Re: BGP router filtering

From: Albert Ip (ipwaikuen@yahoo.com.hk)
Date: Fri Jun 16 2006 - 05:56:48 ART


Sorry you guy, resend the questions...and it should be
BB2 send routes to R4 (not R6)

> Hi All,
>
>
> I have questions in BGP route filering and
> summarization below...
>
> Two ASs, AS 55 and AS 111
>
> AS 55 have three routers, R1, R3 and R4
> AS 111 have two routers, BB1 and BB2
>
> BB1 is directly connected to R4
>
>
BB1-----LAN-----R1-----FR----R3-----LAN-----R4----LAN-----BB2
>
> IP addresses:
> BB1: 150.100.1.254 (Eth0)
> BB2: 150.100.2.254 (Eth0)
> R4: 4.4.4.4 (Lo0)
>
> BB2 (e0 IP address is 150.100.2.254) advertises
> 197.68.X.0 routes to R4 (in AS 55).
>
> R4 have bgp routing table as follow...
>
> Network Nexthop LP Weight Path
> *> 197.68.0.0/20 0.0.0.0 100 32768 254 i
> *> 197.68.1.0 150.100.2.254 0 0 254 i
> *> 197.68.2.0 150.100.2.254 0 0 254 i
> *> 197.68.3.0 150.100.2.254 0 0 254 i
> *> 197.68.4.0 150.100.2.254 0 0 254 i
> *> 197.68.5.0 150.100.2.254 0 0 254 i
> *> 197.68.6.0 150.100.2.254 0 0 254 i
> *> 197.68.7.0 150.100.2.254 0 0 254 i
> *> 197.68.8.0 150.100.2.254 0 0 254 i
> *> 197.68.9.0 150.100.2.254 0 0 254 i
> *> 197.68.10.0 150.100.2.254 0 0 254 i
>
>
> Questions 1:
>
> Generate a minimum supernet address and more
> specific
> addresses to R1 and R3 (Don't using /16). So that R1
> and R3 will have supernet address point to R4 in BGP
> table.
>
> Question 2:
>
> Configure so that R1 and R3 will have that supernet
> address point to 150.100.1.254 (BB1) as nexthop. But
> 150.100.2.254 is still be alternative nexthop.
>
>
> Pls help~~~
>
>
>
>
>
>
>
> _______________________________________
> YM - Bw=u0T.'
>
>
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> http://messenger.yahoo.com.hk
>
> _______________________________________
> YM - Bw=u0T.'
>
>
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>



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