From: Alexis Dacquay (alexis.dacquay@gmail.com)
Date: Wed Mar 12 2008 - 19:18:39 ARST
Hi Peter,
If R2 advertises by the use of network statement a prefix that it received
via an IGP, it would then apply the IGP metric to the BGP metric and would
preserve that metric when sending those prefixes to its iBGP and eBGP peers.
A prefix metric is 0 is applied when advertised by network statement from a
router that has the subnet as directly connected.
Regards,
Alexis
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Peter Svidler
Sent: 12 March 2008 20:24
To: ccielab@groupstudy.com; security@groupstudy.com
Subject: BGP Metric
Folks
I have quick question on the BGP Metric
does the BGP by default take the metric of the IGP protocol and advertise
it to the IBGP neighbors ?
for example , i have domain where im running ISIS between say 3 routers
(R1 R2 R3 ) , R3 is advertising certain route to R2 via ISIS
assume R2 is running IBGP to R1 , R2 uses network command to advertise to
R1 the route received from R3
the question is , will R2 advertise that route to R1 with BGP metric equal
to the ISIS metric by default ???
this is what is happening in the scenario , but my previous knowledge was
that it should not happen by default ..so which is correct ?
thanks
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