Hello folks,
I agree with Stan about not introducing the FIB into AODVv2.
Regards,
Charlie P.
On 6/4/2015 6:53 AM, Ratliff, Stanley wrote:
John,
You are correct in that there are two tables. In classic routing, the first is the Routing Information Base, or RIB. Protocols typically update the RIB as conditions warrant (e.g., as routes are created or are broken).
At least in one implementation that I’ve worked with ;-), the FIB is “shadowed” – that is, there is software watching for changes in the RIB, and those changes are then propagated to the FIB. While the RIB is used for Layer 3 and above, the FIB is optimized for Layter 2 forwarding. In AODVv2, as in any routing protocol spec, my personal opinion is that we should avoid referencing the FIB if possible.
Regards,
Stan
*From:*aodvv2-discuss-bounce@xxxxxxxxxxxxx [mailto:aodvv2-discuss-bounce@xxxxxxxxxxxxx] *On Behalf Of *John Dowdell
*Sent:* Thursday, June 04, 2015 9:06 AM
*To:* AODVv2 Discuss
*Subject:* [aodvv2-discuss] Re: Section 6.5.2/Unconfirmed routes
Hi both
So just to be a little more explicit on terminology and usage here, I believe we are discussing two tables; one is the “scratchpad” for AODVv2, and the second is the live routing table, used for forwarding user traffic. Apologies I am not sure about correct terminology but I believe the second is called the Forwarding Information Base (FIB), and live routes are exported to the FIB from the scratchpad. Please do correct my naming.
I also believe that routes in the scratchpad can be (based on the below) be Unconfirmed (as in, under construction), or Confirmed (as in, the route is fully constructed but may or may not be exported to the FIB).
I further believe that even if a route is withdrawn from the FIB, but still has a status of Confirmed, it should not be expunged from the scratchpad but should be held in reserve in case the route that has been exported becomes faulty.
Regards
John
On 3 Jun 2015, at 12:01, Victoria Mercieca <vmercieca0@xxxxxxxxx
<mailto:vmercieca0@xxxxxxxxx>> wrote:
Hi Lotte,
You are right, it would be better to explicitly define it, and we
should incorporate this text.
Kind regards,
Vicky.
On Wed, Jun 3, 2015 at 9:39 AM, Lotte Steenbrink
<lotte.steenbrink@xxxxxxxxxxxx
<mailto:lotte.steenbrink@xxxxxxxxxxxx>> wrote:
Hi all,
while implementing Unconfirmed routes, I had a bit of a hang
up with section 6.5.2., which says:
If the RteMsg containing AdvRte is a RREQ, the route is not yet
confirmed. It should be stored, so that a corresponding
RREP can be
sent, but should not be used to forward data. If there is
already a
matching route, this new route should be saved as an
additional route
using the process below, and can replace the original route
when
adjacency with the next hop is confirmed.
Because there is no mention of the word Unconfirmed, I first
missed this part while searching through the Draft for cues
how to implement Unconfirmed routes...
I'm wondering, would it make sense to explicitly write down
the process hinted at above? After all, it is a routing table
,not a FIB... It could have several entries for one route. So
the process could be something like this:
- if no other route exists and the RteMsg is a RREQ, add the
entry and set it to Unconfirmed.
- if another route exists and the RteMsg is a RREQ, add
another entry and set it to Unconfirmed
- if other route(s) exist and the RteMsg is a RREP:
- if the only other route is Unconfirmed, set it to
confirmed.
- if there is an Active/Idle/Invalid route and an
Unconfirmed route, set the Unconfirmed route and expunge the
old Active/Idle/Invalid route.
(maybe the third point plus subpoints could also be woven into
section 6.5.1.)
Regards,
Lotte
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