Subject: about:draft-wilfong-ibgp-oscillations-00.txt

From: lidefeng <[email-masked]>
Date: Thu, 11 Jul 2002 09:40:14 +0800

Hi,

    In Section 3 An Extension to BGP of  draft-wilfong-ibgp-oscillations-00.txt,there is an example as to the relevant figure as follows:

 "  As an example, consider again the configuration shown in Figure 1.
   The modified BGP process will have router RR1 always announcing
   the route through C1 even though it will choose the route
   through C2 as its best route.
   Similarly, RR2 will choose the route through C3 and RR3 will
   choose the route through C1."

IMO, what you said  that RR1 will choose the route through C2,RR2 will choose the route through C3 and RR3 will
   choose the route through C1 are referred to IGP route , as to BGP,  in  the light of RFC 1771,the RR1  will reflect the route learned from C1 to
RR2 and RR3,the RR2  will reflect the route learned from C2 to RR1 and RR3, the RR3  will reflect the route learned from C3 to RR1 and RR2,
at last, every BGP route advertised by C1,C2 or C3 will reside in RR1,RR2,RR3,C1,C2,C3,and every  prefix will have three nexthops.

As to IGP, there are another scheme to compute the IGP route, if there aren't  route redistribution between IGP and BGP, the IGP route 
pattern and BGP route pattern are independent respectively, and there is little chance of route oscillation.

Li Defeng