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  • 1.  8320 / 5400 OSPF cost command?

    Posted Apr 22, 2019 04:48 PM
    Hi,

    I’m looking for a command to adjust the default OSPF cost reference on my 8320 / 5400 Aruba switches.

    What’s the simplest way to change this to account for a mixture of 1gig and 10gig links?

    Thanks


  • 2.  RE: 8320 / 5400 OSPF cost command?
    Best Answer

    Posted Apr 23, 2019 08:22 AM

    On 5400R it is recommended to use the "ip ospf cost"command.

    On 8320, the command is under rotuer ospf:

    "reference-bandwidth", the default being  100000Mbps. (cost = ref_bw / interf_bw).

    Please note that reference BW is something you may use when routed links are Routed-ports, not VLANs. For a VLAN, the associated OSPF link speed is defined as 1Gbps. If you use transit/interco VLANs, it is best to use ip ospf cost, to better control your routing cost.

    If you only use Routed-ports, then keeping the default refence-bw is fine for 1G and 10G ports.



  • 3.  RE: 8320 / 5400 OSPF cost command?

    Posted Apr 23, 2019 09:00 AM
    Thanks - looks like the default for 8320 is 100Gbps then? Plenty to cope with little 1 and 10 gig links :-)