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Chapter 1: About the E4G Series Routers
Combination Ports on the E4G-400 Router
The E4G-400 Cell Site Aggregation Router provides four uplink ports implemented as combination
ports that pair a copper port using RJ-45 connectors with an optical port using LC connectors. The
copper port operates as an autonegotiating 10/100/1000BASE-T port. The optical port allows Gigabit
Ethernet uplink connections through Extreme Networks small form factor pluggable (SFP) interface
modules.
The E4G-400 router supports automatic failover from an active fiber port to a copper backup or from an
active copper port to a fiber port. If one of the uplink connections fails, the uplink connection
automatically fails over to the second connection. To set up a redundant link on a combination port,
connect the active 1000BASE-T and fiber links to both the RJ-45 and SFP interfaces of that port.
Gigabit Ethernet uplink redundancy on the E4G-400 router follows these rules:
With both the SFP and 1000BASE-T interfaces connected on a combination port, only one interface
●
can be activated. The other is inactive.
If only one interface is connected, the switch activates the connected interface.
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The router determines whether the port uses the fiber or copper connection based on the order in
●
which the connectors are inserted into the router. When the router senses that an SFP and a copper
connector are inserted, the router enables the uplink redundancy feature. For example, if you first
connect copper ports 21 and 22, and then insert SFPs into optical ports 21 and 22, the router assigns
the copper ports as active ports and the fiber ports as redundant ports.
Hardware identifies when a link is lost and responds by swapping the primary and redundant ports to
maintain stability. After a failover occurs, the router keeps the current port assignment until another
failure occurs or a user changes the assignment using the CLI. For more information about configuring
automatic failover on combination ports, see the ExtremeXOS Concepts Guide.
LEDs
Table 4
describes the LEDs on the E4G-400 Cell Site Aggregation Router
Table 4: LEDs on the E4G-400 Cell Site Aggregation Router
Type/Label
Front Panel LEDs
MGMT
FAN
PSU-1, PSU-2
20
Color/State
Meaning
Steady green
Power-on self test (POST) completed successfully; normal
operation.
Blinking green
POST is in progress.
Amber
POST failed, or the system has over-heated.
Off
No external power attached.
Steady green
Normal operation.
Blinking amber
Failure.
Off
No power.
Steady green
Normal operation.
Steady amber
Power is attached, but no power is on.
Blinking amber
Failure.
Off
No power is attached.
E4G Series Routers Hardware Installation Guide
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