From: Hyunseog Ryu (r.hyunseog@ieee.org)
Date: Fri Aug 12 2005 - 15:00:05 GMT-3
gladston@br.ibm.com wrote:
>Hi,
>
>This example seems to be wrong. What do you think?
>
>====================================================
>For example, an NLA provider with the address space of 2001:0420:0001::/48 can allocate the following address space:
>
>
> 2001:0420:0001:1:/48
>
> 2001:0420:0001:2:/48
>
> 2001:0420:0001:3:/48
>
>
2001:0420:0001:1:: , 2001:0420:0001:2::, and 2001:0420:0001:3:: should
be /64 or smaller block.
>quoted from:
>Configuring IPv6 with Cisco IOS
>by Sam Brown
>===================================================
>
>The /48 for the customers...it is not right.
>It should be other than /48 (for example /64 or /52) to the customer, otherwise it overlaps.
>Agree?
>
>The book is giving an example of TLA, sub-TLA, and NLA prefix allocation.
>
>TLA-1 provides this prefix to sub-TLA1:
> 2001:0420::/35 - sub-TLA1
>
>sub-TLA-1 provides this prefix to NLA-x:
> 2001:0428:0001::/48
>
>NLA-x provides these prefixes to its customers:
>
>customer 1 2001:0420:0001:1:/48
>customer 2 2001:0420:0001:2:/48
>
>
>
>Test 1:
>
>Rack2R3(config)#int lo 1001
>Rack2R3(config-if)#ipv6 address 2001:0420:0001:1::3/48
>
>Rack2R3(config-if)#int lo 1002
>Rack2R3(config-if)#ipv6 address 2001:0420:0001:2::3/48
>% Prefix 2001:420:1:2::3/48 overlaps with another prefix
>
>
I believe above prefix should be /64 or something like that.
>
>Test 2:
>On this test, R5 is the NLA and R2/R3 are customers.
>
>Rack2R3#
>
>interface Loopback1001
> no ip address
> ipv6 address 2001:420:1:1::3/48
> ipv6 address 2001:420:1:2::3/48
> ipv6 rip RIPng enable
>
>Rack2R3#
>
>interface Loopback1001
> no ip address
> ipv6 address 2001:420:1:3::2/48
> ipv6 rip RIPng enable
>
>
>Rack2R5#sh ipv6 route rip | b 2001:420:1:
>R 2001:420:1::/48 [120/2]
> via FE80::2, Serial0/0
> via FE80::3, Serial0/0
>
>
>Rack2R5#pi 2001:0420:0001:3::2
>
>debug:
>
>Rack2R3#
>Aug 12 10:41:20: IPV6: source 2001:148:5:235::5 (Serial1/0.235)
>Aug 12 10:41:20: dest 2001:420:1:3::2 (Loopback1001)
>
>Rack2R2#
>Aug 12 10:41:22: IPV6: source 2001:148:5:235::5 (Serial0/0.235)
>Aug 12 10:41:22: dest 2001:420:1:3::2
>
>
>
>On the other hand, using prefix /52 to each customer it works fine:
>
>R 2001:420:1:2000::/52 [120/2]
> via FE80::2, Serial0/0
>R 2001:420:1:3000::/52 [120/2]
> via FE80::3, Serial0/0
>
>_______________________________________________________________________
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