BGP offloading (fixing legacy router BGP scalability issues)

Colin Johnston colinj at
Thu Apr 2 07:35:48 UTC 2015

or ignore/block russia and north korea and china network blocks
takes away 5% of network ranges for memory headroom, especially the large number of smaller china blocks.
Some may say this is harsh but is the network contacts refuse to co-operate with abuse and 100% of the traffic is bad then why not


> On 2 Apr 2015, at 07:59, Mark Tinka <mark.tinka at> wrote:
> On 1/Apr/15 19:01, Frederik Kriewitz wrote:
>> We're wondering if anyone has experience with such a setup?
> Cisco have a feature called BGP-SD (BGP Selective Download).
> With BGP-SD, you can hold millions of entries in RAM, but decide what
> gets downloaded into the FIB. By doing this, you can still export a full
> BGP table to customers directly connected to your 6500, and only have a
> 0/0 + ::/0 (and some more customer routes) in the FIB to do forwarding
> to a bigger box.
> BGP-SD started shipping in IOS XE, but I now understand that the feature
> is on anything running IOS 15.
> This would be my recommendation.
> Mark.

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