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

[Lan Wang (lanwang)]

On Oct 16, 2014, at 2:20 PM, Dave Oran (oran) <oran at cisco.com> wrote:

> 
> On Oct 16, 2014, at 3:05 PM, Syed Obaid Amin <obaidasyed at gmail.com> wrote:
> 
>> The similar problem in IP is solved by Administrative Distance (AD), I think we can use the same approach here? 
>> 
> “Solved” is somewhat of an overstatement. Perhaps a gross overstatement.

What problems does AD have in your experience?

Lan
> 
>> 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
>>> 	• 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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>> 
>> 
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>