EIGRP summarization Summarization can be employed on any router in an EIGRP network, since it is a distance-vector protocol and does not keep a LSDB on all routers on the network. Summary routes in EIGRP have an AD value of 5. The summary router will advertise the summary route with an outgoing interface of Null0… read more »
There are a number of different packet types used by OSPF these are typically Hello packets, and the different LSA types; LSA Type 1 Router LSA The router will announce its presence and list the links to other routers/networks in the same area along with metrics to them. Type 1 LSAs do not cross into… read more »
Network Types OSPF network types control: How hellos and updates are sent Who forms an adjacency How the next-hop is calculated Point-to-Point The simplest network type. As the name suggests is simply a link between two routers. A packet sent from one router, can only ever go to the one recipient on a point-to-point network. … read more »
OSPF discovers and maintains neighbor relationships by using Hello packets. These are sent at regular intervals on interfaces participating in the OSPF routing process. Hello packets are sent to the multicast address 224.0.0.5 (IPv6 FF02::5). The two timers used are: Hello interval: this defines how often we send the hello packet. Dead interval: this defines… read more »
OSPF Basic OSPF supports adjacency authentication to protect control plane E.g. prevent against routing injection attack Every OSPF packet header includes authentication information I.e. Hello, LSU, LSR, etc. Authentication does not mean encryption OSPFv2 payload is still clear text OSPFv3 supports IPsec encryption Types of authentication (3) Type 0 – Null Type 1 – Simple… read more »