Nikolay Denev wrote this message on Sat, Aug 23, 2014 at 19:33 +0200:
> On Sat, Aug 23, 2014 at 8:49 AM, Adrian Chadd <adr...@freebsd.org> wrote:
> > Ok, so how does the whole protocol thing implement priority?
>
> Ah, sorry, reading again I don't think it does that. For some reason I
> was under the impression it does.
> So, it looks like it's just a 8 bit tag applied to each route, not
> involved in the actual routing, but allows you
> to filter when displaying etc.
> >From linux ip-route(8) man page :
>
> protocol RTPROTO
> the routing protocol identifier of this route. RTPROTO may be a
> number or a string from the file /etc/iproute2/rt_protos. If
> the routing protocol ID is not given, ip assumes protocol boot
> (i.e. it assumes the route was added by someone who doesn't
> understand what they are doing). Several protocol values have a
> fixed interpretation. Namely:
>
> redirect - the route was installed due to an ICMP
> redirect.
>
> kernel - the route was installed by the kernel during
> autoconfiguration.
>
> boot - the route was installed during the bootup
> sequence. If a routing daemon starts, it will purge all
> of them.
>
> static - the route was installed by the administrator to
> override dynamic routing. Routing daemon will respect
> them and, probably, even advertise them to its peers.
>
> ra - the route was installed by Router Discovery
> protocol.
>
> The rest of the values are not reserved and the administrator is
> free to assign (or not to assign) protocol tags.
If that's the case, a simple man route would have found the answer:
-proto1 RTF_PROTO1 - set protocol specific routing flag #1
-proto2 RTF_PROTO2 - set protocol specific routing flag #2
-proto3 RTF_PROTO3 - set protocol specific routing flag #3
Not as many as Linux, but I do believe some of the routing daemons use
this flag to know what routes it can delete or not...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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