BGP route Aggregation Inbound

[Peter Handke]

Its' possible to aggregate routes received from a neighbour? The Neighbours are in a different AS so the peering is EBGP, i'd like to save memory of my router.

thanks

Peter

[Peter Paluch · Accepted solution]

Hi Peter,

Unfortunately, I do not know about such an option. The aggregation/summarization is always done when sending routing information, not when receiving it. Nor do I see when such a thing would be applicable: if you want to aggregate networks upon receiving them then you must already know the aggregate route itself. In such case, it should always be possible to filter out the received prefixes that are to be aggregated, and install a static aggregate route pointing towards the sources of the un-aggregated prefixes (that have just been filtered out).

The easiest and the most clean way, in my opinion, would be to ask your EBGP neighbor administrators to configure aggregation towards you - or, if a default route is sufficient, to advertise just a default route to you without further prefixes.

Best regards,

Peter