Re: How are you configuring BFD timers?

[Saku Ytti <saku () ytti fi>]

On 22 March 2018 at 10:47, James Bensley <jwbensley () gmail com> wrote:

> On 21 March 2018 at 16:37, Luke Guillory <lguillory () reservetele com> wrote:
> > He's asking because if it was dark the interface would go down when the link was lost and the router would pull 
> > routes. But PA to FL would lead me to believe it'll be a wave from some type of DWDM gear which brings us to BFD.
>
> Could it not also help with a unidirectional failure of the fibre?
> E.g. Loss of signal in only one direction might not bring the link
> down, but if one BFD peer stops receiving BFD packets it'll bring the
> link down.

Ethernet handles unidirectional failure natively through autonego asserting RFI.

A======B

B sees loss-of signal
A does not
B asserts RFI
A receives RFI and goes down


Some devices, such as JunOS can also assert RFI for external factors,
like you can ask JunOS to assert RFI to client port, when pseudowire
goes down, so client experiences link down when you experience
pseudowire down.

-- 
  ++ytti