4-47
Chassis
Candidate physical IRF ports
Use restrictions
LI
S5120V3-12TP-HPW
R-LI
S5120V3-28P-HPWR
-LI
S5120V3-28P-PWR-
LI
S5120V3-52P-PWR-
LI
S5120V3-28P-SI
S5120V3-52P-SI
Planning the cabling scheme
Use the following cables to connect the IRF physical ports on the switches:
•
10/100/1000BASE-T autosensing Ethernet port
—Category 5 or above twisted-pair cables.
•
1000/100BASE-T autosensing Ethernet port and 2.5G/1000/100BASE-T autosensing
Ethernet port
—Category 5e or above twisted-pair cable.
•
SFP port
—GE SFP fiber transceiver modules and optical fibers or GE SFP cables. For the
available models, see ports in
S5120V3-EI & S5120V3-LI & S5120V3-SI Switch Series
Hardware Information and Specifications
.
•
SFP+ port
—SFP+ fiber transceiver module and optical fiber or SFP+ cable. For the available
transceiver models and cables, see ports in
S5120V3-EI & S5120V3-LI & S5120V3-SI Switch
Series Hardware Information and Specifications
.
If the IRF member switches are far away from one another, use SFP/SFP+ transceiver modules and
optical fibers. If the IRF member switches are all in one equipment room, use twisted pair cables or
SFP/SFP+ cables.
The following subsections describe several H3C recommended IRF connection schemes by using
SFP+ cables and SFP+ transceiver modules and fibers. All these schemes use a ring topology.
IMPORTANT:
In these schemes, all physical IRF ports are located on the same side. If physical IRF ports are on
different sides, you must calculate or measure the required cable length.
Connecting the IRF member switches in one rack
Connect the IRF member switches (four switches in this example) in a rack as shown in
The switches in the ring topology (see
) are in the same order as connected in the rack.
Figure4-4 Connecting the switches in one rack
1
2
3
4
