Connecting to devices, Connecting to other switches, Table 4 standard isl modes – HP Brocade 4Gb SAN Switch for HP BladeSystem p-Class User Manual
Page 31: Working with domain ids, 4 standard isl modes
Fabric OS 5.0.0 procedures user guide
31
Connecting to devices
To minimize port logins, power off all devices before connecting them to the switch. For devices that
cannot be powered off, first use the
portdisable
command to disable the port on the switch, and then
connect the device. When powering the devices back on, wait for each device to complete the fabric login
before powering on the next one.
Connecting to other switches
Refer to the hardware user’s guide of your specific switch for interswitch link (ISL) connection and cable
management information.
summarizes the standard ISL modes, which you can configure with the
portcfglongdistance
command. For information on extended ISL modes, which enable longer
distance interswitch links, see ”
Administering extended fabrics
Working with domain IDs
Although domain IDs are assigned dynamically when a switch is enabled, you can reset them manually
so that you can control the ID number or to resolve a domain ID conflict when you merge fabrics.
If a switch already has a domain ID when it is enabled, and that domain ID conflicts with a switch
already in the fabric, the conflict is automatically resolved. The process can take several seconds, during
which time traffic is delayed.
The default domain ID for HP StorageWorks switches is 1.
The default domain ID applies to both of the logical switches in Core Switch 2/64 and SAN Director
2/128 switches that are configured for two domains. To prevent domain conflict, you can either disable
one of the switches until both are connected to the fabric, then reenable the switches so that unique
domain IDs are automatically assigned; or use the procedure ”
” on page 32 to make
the domain IDs unique before connecting the logical switches to the fabric.
CAUTION:
On switches running Fabric OS v4.0.0 and later, do not use domain ID 0, which is reserved
for another purpose. Using this domain ID can cause the switch to reboot continuously. Avoid changing
the domain ID on the FCS in secure mode. To minimize down time, change the domain IDs on the other
switches in the secure fabric.
To display domain IDs:
1.
Connect to a switch and log in as admin.
Table 4
Standard ISL modes
Mode
Description
Maximum ISL distance (km)
Earliest fabric OS release
L0
1
1. When you upgrade from Fabric OS v4.0.0 to Fabric OS v4.1.0 or later, all extended ISL ports are set automatically to L0
mode.
Level 0 static mode, the
default.
•
10 km at 1 Gbps
•
5 km at 2 Gbps
•
2.5 km at 4 Gbps
All
LE
Level E static mode,
supports links beyond 5
km.
10 km at 1, 2, or 4 Gbps
v3.0.0, v4.0.0