Thank you for the advise, Ondrej. I've heard that some l3 switches do not support add-path feature in VRFs, but in this case I'm using routers, so this should work fine.
- Roman. On Tue, Jan 22, 2019 at 9:38 AM Ondrej Zajicek <santi...@crfreenet.org> wrote: > On Fri, Jan 18, 2019 at 01:14:47PM -0500, Roman Romanyak wrote: > > Hello Bird users, > > > > Does anyone know if there is a way to announce a BGP route back to the > > router it was received from. > > I need to do this for the following scenario. > > Hi > > I recently thought about a setup where a route-reflector modifies routes > and propagates modified routes to its clients. To avoid issue with > announcing route back and with (like you noticed) and with withdrawing > original route (like Alexander Zubkov noticed) there is a simple solution: > > Use two RIB routing tables on clients and two single-directional BGP > sessions - first RIB table collects routes from EBGP peers and uses first > BGP session to propagate that to route-reflector, then second BGP session > is used to propagate all routes back from route-reflector to second table > in clients, while second table is connected to kernel/FIB. > > Such setup could be done in BIRD, i am just wondering whether client part > of such setup could be done with common L3 switches with BGP support. > > -- > Elen sila lumenn' omentielvo > > Ondrej 'Santiago' Zajicek (email: santi...@crfreenet.org) > OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) > "To err is human -- to blame it on a computer is even more so." >
