Folks
A quick question on external BGP connection configuration.
Given an organisation (ORG) with 2 EBGP routers (up1, up2) and two upstream
providers (pr1, and pr2) where provider pr1 is currently linked to the
router up1 via a serial link and provider pr2 is currently linked to router
up2 via a traffic shaped and limited ethernet link. ORG is does not allow
transit between the providers.
Is there any reason why ORG should not
a) connect pr1 to the same ethernet segment
b) form bgp neighbor relationship with BGP peer at provider pr2
c) advertise appropriate MED values requesting that pr2 prefer up2
d) set local preference to prefer link via up2 to pr2 over up1 to pr2
What I am looking for is technical (or business/political) reasons why this
is a good or bad idea.
I understand that all this would give is redundancy at the router level
(up1, up2), the ethernet link and pr2's router are all still potential
single points of failure. I also understand that pr2 may not wish to allow
such a configuration.
Also, what would need to be done to ensure that any changes made would not
have any impact on decisions regarding the routing choice between pr1 and
pr2?
Regards
Peter
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=62860&t=62860
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