HP StorageWorks Fabric OS 5.X Administrator Guide (AA-RVHWB-TE, September 2005)

164 Administering extended fabrics
• Starting with Fabric OS 4.4.0, VC translation link initialization (an option of the
portCfgLongDistance command) is enabled by default for LD links. For previous Fabric OS
versions that support this option, it was disabled by default. To avoid inconsistency in the fabric, make
sure that this value is enabled on both ends of the link. To connect to switches running Fabric OS
versions earlier than 4.0.2 and 3.0.2c, make sure that VC translation link initialization is disabled
because these versions do not support it.
Choosing an extended ISL mode
Table 30 lists the extended ISL modes for switches that have a Bloom ASIC. You can configure extended
ISL odes with the portCfgLongDistance command when the Extended Fabrics license is activated.
Table 31 lists the extended ISL modes for switches that have a Goldeneye ASIC.
Table 32 lists the extended ISL modes for switches that have a Condor ASIC.
Table 30 Extended ISL modes: switches with Bloom ASIC
Mode Description Buffer Allocation Distance at
1 Gbps
Distance at
2 Gbps
Earliest
Fabric OS
release
Extended
Fabrics
License
Required?
1 Gbps 2 Gbps
L0 Level 0 static mode; the
default
5 (26)
2
5 (26) 10 km 5 km All No
LE Level E static mode; supports
links beyond 5 km
13 19 N/A 10 km 3.x, 4.x No
L0.5 Level 0.5 static mode
(designated LM when listed
with the portcfgshow
command)
19 34 25 km 25 km 3.1.0, 4.1.0,
4.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
1
Dynamic mode uses
automatic distance detection
for a user-specified distance
Auto Auto Auto Auto 3.1.0, 4.1.0,
4.4.0, 5.x
(depending on
the model)
Yes
1
The dynamic long-distance mode (LD) configures the number of buffer credits required, based on the actual link distance.
2
For each data channel (in this case there are 4) thare are 5 credits, plus 6 extra credits.
Table 31 Extended ISL modes: switches with Goldeneye ASIC
Mode Buffer Allocation Distance at
1 Gbps
Distance at
2 Gbps
Distance at
4 Gbps
Earliest Fabric
OS release
Extended fabrics
license required?
1 Gbps 2 Gbps 4 Gbps
L0 5 (26)
1
5 (26) 2.5 km 10 km 5 km 2 km All No
LE 11 16 10 km N/A 10 km 5 km 3.x, 4.x No
1
For each data channel (in this case, there are 4) there are 5 credits, plus 6 extra credits.