Re: BGP solution ?

From: Georgi Moskov (moskov_at_telecoms.bg)
Date: 01/21/04

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    Date: Thu, 22 Jan 2004 00:58:03 +0200 (EET)
To: "Gleb Smirnoff" <glebius@cell.sick.ru>

    > On Wed, Jan 21, 2004 at 01:45:09PM +0200, Georgi Moskov wrote:
    > G> I have tha following setup:
    > G>
    > G> --- B ---
    > G> / \
    > G> / \ 6802:100
    > G> 194.141.24.0/24 -- A C ----------- F
    > G> \ / 6802:200
    > G> \ /
    > G> --- D ---
    > G>
    > G> Router F advertises to router C prefixes marked widh community 6802:100
    > G> and prefixes marked with 6802:200. Is it possible to configure the
    > routers
    > G> in such a way, that traffic to/from 194.141.24.0/24 and prefixes marked
    > G> widh 6802:100 to pass through router B and traffic to/from 6802:200 to
    > G> pass through router D ? (the ruters use zebra)
    >
    > To configure incoming traffic to 194.141.24.0/24, you should create
    > route maps on C, like this:
    >
    > match community 6802:(1,2)00
    > set as path prepend XXXX XXXX
    >
    > and attach this route maps to corresponding neighbor (don't forget "out"
    > keyword).
    >
    > To deal with outgoing traffic, you should create route maps on A, like
    > this:
    >
    > match commnity 6802:(1,2)00
    > set localpref 110
    >
    > and attach them to corresponding neighbors, with "in" keyword.
    >
    > --
    > Totus tuus, Glebius.
    > GLEBIUS-RIPN GLEB-RIPE
    >
    >

    Correct me if I'm wrong but in my understanding router C can have only 1
    active path for 194.141.24.0/24 (the best one) and if so, then it will
    route traffic to it just through one of the interfaces.

    Respectfully,
    Georgi Moskov

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