Extreme Networks Alpine 3802, Hardware Installation Manual

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80 Extreme Networks Consolidated "i" and "e" Series Hardware Installation Guide
Summit Switch Models
The switch provides full-duplex support for all ports. Full-duplex allows frames to be transmitted and
received simultaneously and, in effect, doubles the bandwidth available on a link. All 10/100/1000
Mbps ports on the Summit 400-24 switch autonegotiate for half- or full-duplex operation.
Uplink Redundancy
The four fiber ports and the last four of the 10/100/1000BASE-T ports are designed as combination
ports for uplink redundancy. When a pair of ports is shared, only the fiber port or only the copper port
can be active at the same time. For example, if copper port 21 goes down while transmitting packets,
fiber port 21X activates and becomes the primary link. See Figure 30 for a diagram of these combination
ports.
The switch determines whether the port is the primary or redundant port based on the order in which
the cables are inserted into the switch. When the switch senses that cables are in both the fiber and
corresponding copper port, the switch enables the uplink redundancy feature. For example, if you insert
mini-GBICs into ports 21X and 23X first, and then connect copper ports 21 and 23, the switch assigns
ports 21 and 23 as redundant ports.
Figure 30: Shared ports on the Summit 400-24 switch
You can override the configuration and behavior of these ports through the CLI. Using the CLI, you can
set a preference for either fiber or copper. You can also turn off port redundancy using the
force option.
If a combination port fails to link, determine whether the force option is in effect. For more information
about using the CLI to set redundancy priority, see the ExtremeWare Software Users Guide .
The Summit 400-24 switch Gigabit Ethernet port failover from the fiber link to the copper link takes
4 to 5 seconds. The Summit 400-24 switch Gigabit Ethernet port failover from the copper link to the fiber
link takes 2 to 3 seconds.
Summit 400-48t switch
The Summit 400-48t switch is a compact enclosure (see Figure 31) one rack unit in height (1.73 inches or
44.0 mm) that provides 48 autosensing 10/100/1000BASE-T ports using RJ-45 connectors. The switch
also has four fiber ports that allow Gigabit Ethernet uplink connections through Extreme 1000BASE-SX,
1000BASE-LX, or 1000BASE-ZX SFP mini-GBICs using LC connectors. The four fiber ports and the first
four of the 10/100/1000BASE-T ports are designed as shared, or
combination ports for uplink
redundancy. When sharing ports, only the fiber port or only the copper port can be active at the same
Shared Ports
21 22 23 24
21X 22X 23X 24X
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