DNA means Do Not Age.  OSPF on Demand Circuit or
virtual links do this. 

--- Dwayne Saunders  wrote:
> Hi all,
>       is any one able to direct me in the right direction
> or be able to
> explain what the (DNA) is in the sh ip ospf database
> 
>                 Router Link States (Area 0)
> 
> Link ID         ADV Router      Age         Seq#    
>   Checksum Link count
> 172.16.11.100   172.16.11.100   1970       
> 0x80000008 0x776B   5
> 172.26.1.49     172.26.1.49     5     (DNA)
> 0x80000158 0xD943   1
> 192.168.101.101 192.168.101.101 1895  (DNA)
> 0x8000015E 0xDCE3   1
> 
>                 Summary Net Link States (Area 0)
> 
> Link ID         ADV Router      Age         Seq#    
>   Checksum
> 172.26.1.17     172.26.1.49     678   (DNA)
> 0x80000155 0x23F1
> 172.26.1.33     172.26.1.49     678   (DNA)
> 0x80000155 0x8282
> 172.26.1.49     172.26.1.49     678   (DNA)
> 0x80000155 0xE113
> 192.168.1.16    172.16.11.100   1971       
> 0x80000006 0x9708
> 192.168.1.16    172.26.1.49     1     (DNA)
> 0x8000015C 0x1B5F
> 192.168.1.16    192.168.101.101 1895  (DNA)
> 0x8000000A 0x97FB
> 192.168.1.48    172.16.11.100   1971       
> 0x80000007 0x542A
> 192.168.1.48    172.26.1.49     1     (DNA)
> 0x80000003 0x8530
> 192.168.1.48    192.168.101.101 1895  (DNA)
> 0x80000005 0x6A0D
> 192.168.1.64    172.16.11.100   1971       
> 0x80000005 0xC1AD
> 192.168.1.64    172.26.1.49     678   (DNA)
> 0x80000155 0x3D15
> 192.168.1.64    192.168.101.101 1895  (DNA)
> 0x80000008 0xCD95
> 192.168.101.101 192.168.101.101 1895  (DNA)
> 0x80000007 0x527B
> 
> any help will be appreciated
> 
> D'Wayne Saunders
> Network Admin


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