Open Shortest Path First
[Note that version 1 of OSPF was never implemented.]
Origin: Based on RFC 2328
Type of protocol: Link-state, runs the Dijkstra algorithm to calculate the shortest-path first (SPF) tree
Metric: Calculates the cost to traverse router links to get to the destination, taking the bandwidth of the links into account
Methodology: Develops adjacencies with its neighbors, periodically sending hello packets to neighbors, flooding changes to neighbors when a link’s status changes, and sending “paranoia updates” to neighbors every 30 minutes of all recent link state changes
Ideal topology: Any network, small to very large
[Note that version 1 of OSPF was never implemented.]
Origin: Based on RFC 2328
Type of protocol: Link-state, runs the Dijkstra algorithm to calculate the shortest-path first (SPF) tree
Metric: Calculates the cost to traverse router links to get to the destination, taking the bandwidth of the links into account
Methodology: Develops adjacencies with its neighbors, periodically sending hello packets to neighbors, flooding changes to neighbors when a link’s status changes, and sending “paranoia updates” to neighbors every 30 minutes of all recent link state changes
Ideal topology: Any network, small to very large
Strengths:
·
Converges
quickly, compared to a distance vector protocol
·
Routing
update packets are small, as the entire routing table is not sent
·
Not
prone to routing loops
·
Scales
very well to large networks
·
Recognizes
the bandwidth of a link, taking this into account in link selection
·
Supports
VLSM or CIDR
·
Supports
a long list of optional features that many of the other protocols do not
Weaknesses:
·
More complex to configure and understand than a
distance vector protocol
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