Technical data

Fabric OS Administrator’s Guide 11-3
Publication Number: 53-0000518-09
Choosing an Extended ISL Mode
11
Choosing an Extended ISL Mode
Table 11-1 lists the extended ISL modes for switches that have a Bloom ASIC. You can configure
extended ISL modes with the portCfgLongDistance command when the Extended Fabrics license is
activated.
Table 11-2 lists the extended ISL modes for switches that have a Goldeneye ASIC.
Table 11-1 Extended ISL Modes: Switches with Bloom ASIC
Mode Description Buffer Allocation Distance @ 1
Gbit/sec
Distance @ 2
Gbit/sec
Earliest
Fabric OS
Release
Extended
Fabrics
License
Required?
1 Gbit/
sec
2 Gbit/
sec
L0 Level 0 static
mode, the default.
5 (26)
a
5 (26) 10 km 5 km All No
LE Level E static
mode, supports
links beyond 5 km.
13 19 n/a 10 km v3.x, v4.x No
L0.5 Level 0.5 static
mode (designated
LM when listed
with the
portcfgshow
command).
19 34 25 km 25 km v3.1.0, v4.1.0,
v4.x, 5.x
Yes
L1 Level 1 static
mode.
27 54 50 km 50 km All Yes
L2 Level 2 static
mode.
60 64 100 km 60 km All Yes
LD
b
Dynamic mode
uses automatic
distance detection
for a user-specified
distance.
Auto Auto Auto Auto v3.1.0, v4.1.0,
v4.4.0, 5.x
(depending on
the model)
Yes
a. For each data channel (in this case, there are 4) there are 5 credits, plus 6 extra credits.
b. The dynamic long-distance mode (LD) automatically configures the number of buffer credits required, based on the actual link distance.
Table 11-2 Extended ISL Modes: Switches with Goldeneye ASIC
Mode Buffer Allocation Distance
@ 1 Gbit/
sec
Distance
@ 2 Gbit/
sec
Distance
@ 4 Gbit/
sec
Earliest
Fabric OS
Release
Extended
Fabrics
License
Required?
1 Gbit/
sec
2 Gbit/
sec
4 Gbit/
sec
L0 5 (26)
a
5 (26) 2.5 km 10 km 5 km 2 km All No
LE 11 16 10 km n/a 10 km 5 km v3.x, v4.x No
a. For each data channel (in this case, there are 4) there are 5 credits, plus 6 extra credits