BGP VPNv4 add-path is a unique feature of IOS XR. IOS-XE and NX-OS platforms do not support it.
{% tabs %}
{% tab title="ASBR" %}
{% hint style="warning" %}
retain route-target all is critical for ASBRs to accept all route-targets.
{% endhint %}
router bgp {{ ASN }}
address-family vpnv4 unicast
additional-paths receive
additional-paths selection route-policy {{ POLICY_NAME }}
retain route-target all
!
route-policy {{ POLICY_NAME }}
set path-selection backup 1 install
end-policy{% endtab %}
{% tab title="PE" %}
{% hint style="info" %}
PE routers do not have retain route-target all command.
{% endhint %}
router bgp {{ ASN }}
address-family vpnv4 unicast
additional-paths receive
additional-paths selection route-policy {{ POLICY_NAME }}
retain route-target all
!
route-policy {{ POLICY_NAME }}
set path-selection backup 1 install
end-policy{% endtab %}
{% tab title="IOS XR RR" %} {% hint style="info" %} Supported on XR-based route-reflectors only. {% endhint %}
router bgp {{ ASN }}
address-family vpnv4 unicast
additional-paths send
additional-paths selection route-policy {{ POLICY_NAME }}
!
route-policy {{ POLICY_NAME }}
set path-selection all advertise
end-policy{% endtab %} {% endtabs %}