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Inter-Switch Link (ISL) Trunking
Installing SFP+ transceivers and connecting cables
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switch:admin> tsclockserver "10.32.170.1;10.32.170.2;ntp.localdomain.net"
Updating Clock Server configuration...done.
Updated with the NTP servers
Changes to the clock server value on the principal or primary FCS switch are
propagated to all switches in the fabric
ISL Trunking is optional software that allows you to create trunking group of ISLs
between adjacent switches. Up to eight FC ports on the SAN48B-5 can be used as a
trunking group to achieve speeds up to 128 Gbps (256 Gbps full duplex) for
optimal bandwidth utilization and load balancing. For more information about
Brocade ISL Trunking, see the Fabric OS Administrator's Guide.
The SAN48B-5 only supports Brocade-branded SFP+ optical transceivers. For the
Fibre Channel connections, the switch uses SFP+ transceivers that support any
combination of Short Wavelength (SWL), Long Wavelength (LWL), and Extended
Long Wavelength (ELWL) optical media. This switch will accept both 16 Gbps and
8 Gbps SFP+ transceivers.
Attention: Use only transceivers that are supported for this product. Only
transceivers purchased from IBM are supported. The use of transceivers that are
not supported may cause data loss or cause the product to malfunction. For a
listing of transceivers compatible with this product:
v Go to the IBM Support Portal www.ibm.com/supportportal.
v In the Search field, enter b-type supported transceiver.
v Alternatively, use this direct link: http://www-01.ibm.com/support/
docview.wss?uid=ssg1S1004421.
If you use an unqualified transceiver, the switchShow command output shows the
port in a Mod_Inv state. Fabric OS also logs the issue in the system error log.
Attention: With increasing speeds of optical connections, the cleanliness of the
connections assumes greater importance in ensuring maximum performance and
error free transmission. Due to the tighter tolerances associated with state of the art
optics, levels of contamination that were acceptable at lower speeds may not be at
higher speeds. While IEC Standard 61300-3-35 specifies a set of guidelines for
trouble free performance, most issues can be avoided by adhering to the following
best practices:
v When cables or connectors are not in use for extended periods of time, use the
dust covers provided.
v Ensure that the cable length and type that is used are suitable for the speed and
application.
v Inspect and clean optical connections and fiber cables before you connect or
reconnect components.
v Ensure that cables are properly seated within the connector.
Kits are commercially available for cleaning and inspecting these connections. IBM
also offers services that will ensure optimal condition of the network.
The 16 Gbps SFP+ transceivers have an attached pull tab and no latching wire bail.
To simplify insertion of the 16 Gbps SFP+ transceivers, it is recommended to
connect the cables first, and then insert them as a unit into the port. Figure 8 on
page 20
Chapter 2. Installing and configuring the switch
19
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