1. NSSAs are similar to the existing OSPF stub area configuration option but have the additional capability of importing AS […]
Archive for ‘OSPF Routing Protocol’
Why In DMVPN Phase 2 it is recommended to use OSPF Broadcast Network Type instead of Point to MultiPoint?
In DMVPN Phase 2 and in order to achieve spoke to spoke connectivity, when using OSPF Routing Protocol, the recommendation […]
What is OSPF Type-4 LSA?
This Type LSA has always been confusing to many people. This LSA describes the metric that the ABR uses to […]
Why an NSSA ABR does not inject a default route automatically into NSSA unlike with stub area ?
Why an NSSA ABR does not inject a default route automatically into NSSA unlike with stub area ? In this […]
OSPFv3 Link-State Database In-Depth Lecture
Basic configuration of all routers: R1: ipv6 unicast-routing ! interface FastEthernet0/0 ipv6 address 2012:12::1/64 ipv6 enable ospfv3 1 ipv6 area […]
Why the P-bit must be cleared in the Type-7 default route by an NSSA ABR?
When an NSSA ABR originates a Type-7 default route, the P-bit must be cleared in order to tell to other […]
OSPF Database Discrepancy
You set up a VPN MPLS with your service provider in order to connect your central site to your remote […]
Why an NSSA ABR does not inject a default route automatically?
A lot engineers learns especially in CCNP course that in Stub area , an ABR injects automatically a Type-3 default […]
OSPF routing loop mechanisms
OSPF routing loop mechanisms summarized In single area, the routers have the Link State Database, having the same LSDB helps […]
Why we need OSPF Type-2 LSA in a broadcast network
The OSPF Type-2 LSA is one of the misunderstanding LSA among all the popular LSAs in OSPF , most people […]