bfd configuration

[Tim Weippert]

Hi Joel, 

On Wed, Feb 13, 2019 at 08:41:54PM +0100, Joel Dahl wrote:
> On Wed, Feb 13, 2019 at 02:31:41PM +0100, Bernd Naumann wrote:
> > Hi Joel,
> > 
> > On 12.02.19 21:08, Joel Dahl wrote:
> > > Hi,
> > > 
> > > I've enabled bfd on an iBGP session between two routers. The routers are directly connected, just L2.
> > > 
> > > Taking down the iBGP session (in this case, rebooting the router) results in the following which I find a bit confusing:
> > > 
> > > # birdc show proto
> > > BIRD 2.0.3 ready.
> > > Name       Proto      Table      State  Since         Info
> > > bfd_ibgp_v4 BFD        ---        up     2019-02-11

[...] 

This indicates that the BFP Protocol is up not more as i know.

> So the bfd state being "up" has nothing to do with the actual session with the
> neighbor being up or down?

If you want see the different neighbor states use:

sh bfd sessions

...
172.XXX.XXX.45              eth0       Down       2018-12-08    1.000    0.000
172.XXX.XXX.15              eth0       Up         2018-12-01    0.100    0.500
172.XXX.XXX.6               eth0       Up         2018-12-16    0.100    0.500
...

This should indicate the different neighbors.

HTH, 
tim

-- 
Tim Weippert
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