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               10.1.12.1       YES NVRAM  up                    up     
Serial1/0.13               10.1.13.1       YES NVRAM  up                    up     
Loopback0                  1.1.1.1         YES NVRAM  up                    up     
Loopback1                  11.11.11.11     YES NVRAM  up                    up     
Loopback2                  12.12.12.12     YES NVRAM  up                    up     
Loopback3                  13.13.13.13     YES NVRAM  up                    up   

r1#show ip interface brief
Serial1/0                  [up/up]
Serial1/0.12               [up/up]
    FE80::CE00:20FF:FE78:0
    2001:10:1:12:CE00:20FF:FE78:0
Serial1/0.13               [up/up]
    FE80::CE00:20FF:FE78:0
    2001:10:1:13:CE00:20FF:FE78:0
Loopback0                  [up/up]
    FE80::CE00:20FF:FE78:0
    2001:1:1:1::1
Loopback1                  [up/up]
    FE80::CE00:20FF:FE78:0
    2001:11:11:11::11
Loopback2                  [up/up]
    FE80::CE00:20FF:FE78:0
    2001:12:12:12::12
Loopback3                  [up/up]
    FE80::CE00:20FF:FE78:0
    2001:13:13:13::13

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 0×0(0)/0×0(0)/0×0(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?

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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.

Answer:
 ip prefix-list NO_DEFAULT sequence 10 deny 0.0.0.0/0
 ip prefix-list NO_DEFAULT sequence 20 permit 0.0.0.0/0 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