Re: bgp4-17 Section 9

["Tom Petch" <[e-mail]>]

For ensuring that advertised routes are present in the
Routing Table,
and not just in the Loc-RIB, how about

2. Introduction
..................
   To characterize the set of policy decisions that can be
enforced
   using BGP, one must focus on the rule that a BGP speaker
advertises
   to its peers (other BGP speakers which it communicates
with) in
   neighboring ASs only those routes that it itself uses,
---add--------------
that is, are present in the BGP speaker's Routing Table.
----------------
   This rule
   reflects the "hop-by-hop" routing paradigm generally used
throughout
   the current Internet.
................................

3.2 (no change needed)

9.1.2 (no change needed)

9.1.3 Phase 3: Route Dissemination
......................
   All routes
----change to-------------
that are present in both the Loc-RIB and the Routing Table
-------------------------------
 shall be processed into Adj-RIBs-Out
   according to configured policy.
........................


9.4 (no change needed)

Tom Petch, Network Consultant
[e-mail]

-----Original Message-----
From: Yakov Rekhter <[e-mail]>
To: Tom Petch <[e-mail]>
Cc: [e-mail] <[e-mail]>
Date: 14 January 2002 20:15
Subject: Re: bgp4-17 Section 9


>>
>> 9.1.2 Route selection now allows for the best route in
>> Loc-RIB not to be placed in the Routing table; how does
this
>> impact on the principle (2 Introduction) that a BGP
Speaker
>> should only advertise routes it itself uses?  Is it
enough
>> for the route to be in Loc-RIB and not in the Routing
Table?
>>
{paragraph omitted - covered in previous e-mail}
>
>Please propose the specific changes.
>
>Yakov.

{ plus an earlier reply from Alex to me}

> Tom,
>
> > 9.1.2 Route selection now allows for the best route in
> > Loc-RIB not to be placed in the Routing table; how does
this
> > impact on the principle (2 Introduction) that a BGP
Speaker
> > should only advertise routes it itself uses?  Is it
enough
> > for the route to be in Loc-RIB and not in the Routing
Table?
>
> The principle implies that the route is both in Loc-RIB
and
> in the routing table, i.e., it needs to be both selected
as
> the best and used by the router.
> However, we can only specify so much about the routing
table,
> as it is (strictly speaking) outside of the scope of the
BGP
> protocol and administrator do have the "filter" rope in
> their hands. Section 3.2 also talks about this.
>