[outages] Optus/Akamai

[Sabri Berisha]

----- On Nov 9, 2023, at 2:31 PM, Ross Tajvar via Outages outages at outages.org wrote:

Hi,

> Surely it's better to drop some routes than to drop the whole session.

Not necessarily. If part of your IBGP feed includes 10/8 (common in datacenters), you
may end up in a situation where it's better to disable a leaking peer.

Imagine a Trident 3 box in a spine layer, with 32 northbound peers and 32 southbound
peers. Northbound you'll receive a few hundred routes, including 10/8. Southbound, 
you'll receive a few hundred host subnets and perhaps some any-cast /32s. You'll 
aggregate the host subnets northbound. 

If one of those northbound peers leaks a full table, you run the risk of losing some
of your host subnets, or perhaps important any-cast routes. I would prefer to lose 
the offending peer over risking host routes, primarily because shutting down the peer
is deterministic while you have no control over which routes are lost.

Thanks,

Sabri