Because when you redistribute a routing protocol like BGP into EIGRP, you
must specify a metric. Metrics in BGP are meaningless in EIGRP. I mean
if a route has a local pref of 100, a weight of 100, and a AS PATH of 100
200, how is eigrp to deal with that? EIGRP understand load, reliability,
mtu, etc. so you must put it into a form EIGRP can understand.
Their is no "automatic" way to convert BGP metrics to EIGRP metrics. In
some redistribution situations you don't have to worry about specifying a
metric.
You can specify the metric the BGP routes should have within the EIGRP
process on the same line as the "redistribute" line. Or you can specify a
"default-metric" line which will apply to the redistributed routes.
Either one would be a valid way of doing this. You don't have to have
"default-metric" instead you could have specified the metric on the
"redistribute" line.
If you redistrbute routes into a distance vector proctocol, and it
doesn't understand the metrics of the foreign protocol, then it assigns
"-1" which is definitly not what you want.
Read a good chapter on route-redistribution, perhaps Routing TCP/IP (an
excellent source on this), and it will clear your mind.
Brian
On Sat, 2 Dec 2000, Frank Wells wrote:
> Just did the Fatkid Basic BGP lab #320. I am trying to understand why I
> needed the command default-metric 64000 2 225 1 1500 under the eigrp 1
> process on router 4. I could not advertise the 10.0.0.0 network from
> router4 to the other members of AS 200 until I used it. I just want to hear
> some explanantions as to why. What default-metric did this command change ?
>
> Thanks a lot
>
> http://www.fatkid.com/html/320_basic_bgp.html
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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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