OSPFv3 area range prefix? IEWB 3.0 Lab4 18.3

From: EitaroUEMURA (eitaro@zj9.so-net.ne.jp)
Date: Mon Dec 26 2005 - 09:59:25 GMT-3

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Hi Group,

Configure router summary
"ipv6 address 2001:141:1:12::2/64" and "ipv6 address 2001:141:1:25::2/64",
use "area 1 range 2001:141:1::/58".

Why isn't it a "/59" ?

I have tried configuration that is below.

interface Loopback100
 ipv6 address 2001:141:1::1/64
 ipv6 ospf 1 area 1
!
interface Loopback101
 ipv6 address 2001:141:1:1::1/64
 ipv6 ospf 1 area 1
!
....Omitted

interface Loopback199
 no ip address
 ipv6 address 2001:141:1:99::1/64
 ipv6 ospf 1 area 1

----------------------------------------------------
If configuration with "area 1 range 2001:141:1::/63"

The result is "0 to 1" is summarized.

OI 2001:141:1::/63 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:2::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:3::1/128 [110/1]
....Omitted

----------------------------------------------------
If configuration with "area 1 range 2001:141:1::/62"

The result is "0 to 3" is summarized.

OI 2001:141:1::/62 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:4::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:5::1/128 [110/1]
....Omitted

----------------------------------------------------
If configuration with "area 1 range 2001:141:1::/61"

The result is "0 to 7" is summarized.

OI 2001:141:1::/61 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:8::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:9::1/128 [110/1]
....Omitted

----------------------------------------------------
If configuration with "area 1 range 2001:141:1::/60"

The result is "0 to 9" is summarized.

OI 2001:141:1::/60 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:10::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:11::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
....Omitted

----------------------------------------------------
If configuration with "area 1 range 2001:141:1::/59"

The result is "0 to 19" is summarized.

OI 2001:141:1::/59 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:20::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:21::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
....Omitted

----------------------------------------------------
If configuration with "area 1 range 2001:141:1::/58"

The result is "0 to 39" is summarized.

OI 2001:141:1::/58 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:40::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
OI 2001:141:1:41::1/128 [110/1]
     via FE80::202:4AFF:FE8C:6438, FastEthernet0/0
....Omitted

Thanks in advance,

Eitaro

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