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OSPF ABR will not generate default LSA to stub area when area 0 has only one router

June 27, 2016 by Marques Brownlee

How to inject a default route to address the OSPF area border router (ABR) not generating a default link-state advertisement (LSA) to stub area when area 0 has only one router. When area 0 has only one router, OSPF ABR will not generate default LSA to stub area. We need to inject default route to stub area. Topology: SRX240A(ge-0/0/2)---|---(ge-0/0/2)SRX240B … [Read more...]

Filed Under: Juniper Tagged With: ABR, area border router

When configuring OSPF in a VRF for Customer routes

June 3, 2016 by James Palmer

When configuring OSPF in a VRF for Customer routes you need to be aware that the VRF will create the OSPF instance as an ABR (Area Boarder Router) When OSPF is configured in a VRF it will be created as an ABR. This may prevent summary and external routes from being put in the VRF routing table when OSPF is not part of Area 0 For example if you configure the VRF with OSPF … [Read more...]

Filed Under: Juniper Tagged With: ABR, Area Boarder Router, OSPF, Virtual Router, Virtual Routers, VRF, VRF routing table

OSPF: Behavior of the default route that an ABR advertise to a stub area when the ABR is set to overload.

June 1, 2016 by James Palmer

OSPF: Behavior of the default route that an ABR advertise to a stub area when the ABR is set to overload. The router will not poison the default route metric after the router became overload. Example Show route taken from a OSPF stub router before the ABR is set to overload. # run show route inet.0: 14 destinations, 14 routes (14 active, 0 holddown, 0 hidden) + = … [Read more...]

Filed Under: Juniper Tagged With: ABR, OSPF

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