[Nfd-dev] Fwd: [NFD - Task #2010] RIB cost guidelines

[Syed Obaid Amin]

The similar problem in IP is solved by Administrative Distance (AD), I
think we can use the same approach here?

Obaid

On Thu, Oct 16, 2014 at 12:54 PM, Lan Wang (lanwang) <lanwang at memphis.edu>
wrote:

>  I don't have a good answer to this question.  I suggest that we discuss
> this at the next nfd call.
>
>   Lan
>
>
> Begin forwarded message:
>
>  *From: *<redmine-noreply at named-data.net>
>  *Subject: **[NFD - Task #2010] RIB cost guidelines*
>  *Date: *October 7, 2014 11:49:34 AM CDT
>  *To: *Undisclosed recipients:;
>
>  Issue #2010 has been updated by Junxiao Shi.
>
>
> Routes can come from several sources:
>
>    - static route (manually configured by nfdc register)
>    - intra-domain routing protocol
>    - inter-domain routing protocol
>    - local application
>    - remote prefix registration (laptop registers a prefix on the access
>    router toward the laptop)
>
> The costs from all those sources are not comparable, but forwarding is
> using an order derived from those costs.
> ------------------------------
>  Task #2010: RIB cost guidelines
> <http://redmine.named-data.net/issues/2010#change-5157>
>
>    - Author: Junxiao Shi
>    - Status: New
>    - Priority: Normal
>    - Assignee:
>    - Category: Docs
>    - Target version:
>
> Provide guidelines for how routing protocols should assign RIB cost.
>
> Each routing protocol (including static) has its own way to assign costs.
> Costs from different routing protocols are not necessarily comparable.
> Forwarding does not interpret or use Cost assigned by routing protocol,
> but has access to an ordered list of nexthops in the FIB entry. This order
> is determined by the Costs of Routes, even if they could come from
> different routing protocols.
>
> This Task is to provide guidelines on how routing protocols should assign
> RIB cost, so that Costs from different routing protocols can be comparable.
> Some routing protocols may use non-integer costs; the guidelines should
> recommend how to convert such costs into integers.
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