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When OSPF neighborship forms with a software switch, it shows a cost of 100 despite how the interface (which is part of the software switch) negotiates at 1000 Mbps and references bandwidth value as 1000Mbps.
Negotiated bandwidth is 1000Mbps:
# get hardware nic <interface_name>
Speed :1000
Duplex :Full
link_status :Up
The reference bandwidth is 1000:
# config router ospf
set auto-cost-ref-bandwidth 1000
Ideally, cost should be 1. As the interface is part of the software switch, it shows cost 100:
soft_1 is up, line protocol is up
Internet Address 192.168.194.2/24, Area 0.0.0.0, MTU 1500
Process ID 0, VRF 0, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 100
This behavior makes it difficult to steer traffic appropriately.
To remediate this behavior, use a hardware switch instead of a software switch:
Hardware_1 is up, line protocol is up
Internet Address 192.168.194.1/24, Area 0.0.0.0, MTU 1500
Process ID 0, VRF 0, Router ID 1.1.1.1, Network Type BROADCAST, Cost: 1
This is the default behavior with a software switch. |
