Hi, On Thu, Jan 31, 2019 at 10:51:01AM +0200, Saku Ytti wrote: > On Thu, 31 Jan 2019 at 10:34, Robert Raszuk <[email protected]> wrote: > > > As mentioned on the other thread decent routers should resolve peer's IP to > > mac when creating FIB adj and building rewrite entries. > > There is no "first packet" notion nor any ARPing driven by packet > > reception. This should apply to p2p adj as well as p2mp - classic LANs. > > > Are you guys saying that say MXes don't do that ? > > I'm not sure what you are saying. I must misunderstand, but are you > saying once I configure /8 LAN, router ARPs all of them periodically > until the end of time, retaining unresolved, resolved cache for each > of /8? Which router does this?
I think Robert is talking about router-to-router LANs, where you have
"prior knowledge" in your FIB.
Like, OSPF neighbours, or BGP next-hops pointing to LAN adjacencies - so
the router could go out and start the ARP process the moment it learns
"I have a next-hop in BGP pointing to <lan interface>:<ip>".
(I think it would be a great thing to have, especially including a
feedback mechanism "ARP / ND failed, this next-hop is invalid!" to BGP -
solve a number of blackhole problems with indirect BGP routes)
getr
--
"If was one thing all people took for granted, was conviction that if you
feed honest figures into a computer, honest figures come out. Never doubted
it myself till I met a computer with a sense of humor."
Robert A. Heinlein, The Moon is a Harsh Mistress
Gert Doering - Munich, Germany [email protected]
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