> I'm being asked to look into using BFD over our P2P transport links. Is > anyone else doing this? Our transport links are all 10G Ethernet (LAN-PHY). > There's no alarming inside of LAN-PHY like there is in SONET. The transport > side should propagate a fiber break by stopping to send light on both ends. > This is enough to cause the router interfaces to drop and for protocols to > converge.
"The transport side *should* propagate ..." - but are you sure this will happen in all circumstances? Unless you are certain about this, you may want BFD. > Since LAN-PHY doesn't have any built end-end alarming, some folks believe > that we may encounter situations where a fiber break doesn't cause interfaces > do go down. Convergence would then have to wait for IGP hellos to detect the > problem. > > Is anybody else running BFD over 10G LAN-PHY transport links? Any comments > around BFD for this application in general? We run it on most 10G backbone (LAN-PHY) links. In addition to the issue of link down propagation, you may also want to standardize on BFD for all your backbone links, for simplicity's sake (same mechanism everywhere). Obviously, in order to do this you want to be sure that the BFD implementation won't give you lots of false positives. Steinar Haug, Nethelp consulting, sth...@nethelp.no
