Aggregation in BGP 4
Hwang Hyo Jung <jung@h2o.kotel.co.kr> Fri, 21 April 1995 08:24 UTC
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From: Hwang Hyo Jung <jung@h2o.kotel.co.kr>
Subject: Aggregation in BGP 4
To: bgp@ans.net
Date: Sat, 22 Apr 1995 02:07:34 +0900 (JST)
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hi,
I have some questions about BGP 4.
Aggreagation of BGP 4 is very powerful and very useful capability.
That BGP 4 has aggreagation capability means BGP 4 aggreagate
reacheability information without aggregating routing information.
I.e. Several routing informations are flooded separately to ASBR,
in ASBR BGP 4 aggregate those informations in form of one representation.
If BGP 4 is able to send bgp information of aggreagated routes only when
IGP send aggreagated routing information, that BGP 4 cannot aggreagate
some routing informations. Am I right ??
For example, I use cisco router for BGP 4 protocol.
I found the following fact that
Router Configuration I >>
ip route 202.20.204.0 255.255.254.0 147.6.9.1
ip route 202.20.202.0 255.255.255.0 147.6.9.1
ip route 202.20.203.0 255.255.255.0 147.6.9.1
router bgp 3825
network 202.20.204.0 mask 255.255.254.0
network 202.20.202.0 mask 255.255.254.0
The result BGP table >>
*> 202.20.204.0/23 147.6.9.1 0 32768 i
-----> No 202.20.202.0/23 information
Router Configuration II >>
ip route 202.20.204.0 255.255.254.0 147.6.9.1
ip route 202.20.202.0 255.255.255.0 147.6.9.1
ip route 202.20.203.0 255.255.255.0 147.6.9.1
router bgp 3825
network 202.20.204.0 mask 255.255.254.0
network 202.20.202.0 mask 255.255.254.0
network 202.20.202.0
The result BGP table >>
*> 202.20.204.0/23 147.6.9.1 0 32768 i
*> 202.20.202.0 147.6.9.1 0 32768 i
*> 202.20.202.0/23 0.0.0.0 32768 i
-----> why is 202.20.202.0/23 appeared ?
and why is NEXT_HOP 0.0.0.0 ?
I don't understand above results with my knowledge of BGP 4.
Someone who knows or can explain what I wonder and don't know about BGP4
tell me ... Please..
Thanks in advance !!
Hyojung,
--
----------------------------------------------------------------------
@@@ Hwang, Hyojung [jung@h2o.kotel.co.kr]
@^l^@ High Speed Networking Team, Korea Telecom Research Laboratory
@@ v @@ 17, U-myun-Dong, Seocho-Gu, Seoul, Korea
>o< (Tel) 82-02-526-5235 (Fax) 82-02-526-6942
- Aggregation in BGP 4 Hwang Hyo Jung