Juniper EX4100 Hardware Manual page 52

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Table 7: Cloud LED on EX4100 and EX4100-F Switches
Colors Status
The switch is connecting to the cloud.
The DHCP server has not allotted an IP address to the
switch, or no IP address is configured on the switch.
The DHCP server has not allotted a gateway IP address
to the switch, or no gateway IP address is configured
on the switch.
The gateway IP address is not reachable.
The switch cannot find a DNS server.
The DNS server does not respond.