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Which configuration accomplishes this goal?

— Exhibit –

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In the exhibit, a customer wants to configure an EBGP connection to two different routers in a
neighboring autonomous system. The goal of this configuration is to use per-prefix load balancing
across both EBGP links.
Which configuration accomplishes this goal?

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A.
{master:0}[edit]
user@router# show protocols bgp
group External {
multihop;
peer-as 65532;
neighbor 10.10.2.2;
neighbor 10.20.2.2;
}

B.
{master:0}[edit]
user@router# show protocols bgp
group External {
multipath;
peer-as 65532;
neighbor 10.10.2.2;
neighbor 10.20.2.2;
}

C.
{master:0}[edit]
user@router# show protocols bgp
group External {
multihop;
local-address 192.168.2.1;
peer-as 65532;
neighbor 10.10.2.2;
neighbor 10.20.2.2;
}
user@router# show routing-options
static {
route 0.0.0.0 next-hop [ 10.10.2.2 10.20.2.2 ];
}
autonomous-system 65432;

D.
{master:0}[edit]
user@router# show protocols bgp
group External {
multihop;
local-address 192.168.2.1;
peer-as 65532;
multipath;
neighbor 10.10.2.2;
neighbor 10.20.2.2;
}
user@router# show routing-options
static {
route 0.0.0.0 next-hop [ 10.10.2.2 10.20.2.2 ];
}
autonomous-system 65432;

One Comment on “Which configuration accomplishes this goal?

  1. mike says:

    Option D is tricky. Anything learned through BGP more specific than 0/0 will be also load balanced as shown in option B, including the 0/0 route. It makes both B and D correct answers. However D is showing more configuration than necessary for completing the question and therefore I guess B was selected as correct.

    P.S. The load balancer config is omitted from all answers… Let’s assume it is already applied.




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