What is the use of "Authentication" Keyword in Virtual-link

From: The Great Ryan (pv.ryan@gmail.com)
Date: Wed Oct 26 2005 - 05:04:07 GMT-3


Hi Group,

I'm trying to connect Router1 to area 0 by virtual-link comnad. I got
same result when I use or not to use "authentication" keyword in
virtual-link commnad. It shows that the virtual-link enable Simple
password authentication.

What is the use of "Authentication" Keyword in Virtual-link command? Thanks !

Ryan

================ Without "Authentication" Keyword ==================
router ospf 1
 area 0 authentication
 area 1 virtual-link 2.2.2.2 authentication-key cisco
!
Router1#show ip ospf virtual-links
Virtual Link OSPF_VL0 to router 2.2.2.2 is up
  Run as demand circuit
  DoNotAge LSA allowed.
  Transit area 1, via interface Serial0/1, 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 00:00:02
    Adjacency State FULL (Hello suppressed)
    Index 1/2, retransmission queue length 0, number of retransmission 1
    First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
    Last retransmission scan length is 1, maximum is 1
    Last retransmission scan time is 0 msec, maximum is 0 msec
  Simple password authentication enabled

================ With "Authentication" Keyword ==================
router ospf 1
 area 0 authentication
 area 1 virtual-link 2.2.2.2 authentication authentication-key cisco
!
Router1#show ip ospf virtual-links
Virtual Link OSPF_VL0 to router 2.2.2.2 is up
  Run as demand circuit
  DoNotAge LSA allowed.
  Transit area 1, via interface Serial0/1, 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 (Hello suppressed)
    Index 1/3, retransmission queue length 0, number of retransmission 1
    First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
    Last retransmission scan length is 1, maximum is 1
    Last retransmission scan time is 0 msec, maximum is 0 msec
  Simple password authentication enabled



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