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ospf cost, bandwidth
satishtech
Member Posts: 243
in CCNA & CCENT
Could someone kindly explain. auto-cost reference-bandwidth 1000 and ip ospf cost commands in ospf I am assuming the first command specifies bandwidth and the second one specifies cost directly. cost =10^8 / Band Width.
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AwesomeGarrett
Member Posts: 257
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EdTheLad
Member Posts: 2,111 ■■■■□□□□□□
auto-cost reference-bw is specified in megabits, the default is 100 i.e. 10^8 , above you have 1000 i.e. 10^9
Which means a FE 100Mb/s interface has a cost 10^9/10^8 = 10 rather than 1 if you left the default.Networking, sometimes i love it, mostly i hate it.Its all about the $$$$ -
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OfWolfAndMan
Member Posts: 923 ■■■■□□□□□□
Reference bandwidth/interface speed
^^^This is the equation to calculate metric. By default, reference is 100 which means anything 100 Mbps or more (1 Gbps, 10 Gbps, etc), is seen as equal, which is not what we want. If you use at most 10 gig in a network, you should at least have the reference bandwidth set to 10000, or 100000 for extensibility.:study:Reading: Lab Books, Ansible Documentation, Python Cookbook 2018 Goals: More Ansible/Python work for Automation, IPSpace Automation Course [X], Build Jenkins Framework for Network Automation [] -
Optionsjames43026
Member Posts: 303 ■■□□□□□□□□
Not likely to see this on the CCNA. You are more likely to see this on the CCNP. CCNA is basic configs for routing protocols.
