CCIE Pursuit Blog

April 18, 2008

Question Of The Day: 18 April, 2008

Topic: OSPF

Configure an OSPF dead-interval of 1 second on interface fa0/0 of r1.

Click Here For The Answer


Yesterday’s Question

Question Of The Day: 17 April, 2008 

Topic: OSPF

ospf router 100
  network 10.1.1.1 0.0.0.0 area 0
  area 0 authentication
  area 123 authentication message-digest
  network 1.1.1.1 0.0.0.0 area 0
  network 10.1.2.1 0.0.0.0 area 123
  area 123 virtual-link 2.2.2.2

Which type of OSPF authentication is the virtual-link running?

Answer:  The virtual-link will be running simple password authentication.

It’s very important to remember that a virtual-link belongs to area 0.  Don’t get fooled into thinkning that the virtual-link belongs to the ‘transit area’. 

r1(config-router)#do sh ip os int br | i Vl0
Interface    PID   Area            IP Address/Mask    Cost  State Nbrs F/C
Vl0          100   0               10.1.12.1/24       1     P2P   1/1

In our example we’ve turned on simple authentication for all interfaces in area 0 and MD5 authentication for all interfaces in area 123.

r1(config-router)#do sh ip os int | i proto|uth
FastEthernet1/0 is up, line protocol is up
  Simple password authentication enabled
Loopback0 is up, line protocol is up
OSPF_VL0 is up, line protocol is up
  Simple password authentication enabled
FastEthernet0/0
is up, line protocol is up
  Message digest authentication enabled

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