[c-nsp] smaller PI

[Bøvre Jon Harald]

Snapshot of one of our internet routers recieving full IPv4 (/24 limit) and full IPv6 routing:
Cisco 7604, SUP720-3BXL

L3 Forwarding Resources
 Module              FIB TCAM usage:                     Total        Used     %Used
   1                     72 bits (IPv4, MPLS, EoM)      524288      319732     61%
                        144 bits (IP mcast, IPv6)      262144         3008      1%

                     detail:      Protocol                    Used       %Used
                                  IPv4                      319732         61%
                                  MPLS                           0          0%
                                  EoM                            0          0%

                                  IPv6                        3002          1%
                                  IPv4 mcast                     3          1%
                                  IPv6 mcast                     3          1%


1: What would be the increase in usage of IPv4 TCAM if we increased to accept /27? Additional 20k - 50 k prefix?
2: At how many prefix will we start getting trouble? (Remember one old SUP720,3B partitioned for 239k IPv4 started getting problems at approx. 210k prefixes)
I do not expect this hardware to handle 524k prefixes.

 Expect routing table to be even more fragmented in the future and believe it is better to leve room for growth in /8-/24, dropping /25 ->

Jon Harald Bøvre
________________________________________
Fra: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] på vegne av Seth Mattinen [sethm at rollernet.us]
Sendt: 1. juli 2010 17:33
Til: cisco-nsp at puck.nether.net
Emne: Re: [c-nsp] smaller PI

On 7/1/10 12:30 AM, Jan Gregor wrote:
> Hi,
>
> On 06/30/2010 02:39 PM, Jan Gregor wrote:
>> Hi,
>>
>>>> one of our customers requested PI adresses from RIPE (for whatever
>>>> reason) and got back /26.
>>>> Opinions?
>>>>
>>>> Best regards,
>>>>
>>>> Jan
>>>
>>> Will anybody accept a prefix smaller than a /24 (we won't for one ;-) ?
>>>
>>> It isn't in addition to existing PI space is it, so they actually have a
>>> larger block than this to advertise?
>>
>>
>> Nope, it's just that /26 . Probably other parts of that /24 will be
>> assigned to other customers.
>>
>> Best regards,
>>
>> Jan
>
> Update: other parts of that /24 ARE allocated to other companies.
>


If it were me, I'd just return it to RIPE and get PA space until they
can get a PI /24. All discussions of what should/may happen aside, a /26
is going to be useless *today* if they need global visibility with it.

~Seth
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