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

Advertisements

3 Comments »

  1. […] Click Here For The Answer […]

    Pingback by Question Of The Day: 17 April, 2008 « CCIE Pursuit — April 18, 2008 @ 7:26 am | Reply

  2. QoD Answer: 04/18/08

    This is accomplished by using the following config commands. The command below sets the dead-interval to 1 second and the number after “hello-multiplier” tells the router how many hello packets to retransmit during that 1 second.

    r1(config)# interface fa0/0
    r1(config-int)# ip ospf dead-interval minimal hello-multiplier 3
    r1(config-int)# end
    r1# show ip ospf int fa0/0 | i Hello

    FastEthernet0/0 is up, line protocol is up
    Timer intervals configured, Hello 200 msec, Dead 1, Wait 1, Retransmit 3
    Hello due in 76 msec

    Comment by Ron — April 20, 2008 @ 8:03 pm | Reply

  3. […] Question Of The Day: 18 April, 2008  […]

    Pingback by Question Of The Day: 21 April, 2008 « CCIE Pursuit — April 21, 2008 @ 2:01 pm | Reply


RSS feed for comments on this post. TrackBack URI

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Blog at WordPress.com.

%d bloggers like this: