Route table growth and hardware limits...talk to the filter
nanog at daork.net
Sat Sep 8 14:46:20 UTC 2007
On 8/09/2007, at 3:45 PM, Leo Bicknell wrote:
> In a message written on Fri, Sep 07, 2007 at 07:14:01PM -0400, Jon
> Lewis wrote:
>> For some reason, today I started out with fewer routes
>> I started with 230686) with no filtering.
>> RIR filter section Reduction in routes
>> APNIC 16690
>> ARIN 41070
>> RIPE 16981
>> LANIC 4468
>> AFRINIC 1516
>> TOTAL 80725
>> The end result of applying all the RIR minimum allocation filters was
>> 147564 BGP routes. I haven't checked to make sure there was no
>> loss in
>> reachability...this is just an idle 7206/NPE225 with nothing but its
>> ethernet uplink.
> The CIDR report states that we have 235647 routes that could be
> aggregated to 154503 routes. While not the same metric, I'd be
> surprised at 147,564 routes if you did not have reachability issues.
The difference is roughly 3% of the total prefixes. ((154503-147564)/
It wouldn't be hard to run some form of netflow, and gauge the amount
of traffic to those prefixes. If it's as insignificant as the number
of prefixes, get/use a 0/0 route.
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