CCIE Pursuit Blog

April 8, 2008

Question Of The Day: 08 April, 2008

Topic: IPv6

Router r1 is running OSPFv3:

r1#show ip interface brief | e ass
Interface                  IP-Address      OK? Method Status                Protocol
Serial1/0.12            YES NVRAM  up                    up     
Serial1/0.13            YES NVRAM  up                    up     
Loopback0                 YES NVRAM  up                    up     
Loopback1             YES NVRAM  up                    up     
Loopback2             YES NVRAM  up                    up     
Loopback3             YES NVRAM  up                    up   

r1#show ip interface brief
Serial1/0                  [up/up]
Serial1/0.12               [up/up]
Serial1/0.13               [up/up]
Loopback0                  [up/up]
Loopback1                  [up/up]
Loopback2                  [up/up]
Loopback3                  [up/up]

r1#show ip protocols summary
Index Process Name
0     connected
1     static

r1#show ipv6 protocols summary
Index Process Name
0      connected
1      static
2      ospf 100

r1#show ipv6 ospf interface
Serial1/0.12 is up, line protocol is up
  Link Local Address FE80::CE00:20FF:FE78:0, Interface ID 15
  Area 0, Process ID 100, Instance ID 0, Router ID ????
  Network Type POINT_TO_POINT, Cost: 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
  Index 1/1/1, flood queue length 0
  Next 0x0(0)/0x0(0)/0x0(0)
  Last flood scan length is 0, maximum is 0
  Last flood scan time is 0 msec, maximum is 0 msec
  Neighbor Count is 0, Adjacent neighbor count is 0
  Suppress hello for 0 neighbor(s)

r1#show run | sec ipv6 ospf|router-id
 ipv6 ospf 100 area 0

What is the OSPFv3 router-id of r1?

Click Here For Answers

Yesterday’s Question

Question Of The Day: 07 April, 2008 

Topic: IP Prefix Lists

Write an IP prefix list called “NO_DEFAULT” that allows all routes except the default route.

 ip prefix-list NO_DEFAULT sequence 10 deny
 ip prefix-list NO_DEFAULT sequence 20 permit le 32

IP prefix lists are something that you’ll need to know well for the CCIE lab.  This example uses two of the most important prefix-lists to know: the ‘all prefixes list’ and the ‘default route prefix list’.

ip prefix-list



  1. […] by Question Of The Day: 07 April, 2008 « CCIE Pursuit — April 8, 2008 @ 7:52 […]

    Pingback by Question Of The Day: 06 April, 2008 « CCIE Pursuit — April 8, 2008 @ 7:53 am | Reply

  2. CCIE Pursuit I just wanted to finally comment after reading your blog for months now. I am currently working on finishing up my CCNP (One left) and then looking forward to working on CCIE. I wanted to let you know that your blog has been very informative for me in my CCNP studies. Keep up the good work and by the way I threw up a blog at to try to help others like you and a couple others have helped myself.

    Comment by ENS Consulting LLC — April 8, 2008 @ 12:59 pm | Reply

  3. […] Question Of The Day: 08 April, 2008  […]

    Pingback by Question Of The Day: 09 April, 2008 « CCIE Pursuit — April 9, 2008 @ 6:12 am | Reply

  4. […] OSPFv3 Router-ID Uses IPv4 Address Filed under: Cisco, Cisco Certification, IOS, IPv6, OSPF — cciepursuit @ 8:37 am Tags: Cisco, Cisco IOS Hints and Tips, Humor, IPv6, OSPFv3, router-id Ivan Pepelnjak over at Cisco IOS Hint and Tricks (an absolute must-read site) has a nice post about the use of IPv4 addresses as the router ID in OSPFv3.  I touched on this in this Question of the Day. […]

    Pingback by OSPFv3 Router-ID Uses IPv4 Address « CCIE Pursuit — April 17, 2008 @ 8:38 am | Reply

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