Configuring routing

Similar to single hub, we need iBGP sessions to each to propagate routes.

Following is a summary of how to configure routing:

1. Edit the existing overlay template, or create a new overlay CLI template. See Creating a template.
2. Define new Meta Fields for the second Hub. See Defining Meta Fields.
3. Add the template to the template group. See Adding the CLI template to the group.

Creating a template

Create (or import) another CLI Template, called 02-Edge-DualHub-Routing.

As before, this template will configure IBGP sessions to the Hubs - this time, to both of them. We will follow the same guidelines described in the previous chapter.

Here is the content of this CLI Template in our example topology:

config router static

edit 101

set dst $(lan-summary)

set blackhole enable

set comment "Avoid potential leak of corporate traffic to underlay"

next

edit 102

set dst 10.200.0.0/14

set device "H1_INET"

set comment "Cross-overlay BGP NH reachability"

next

edit 103

set dst 10.200.0.0/14

set device "H1_MPLS"

set comment "Cross-overlay BGP NH reachability"

next

end

config router bgp

set as $(as)

set router-id $(lan-net:4,1)

set keepalive-timer 5

set holdtime-timer 15

set ibgp-multipath enable

set additional-path enable

# additional-path-select = max. number of overlays * max. number of hubs

set additional-path-select 2

config neighbor

edit $(h1-inet-tunnel-ip)

set soft-reconfiguration enable

set advertisement-interval 1

set link-down-failover enable

set interface "H1_INET"

set connect-timer 1

set remote-as $(as)

set additional-path receive

next

edit $(h1-mpls-tunnel-ip)

set soft-reconfiguration enable

set advertisement-interval 1

set link-down-failover enable

set interface "H1_MPLS"

set connect-timer 1

set remote-as $(as)

set additional-path receive

next

edit $(h2-inet-tunnel-ip)

set soft-reconfiguration enable

set advertisement-interval 1

set link-down-failover enable

set interface "H2_INET"

set connect-timer 1

set remote-as $(as)

set additional-path receive

next

edit $(h2-mpls-tunnel-ip)

set soft-reconfiguration enable

set advertisement-interval 1

set link-down-failover enable

set interface "H2_MPLS"

set connect-timer 1

set remote-as $(as)

set additional-path receive

next

end

config network

edit 1

set prefix $(lan-net)

next

end

end

Defining Meta Fields

You will notice the following additional Meta Fields used:

Meta Field	Description
h2-inet-tunnel-ip	Tunnel IP of the Internet overlay on the Secondary Hub
h2-mpls-tunnel-ip	Tunnel IP of the MPLS overlay on the Secondary Hub

Navigate to System Settings > Advanced > Meta Fields, and create the missing Meta Fields listed in the table above. All the Meta Fields must be of type Device and defined as Optional.

Adding the CLI template to the group

To add the CLI template to the group:

Add the new CLI template to the group Edge-DualHub-Template created earlier.