Why ospf virtual run as DoNotAge LAS not allowed?

From: Andy (ccie100@xxxxxxxxxxxx)
Date: Fri Aug 17 2001 - 06:30:16 GMT-3


   
In fatkid lab 401 Advanced ospf lab.
On my router , The virtual link status is like this, and Run as demand circuit,
 but the normal status should be DoNotAge LSA allowed, But my virtual link is D
oNotAge LSA not allowed (Number of DCbitless LSA is 4). In my lab the ISDN link
 between R2 and R3 is simailar too, the database entry has no DNA attribute, an
d every 30 minitues the isdn link will up for LSA Flood.

R4#sh ip os vir
Virtual Link OSPF_VL1 to router 212.1.22.65 is up
  Run as demand circuit
  DoNotAge LSA not allowed (Number of DCbitless LSA is 4).
  Transit area 1, via interface Serial1, Cost of using 64
  Transmit Delay is 1 sec, State POINT_TO_POINT,
  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
    Hello due in 00:00:00
    Adjacency State FULL
  Message digest authentication enabled
      No key configured, using default key id 0

Does any one can tell me Why

Thanks
Andy
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