Ah, perfect, and so obvious now that I think about it.  Easy to fix too as they 
already have an IGP on those links.

Thanks!

On 1/20/17, 12:38 PM, "Gert Doering" <[email protected]> wrote:

    Hi,
    
    On Fri, Jan 20, 2017 at 05:10:56PM +0000, David Hubbard wrote:
    > Hello all, I have a setup where one BGP AS exists at two physical 
locations, with an edge router at each location peered to different upstreams.  
The two edge routers are interconnected with a 40gig and 10gig link, each with 
its own interface/address, so there are two iBGP sessions between the same two 
routers.  The intent of the 10gig is only to be used as backup, and when I 
first brought it up, the routers of course began treating them as equal cost 
paths (from BGP perspective) and used both.  The way I initially worked around 
that was via a route map on both sides that assigns a higher non-default weight 
to advertisements coming in via the iBGP session on the 40gig link.
    
    "The normal way" to do iBGP is "between loopbacks" and have an IGP 
    distribute loopback reachability across available links.
    
    Which will automatically achieve what you're asking for :-) 
    
    gert
    -- 
    USENET is *not* the non-clickable part of WWW!
                                                               
//www.muc.de/~gert/
    Gert Doering - Munich, Germany                             
[email protected]
    fax: +49-89-35655025                        
[email protected]
    

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