HP StorageWorks MSA 2/8 HP StorageWorks ISL Trunking V3.1.x/4.1.x User Guide ( - Page 45

Frequently Asked Questions About ISL Trunking

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Managing ISL Trunking Frequently Asked Questions About ISL Trunking Table 2 provides answers to some frequently asked questions regarding ISL Trunking. Table 2: Frequently Asked Questions about ISL Trunking Frequently Asked Question Does ISL Trunking replace Dense Wavelength Digital Multiplexing (DWDM)? Is a Trunking Master ISL the same as the Principal ISL? Is it possible to create a trunk between a switch and an edge device, such as host or storage? Is there a limit on the number of trunking groups on one switch? Are trunks automatically established when the Trunking license is activated? What happens if a Subordinate ISL fails? What happens if a Master ISL fails? Answer No, DWDM is a ring topology, and has a different function from trunking. If a DWDM ISL fails, the traffic is rerouted over alternate routes, changing the data path. No, the roles are different, even though they may apply to the same ISL. Trunking Master ISL directs traffic over a trunking group. The Principal ISL connects to the Principal Switch, which assigns domain IDs for the fabric. No, ISL Trunking is supported only for interswitch links. No, the number of trunking groups that can be implemented on a switch are limited only by the number of available ports. Yes, if eligible ISLs exist, trunking capability is enabled by default on each port. The traffic is redistributed over the remaining ISLs in the group. There is a pause in the I/O as a new Master ISL is designated and traffic is redistributed. ISL Trunking Version 3.1.x/4.1.x User Guide 45

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Managing ISL Trunking
45
ISL Trunking Version 3.1.x/4.1.x User Guide
Frequently Asked Questions About ISL Trunking
Table 2
provides answers to some frequently asked questions regarding ISL
Trunking.
Table 2:
Frequently Asked Questions about ISL Trunking
Frequently Asked Question
Answer
Does ISL Trunking replace Dense
Wavelength Digital Multiplexing
(DWDM)?
No, DWDM is a ring topology, and
has a different function from trunking.
If a DWDM ISL fails, the traffic is
rerouted over alternate routes,
changing the data path.
Is a Trunking Master ISL the same as
the Principal ISL?
No, the roles are different, even though
they may apply to the same ISL.
Trunking Master ISL directs traffic over
a trunking group. The Principal ISL
connects to the Principal Switch, which
assigns domain IDs for the fabric.
Is it possible to create a trunk between
a switch and an edge device, such as
host or storage?
No, ISL Trunking is supported only for
interswitch links.
Is there a limit on the number of
trunking groups on one switch?
No, the number of trunking groups that
can be implemented on a switch are
limited only by the number of available
ports.
Are trunks automatically established
when the Trunking license is
activated?
Yes, if eligible ISLs exist, trunking
capability is enabled by default on
each port.
What happens if a Subordinate ISL
fails?
The traffic is redistributed over the
remaining ISLs in the group.
What happens if a Master ISL fails?
There is a pause in the I/O as a new
Master ISL is designated and traffic is
redistributed.