Static Route Configuration Examples in Cisco (IOS-XR) and Juniper for BGP aggregated prefix advertisements

In order to advertise the aggregated routes (and default routes) via BGP, it should exists in the routing table, that's the #1 rule. If these summarized routes (/16) are not existing and only smaller subnets are learned via the IGP(e.g. OSPF,IS-IS), then configure static route and next hop e.g. Null0.

Juniper:

routing-options {
    graceful-restart;
    rib inet6.0 {
       static {
          route fd41:c8be:2153:f400::/64 discard;
          route ::0/0 {
                discard;
                no-install;
    static {
        route 172.16.0.0/16 discard;
        route 0.0.0.0/0 {
            discard;
            no-install;

In display set format:
set routing-options graceful-restart
set routing-options rib inet6.0 static route fd41:c8be:2153:f400::/64 discard
set routing-options rib inet6.0 static route ::0/0 discard
set routing-options rib inet6.0 static route ::0/0 no-install

set routing-options static route 172.16.0.0/16 discard
set routing-options static route 0.0.0.0/0 discard
set routing-options static route 0.0.0.0/0 no-install

Cisco:

router static
 address-family ipv4 unicast
  0.0.0.0/0 Null0
  172.16.0.0/16 Null0
 !
 address-family ipv6 unicast
  ::/0 Null0
  fd41:c8be:2153:f400::/64 Null0


In formal:
router static address-family ipv4 unicast 172.16.0.0/16 Null0
router static address-family ipv4 unicast 0.0.0.0/0 Null0
router static address-family ipv6 unicast ::/0 Null0
router static address-family ipv6 unicast fd41:c8be:2153:f400::/64 Null0