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Posts Tagged ‘ospf’

Auto-cost Reference Bandwidth

Overview: Auto-cost Reference Bandwidth is the command used to modify the OSPF metric.   Study Notes: Auto-cost reference bandwidth is used to modify the OSPF metric The OSPF metric is cost Cost is calculated by dividing 100 by the bandwidth in Mbps Cost = 100/(bw in Mbps) Any result less than 0 will use a […]


Passive Interface

Overview: A passive interface prevents sending OSPF messages out interfaces that are not connected to another OSPF router.   Study Notes: Passive interfaces help to more efficiently use bandwidth Passive interfaces help to more efficiently use router resources Passive interfaces lessen the security risk Passive interfaces can be set per interface that is enabled for […]


CCNA 3.10: Configure, verify, and troubleshoot single area and multi-area OSPFv3 for IPv6

Overview: OSPFv3 has the same functionality as OSPFv2, but uses IPv6 addresses to communicate with OSPFv3 peers.   Study Notes: OSPFv3 uses the same SPF algorithm as OSPFv2 OSPFv3 has a separate process than OSPFv2 OSPFv3 maintains separate neighbor tables, topology tables and routing tables from OSPFv2 Similarities Link State SPF algorithm Metric is cost […]


CCNA 3.9: Configure, verify, and troubleshoot single area and multi-area OSPFv2 for IPv4

Overview: Open Shortest Path First version 2 (OSPFv2), is a non-proprietary link-state routing protocol that is typically used within an autonomous system (otherwise known as an interior gateway protocol).  The v2 simply means you are using IPv4 addresses.   Study Notes: OSPF is a Link-state routing protocol Dijkstra’s Shortest Path First algorithm is used to […]


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