Hi Ondrej,
>> Do you have more information and/or tips for me, by chance?
> As others wrote, you could do periodic pinging by e.g. fping and
> enable/disable a static
> protocol using birdc (birdc disable XXX).
> See the attached script, which does something like that and estimating packet
> loss.
Thank you very much for that script.
I have two additional questions about this:
1) Why do you stop the whole routing process if the ISP is down?
Isn't there a chance to "only" stop distributing the default-route and
keep the OSPF process?
If yes, how am I able to realize that?
2) If 1) isn't possible, is there a way to check and count incoming routes
from eBGP so that the router sees that
the connection works and distributes the default-route after the check?
My goal is to only stop distributing the default-route and not to kill any
routing-protocol such as OSPF.
Thanks in advance.
-----Ursprüngliche Nachricht-----
Von: Ondrej Zajicek [mailto:santi...@crfreenet.org]
Gesendet: Samstag, 5. Dezember 2015 16:34
An: Rohrmann Sascha
Cc: bird-users@network.cz
Betreff: Re: default route via OSPF depending on the ISP
On Thu, Dec 03, 2015 at 03:12:10PM +0000, Rohrmann Sascha wrote:
> > Well, you could use static default-route and 'check link' option, but that
> > will help you only in the third case, not in the second one.
> > For the second case, you must have some other way to establish
> > whether ISP is up or down, either by running some routing protocol between
> > you and ISP, or running BFD session.
>
> Just as you said, that will only help me in the third case.
> In which way should BFD be able to accomplish my goal?
> In my understandings BFD only checks if the link is available. If this isn't
> given, BFD tells Bird this problem.
BFD checks whether specified/destination IP is available (but it also must run
BFD).
Therefore both link and host must be up.
> Second problem is, not every ISP supports BFD yet because BFD is kinda new.
That is true, and also BFD-controlled static routes are only in devel version
of BIRD, not in v1.5.0
> I was thinking about a simple ping which checks the availability of the
> opposite party.
> Am I able to include a simple shell script in bird?
No
> Do you have more information and/or tips for me, by chance?
As others wrote, you could do periodic pinging by e.g. fping and enable/disable
a static protocol using birdc (birdc disable XXX). See the attached script,
which does something like that and estimating packet loss.
> > I was thinking about the bfd protocol, but bfd is kinda new and you can't
> > run more than one instance in bird.
> > Well, is there any reason why to run multiple BFD instances in BIRD?
>
> Well... you could create one bfd instance for one single interface.
> Furthermore you could then check the availability for e.g. my problem instead
> of checking all BFD instances.
I don't understand here.
--
Elen sila lumenn' omentielvo
Ondrej 'Santiago' Zajicek (email: santi...@crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
