From: JackZhang (jack@xxxxxxxxxxx)
Date: Sat May 13 2000 - 12:42:27 GMT-3
Kevin,
The nightmare of each routing protocols is Route Looping, to avoid this, every
routing protocol will have some methods set.
According to BGP, if A learned the IBGP route from B (redistributed from RIP),
A will check its routing table to see if this route could be reached via other
IP routing protocols, if it couldn't, then A will not send this route to it's E
BGP neighbor (assume it's C). Otherwise if C learned this route from A and will
send traffic to A, actually, A did not have route to reach the dest. The traff
ic then will be discarded.
you can call me to discuss.
Jack
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Kevin Young
Sent: Saturday, May 13, 2000 7:08 PM
To: ccielab
Subject: BGP question
Hi,guys, there is a question puzzled me.
Halabi'book said synchronization within an AS is IBGP peer check for the exi
stence of the destination in the IGP,to dicide to whether announce it to other
EBGP peers,
Does it also influence the bgp route which learn from other IBGP peer enter int
o itself's route table?
this is the phenomenon , A and B are IBGP peer, B redistributing RIP routes
into BGP,then B advertise the routes to A, I can see the routes in A's BGP tab
le, but couldn't see them in A's route table, when no synchonization in A, the
routes appear in A'route table,
Why? wish someone give me light ,thanks.
**************************************
Kevin Young
Senior Network Engineer
Yinxi Electronic Information Co.,Ltd
(86)-10-82625798 x 810
**************************************
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