Royce Mitchell III wrote:
Adam Armstrong wrote:
Carp is unnecessary when using BGP, as the provider sees routes into
your network via the individual devices and both devices see routes out.
You wouldn't want to run BGP from a CARP IP anyawys, as it would
result in BGP flapping when the CARP switched.
adam.
Okay, please forgive my ignorance, but if you have two redundant
routers servicing your BGP, how will they decide who is going to
handle a packet without some sort of CARP/VRRP communication between
them?
There are a number of mechanisms for doing this, generally you'll set
the localpref high for prefixes coming from the peer you want to use,
and set the MED low for prefixes being announced to that peer, that way
your peer will send traffic to you on the correct link (lowest MED wins)
and you'll send traffic out on the correct link (highest localpref wins).
However, if you're doing BGP solely to get redundant connectivity to the
same ISP you should look again at CARP and ask what your ISP can do by
way of HSRP/VRRP to present a single IP to you from two of their
devices. VRRP/CARP/HSRP is generally a far better solution for that due
to the slowlness of BGP convergence.
adam.
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