Adam Armstrong wrote:
Royce Mitchell III wrote:
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.
This client has two ISP's, and wants to setup BGP so he can reroute a
/24, but he wants redundant routers to service the BGP so that if one
goes down he still has both ISPs. So, both routers will respond to both
legs of the of the BGP route.
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