Hi
Hate to bump my own post but does anyone have any thoughts on the below?
Thanks
David
...
On 28/07/2009, at 10:11 AM, David Hughes wrote:
Hi
I have a situation that looks like a problem in the making. In a
subset of our network there's a pair of well connected datacentres
(eg dual 10GE paths etc). One of our upstreams will shortly be
presenting a transit path at both of these 2 locations. No problems
I think to myself - we'll just multi-path from our core and load
share over both paths.
Problem. Seeing as the 2 border routers in question are at
different locations, the core routers see different IGP metrics to
the nexthop of the BGP table entry. As a result they are excluded
from use with BGP multipath and I'm left with the core routers at
each DC only using the paths to the border router at the local site.
I don't want to mess around with tweaking the OSPF metrics as I'm
sure that's just a disaster waiting to happen for some poor network
engineer in a year or two. I thought I'd found a nice clean
solution with Cisco's "multipath unequal-cost" feature but for some
reason I can't even start to understand you can only use it in a
VRF, not in the default table.
So the only solution I can see is to reconfigure the core devices
and move all interfaces and routing processes into a VRF so that I
can effectively get this feature on our entire table.
What am I missing here? Surely I'm not Robinson Crusoe - someone
must have done this before. Platform is Cat6k / Sup720.
Thanks
David
...
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