From: Howard C. Berkowitz (hcb@xxxxxxxxxxxx)
Date: Fri May 03 2002 - 12:21:13 GMT-3
At 8:31 AM -0400 5/3/02, Jeff Duchin wrote:
>Has anyone configured a single edge router with dual OC-3 circuits to the
>same provider... announcing one summary route via BGP? I want to be able to
>utilize both pipes.
>
>Thanks,
>Jeff
I haven't done it exactly that way, but let me explain the
alternatives. When you have as much traffic as that, there's a fair
argument to be made for having dual routers to avoid a single point
of failure. In that case, split your addresses into two ranges and
advertise both the less-specific and more-specific.
Assume your address range is 172.16.0.0/15.
Router 1 advertises 172.16.0.0/15 and 172.16.0.0/16
Router 2 advertises 172.16.0.0/15 and 172.17.0.0/16
The last time I did this, the customer needed lots of conventional
T1s for voice and other applications that wouldn't go through the
router, so I terminated the OC-3's on a fully redundant Stratacom
switch, split off the T1s, and fed the data to the routers (redundant
DS-3 streams).
Today, there are T1 CBR cards for routers, so the switch might not be
necessary.
Obviously, if you're very budget constrained, you may have to use one
router. If so, use the advertisements shown above on different
interfaces. That will give you some load sharing but also protect
you against a failure of either link or interface.
PS -- Forgive me, but I can't resist. Of course, as some have
suggested here, I only do theoretical things, not mission-critical
networks like this. This must be a figment of my imagination. ;-)
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