From: Howard C. Berkowitz (hcb@xxxxxxxxxxxx)
Date: Mon Apr 29 2002 - 17:05:27 GMT-3
At 3:08 PM -0400 4/29/02, Peter van Oene wrote:
>In this case, I'll stick to my original point. The question is
>flawed. First off, why are you trying to use an EGP for IGP
>reachability? Further, synch has nothing to do with it as far as I
>can tell. Synch refers to whether or not a router will advertise
>(read post as valid in the local rib and pass through adj-rib-out
>export type policies) a particular prefix to an EBGP peer. With no
>EBGP peers, synch is irrelevant.
>
>In your example, you don't have reachability because you shouldn't.
>The routes don't synch because they shouldn't. I really hope the
>ccie lab hasn't degenerated to this extent. This is so far
>backwards its beyond comprehension.
>
>(and I'm half way into that beer)
Let us put this into perspective.
1. RFC 1403 style BGP-OSPF interaction is obsolete.
2. Sync is a Cisco-only technique invented when it was assumed there was
full redistribution from BGP into the IGP for transit networks. With
the advent of pervasive BGP and/or iBGP scalability methods, it became
obsolete.
3. The sync knob is still used in some Cisco networks, so I suppose a
support exam might test for its bizarre use.
But for the perspective...
A customer, whom we shall call Sven, finally accumulated the money to
buy something he always wanted, a custom-made business suit. He
searched for the right tailor, and finally selected George.
Sven went in, and was measured by George. He returned a few weeks
later to try on the suit.
Looking in the mirror, Sven immediately complained "look! the right
sleeve is too long!" And George said "no problem. Here." He adjusted
Sven's shoulder to push up a little. "See? With your shoulder up,
perfect!"
Sven then said "It's too loose in the rear". And George told him to
lean backwards and squat a bit, and again the suit fit perfectly.
Sven next pointed out that the left leg was a little too long, and
ballooned out at the knee. George explained to Sven how to bend his
left knee, and the suit fell into place. Now it looked perfect.
Sven staggered out into the street, right shoulder hunched up,
squatting, and limping on a bent knee. He hadn't walked far before a
stranger ran up and said "I must know who your tailor is!"
Sven grinned and decided it had been worth it. He asked, "do you like it?"
The stranger said, "If he can fit a cripple like you this well, he
must be a genius!"
BGP itself, in its present incarnation, is increasingly like a suit
tailored by George. BGP in the CCIE lab is like a suit tailored by
George when George had a hangover.
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