On 3/19/18 12:58 PM, Saku Ytti wrote: > Hey David, > >> The Linux stack does not flatten routes when inserting into the FIB. >> Recursion is expected to be done a routing daemon such as bgp which will >> be able to handle updates as the network changes. > > Are you saying that routing protocol would observe the next-hop > change, then update the Linux kernel route to reflect that?
yes > > Wouldn't that add another layer of state and the implied delays of > maintaining and updating the state. > > Is it not practical to do lookup per-packet to recurse until egress > rewrite information is found? So literally no state in memory anywhere > saying 0/0 next-hop is 192.0.2.42/22:22:22:22:22:22, it would always > have to walk the FIB to find it. > you want per-packet overhead instead of deferring the overhead event based updates? network events tend to be much less frequent than sending/forwarding packets.
