3com S7906E Guide De Référence

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The smaller the hello interval is, the faster the network converges and the more network resources 
are consumed. 
A so small retransmission interval will lead to unnecessary retransmissions. A big value is 
appropriate for a low speed link.  
You need to specify an appropriate transmission delay with the trans-delay keyword. 
The authentication mode at the non-backbone virtual link end follows the one at the backbone virtual 
link end. The two authentication modes (MD5 or Simple) are independent, and you can specify neither 
of them.  
Related commands: authentication-modedisplay ospf
Examples 
# Configure a virtual link to the neighbor with router ID 1.1.1.1. 
<Sysname> system-view 
[Sysname] ospf 100 
[Sysname-ospf-100] area 2 
[Sysname-ospf-100-area-0.0.0.2] vlink-peer 1.1.1.1