34
Figure 46 IRF fabric in ring topology
Identifying physical IRF ports on the member switches
Identify the SFP+ or QSFP+ ports to be used for IRF connections on the member switches according to
your topology and connection scheme.
All the SFP+ and QSFP+ ports on the HP 5900AF-48XG-4QSFP+, 5900AF-48XG-4QSFP+ TAA, and
5900AF-48G-4XG-2QSFP+ switches, all the 1/10-GE Ethernet ports and QSFP+ ports on the HP
5900AF-48XGT-4QSFP+ switch, and all the SFP+ ports on the HP 5920AF-24XG and 5920AF-24XG
TAA switches can be used for IRF connections.
Follow these guidelines when you identify 1/10-GE Ethernet ports and SFP+ ports to be used for IRF
connections:
• On the HP 5920AF-24XG, 5920AF-24XG TAA, 5900AF-48XG-4QSFP+, and
5900AF-48XG-4QSFP+ TAA switches, the SFP+ ports are grouped by port number in ascending
order, starting from one. Every four SFP+ ports form one group.
• On the HP 5900AF-48G-4XG-2QSFP+ switch, SFP+ ports numbered 49, 50, 51, and 52 form one
group.
• On the HP 5900AF-48XGT-4QSFP+ switch, the 1/10-GE Ethernet ports are grouped by port
number in ascending order, starting from one. Every four 1/10-GE Ethernet ports form one group.
• All 1/10-GE Ethernet ports and SFP+ ports in the same group must be used for the same purpose
(physical IRF ports or service ports, but not both).
A common practice is to use one 1/10-GE Ethernet port or SFP+ port group for IRF connections, and
bind every two 1/10-GE Ethernet port or SFP+ ports in the group to an IRF port for increased bandwidth
and availability.
Planning the cabling scheme
For the HP 5920AF-24XG, 5920AF-24XG TAA, 5900AF-48XG-4QSFP+, 5900AF-48XG-4QSFP+ TAA,
and 5900AF-48G-4XG-2QSFP+ switches, use SFP+/QSFP+ cables or SFP+/QSFP+ transceiver
modules and fibers to connect the IRF member switches. For the HP 5900AF-48XGT-4QSFP+ switches,
use twisted pair cables, QSFP+ cables, or QSFP+ transceiver modules and fibers to connect the IRF
member switches. If the IRF member switches are far away from one another, choose the SFP+/QSFP+
IRF-port1
IRF-port2
IRF-port1
IRF-port1
IRF-port2
IRF-port2
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