The universal 5520 switch needs some additional configuration to access the management protocols such as SSH as they are Firewalled off by a new security feature in the VOSS software, essentially configure the required management VLAN, the VLAN IP and add an IP route under NLS Configuration…
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NLS CONFIGURATION
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mgmt vlan 10
mac-offset 0
ip address 192.168.10.10/24
ip route 0.0.0.0/0 next-hop 192.168.10.1 weight 200
enable
force-topology-ip
exit