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Which configuration accomplishes this goal?

— Exhibit –

— Exhibit —
Click the Exhibit button.
A customer is trying to configure a router to peer using EBGP to a neighbor. As shown in the
exhibit, two links are being used for this configuration. The goal of this configuration is to loadbalance traffic 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;
local-address 192.168.2.1;
peer-as 65532;
neighbor 10.10.2.2;
neighbor 10.20.2.2;
}
{master:0}[edit]
user@router# show routing-options
static {
route 192.168.5.1/32 next-hop 192.168.2.1;
}
autonomous-system 65432;

B.
{master:0}[edit]
user@router# show protocols bgp
group External {
multihop;
local-address 192.168.2.1;
peer-as 65532;
neighbor 192.168.5.1;
}
{master:0}[edit]
user@router# show routing-options
static {
route 192.168.5.1/32 next-hop [ 10.10.2.2 10.20.2.2 ];
}
autonomous-system 65432;
forwarding-table {
export load-balance;
}
{master:0}[edit]
user@router# show policy-options policy-statement load-balance
term balance {
then {
load-balance per-packet;
accept;
}

C.
{master:0}[edit]
user@router# show protocols bgp
group External {
multi-path;
local-address 192.168.2.1;
peer-as 65532;
neighbor 192.168.5.1;
}
{master:0}[edit]
user@router# show routing-options
static {
route 192.168.5.1/32 next-hop [ 10.10.2.2 10.20.2.2 ];
}
autonomous-system 65432;

D.
{master:0}[edit]
user@router# show protocols bgp
group External {
multipath;
local-address 192.168.2.1;
peer-as 65532;
neighbor 10.10.2.2;
neighbor 10.20.2.2;
}
{master:0}[edit]
user@router# show routing-options
static {
route 192.168.5.1/32 next-hop 192.168.2.1;
}
autonomous-system 65432;

2 Comments on “Which configuration accomplishes this goal?

  1. mike says:

    It shows B as correct answer, and it is the most reasonable answer indeed, however when you think about it, without the multipath option one of two identical routes received from the peering AS will be immediately put to inactive state.
    So, load-balance filter is fine, but we need multipath option too. I assume this is a glitch from the real test where the multipath will be used in B answer.

    http://www.juniper.net/documentation/en_US/junos12.2/topics/topic-map/bgp-multipath.html




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    1. koraa says:

      As peering is done using loopback interfaces, and per-packet load balancing is configured, I think multipath is not required.

      JUNOS supports load balancing via three different methods :

      EBGP load balancing using the multipath statement

      IBGP load balancing using the multipath statement

      EBGP load balancing using the multihop statement
      —-




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