. 

: MD5 authentication key. If you use simple text authentication key, you can input a string containing 

1 to 16 characters. When you use the display current-configuration command to display system 
information, the MD5 authentication key is displayed in the form of cipher text with a length of 24 
characters. Inputting the key in the form of cipher text with a length of 24 characters is also supported. 

Use the vlink-peer command to create and configure a virtual link.  

Use the undo vlink-peer command to cancel an existing virtual link.  

According to RFC2328, an OSPF area must be connected to the backbone network. You can use the 

 command to keep the connectivity. Virtual link can be regarded as a common interface that 

uses OSPF because the principle for configuring the parameters such as hello, retransmit, and 
trans-delay on it is similar.  

Considerations on parameters: 

z

 

The smaller the hello interval is, the faster the network converges and the more network resources 
are consumed. 

z

 

A too small retransmission interval will lead to unnecessary retransmissions. A big value is 
appropriate for a low speed link. 

z

 

You need to specify an appropriate transmission delay with the trans-delay keyword.