[c-nsp] understanding BFD "echo mode"

[Waris Sagheer (waris)]

Martin,
Do you have specific platform in mind?
Hardware BFD offload implementation may be different on platforms.

Best Regards,

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Waris Sagheer
Technical Marketing Manager
Service Provider Access Group (SPAG)
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From: Dimitris Befas <dimitris.befas at gmail.com<mailto:dimitris.befas at gmail.com>>
Date: Friday, February 7, 2014 at 7:03 AM
To: 'Martin T' <m4rtntns at gmail.com<mailto:m4rtntns at gmail.com>>, "cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>" <cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>>
Subject: Re: [c-nsp] understanding BFD "echo mode"

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-bounces at puck.nether.net] On Behalf Of
Martin T
Sent: Thursday, February 6, 2014 8:46 PM
To: cisco-nsp at puck.nether.net<mailto:cisco-nsp at 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
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