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Oct 31 2010   6:36PM GMT

OSPF from CCNA- ICND2 perspective – Series 2



Posted by: Yasir Irfan
CCNA tips, Classless Inter-Domain-Routing (CIDR), Dijkstra algorithm, Distance vector protocols, how OSPF works?, ICND2 certification exam, ICND2 tips, ink state protocol, IPv4 networks, IPv6 networks, Open Shortest Path First (OSPF), OSPF, OSPF from CCNA- ICND2 perspective, OSPFv2, OSPFv3, RIP1, RIP2, Variable-Length Subnet Masking (VLSM)

Most people were introduced to OSPF as the first link-sate routing protocol and some of the features of OSPF are as follows,

  • Consists of areas and autonomous systems
  • Minimizes routing update traffic
  • Allows scalability
  • Supports VLSM/CIDR
  • Has unlimited hop count
  • Allows multi-vendor deployment (open standard)

Do know these features well from CCNA point of view.

The below table compares OSPF with the distance vector routing protocols like RIP1 and RIP2

Characteristic OSPF RIP2 RIP1
Type of protocol Link state Distance vector Distance vector
Classless support Yes Yes No
VLSM support Yes Yes No
Auto-summarization No Yes Yes
Manual summarization Yes No No
Discontiguous support Yes Yes No
Route propagation Multicast on change Periodic multicast Periodic broadcast
Path metric Bandwidth Hops Hops
Hop count limit None 15 15
Convergence Fast Slow Slow
Peer authentication Yes Yes No
Hierarchical network Yes (using areas) No (flat only) No (flat only)
Updates Event triggered Route table updates Route table updates
Route computation Dijkstra Bellman-Ford Bellman-Ford
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