Hi Martin, Exactly. Both modes (control & echo) are used when using the echo mode. The hardware handled echo packets are not eligible to remote cpu fluctuations because of the fact that we use the actual remote forwarding router mechanism. So you have more reliable and fast failure detection with echo mode. Farther, because with echo mode you actually use control (or asycnhronous) mode also, you may configure the slow timer to slow down the probable reaction of the control bfd packets and the cpu load that these packets intoduce.
http://www.cisco.com/en/US/docs/switches/datacenter/sw/6_x/nx-os/interfaces/ configuration/guide/if_bfd.pdf page 3 Dimitris -----Original Message----- From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Martin T Sent: Thursday, February 6, 2014 8:46 PM To: cisco-nsp@puck.nether.net Subject: [c-nsp] understanding BFD "echo mode" Hi, some Cisco routers support BFD in "echo mode". Am I correct that BFD "echo packets" are send besides BFD "control messages" once "echo mode" is enabled and Cisco routers are able to handle former in hardware while BFD "control messages" are punted? regards, Martin _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
