Hello,
If You receive 0/0 and ::/0 from Your ISP, You don't need to bother about generated routes.
Generally speaking, creating 0/0 generated route is more pain than it's worth because with incessant BGP route churn in the wider internet, JUNOS RPD is going to be constantly reevaluating contributors (something like 800K contributors!) and reselecting the best numerically lowest contributor to make this contributor' nexthop the generated route' nexthop.
Ditto for ::/0 generated route, albeit with lesser contributors but they are growing.
@biraj wrote:
We are not running IBGP internally, so have rely to OSPF.
This is a MAJOR disadvantage because without iBGP, You can only run internet in GRT and LDP-based MPLS services such as LDP VPLS and L2circuits. And that's all.
All other services (L3VPN, L2VPN, EVPN, flowspec etc) use BGP so I'd say start planning for iBGP before Your network grows large.
HTH
Thx
Alex