IBM SAN256B-6, Инструкция по установке, обслуживанию и эксплуатации

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QSFP ports are numbered from 0 through 3 along the top row from right to left and 4 through 7 along
bottom row from right to left. For information on supported QSFP transceivers, refer to “Supported
transceivers and cables” on page 65.
Ports belonging to the same trunking groups are indicated with the same color border under the ports.
These colors are also applied to the port map labels on each blade to indicate ports belonging to the same
trunking groups.
Each numbered QSFP port on the blade provides four 32 Gbps FC ports. The following table shows the
mappings from the numbered QSFP ports on the face of the core blade to the individual FC port
numbers as shown by the
slotShow command.
Table 27. External port to slotShow port mapping for core blades
External port number slotShow FC port numbers
0 0-3
1 4-7
2 8-11
3 12-15
4 16-19
5 20-23
6 24-27
7 28-31
ICL trunking groups
Multiple directors can be connected through inter-chassis links (ICLs) between 4x32-Gbps QSFPs on core
routing blades installed in these devices. Each QSFP connection between two devices provides 128 Gbps
bandwidth. Trunking optimizes the use of ICL bandwidth by allowing a group of links to merge into a
single logical link, called a trunk. Traffic is distributed dynamically and in order over this trunk,
achieving greater performance with fewer links. Within the trunk, multiple physical ports appear as a
single port, thus simplifying management. Trunking also improves system reliability by maintaining
in-order delivery of data and avoiding I/O retries if one link within the trunk fails.
Each QSFP provides four 32 Gbps FC ports. Since each port within a QSFP terminates on a different ASIC
within each core blade, an ICL trunk cannot be formed using the individual FC ports within the same
QSFP. A trunk has to be formed from individual FC ports in different QSFP ports. These QSFP ports must
reside in the same trunk group. To form an ICL trunk between two devices, a minimum of two QSFPs
within a port trunk group on a core blade installed in one device must be connected to a pair of QSFPs
within a trunk group on a core blade in another device using ICLs.
Each CR32-4 blade on the SAN256B-6 has two ICL trunking groups consisting of the following QSFP
ports:
v 0, 1, 5, and 4
v
2, 3, 6, and 7
Ports belonging to the same trunking groups are indicated with the same color border under the ports on
the blade faceplate. These colors are also applied to the port map labels on each blade faceplate to
indicate ports belonging to the same trunking groups.
For more information on ICLs and configuring ICL trunking between core routing blades on Gen 6 and
Gen 5 Directors, refer to the "Inter-Chassis Links" in the Fabric OS Administration Guide.
126
SAN256B-6 Installation, Service, and User Guide
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