Extended Isl Modes: B-Series 2Gb Switches (Bloom And Bloom Ii Asics) - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

vc_translation_link_in
it
desired_distance
5. Repeat step 4 for the remote extended ISL port. Both the local and remote extended ISL ports must be
configured to the same distance level. When the connection is initiated, the fabric will reconfigure.
The following example configures slot 1, port 1 for the LD link distance mode, enables the extended link
initialization sequence, and sets the desired distance to 50 kilometers:
switch:admin> portcfglongdistance 1/1 LD 1 50
Table 78 lists the extended ISL modes for switches with Bloom-based ASICs. You can configure extended
ISL modes with the portCfgLongDistance command when the Extended Fabrics license is activated.
Table 78

Extended ISL modes: B-Series 2Gb Switches (Bloom and Bloom II ASICs)

Mode Buffer allocation
1 Gbps 2 Gbps
1
L0 5 (26) 5 (26)
LE 13 19
2
LD Auto Auto
3
LS Based on Based on
user-spec user-spec
ified ified
distance distance
1. For each data channel (in this case, there are 4) there are 5 credits, plus 6 extra credits.
2. The dynamic long-distance mode (LD) automatically configures the number of buffer credits required,
based on the actual link distance.
3. The static long-distance mode (LS) allocates the number of buffer credits based on the user-specified
distance.
Enables the long-distance link initialization sequence. This
extended link initialization sequence is an enhanced link reset
protocol, and avoids excessive resetting of ports.
By default this option is set to 1 (enabled).
It must be set to 1 (enabled) when configuring a trunk over
Extended Fabrics. It must be set to 1 for a long-distance link not
configured for ISL R_RDY mode; otherwise, it must be reset to 0.
For an LD-mode link, desired_distance is a threshold limit for link
distance to ensure buffer availability for other ports in the same
port group. If the measured distance exceeds desired_distance,
then desired_distance is used.
For an LS-mode link, desired_distance is used to calculate the
buffers required for the port.
Distance @ 1 Distance @ 2
Gbps Gbps
10 km 5 km
n/a 10 km
Auto Auto
Maximum is 200 km Maximum is 100
km
Based on Based on
user-specified user-specified
distance distance
Maximum is 200 km Maximum is 100
km
Earliest Extended
Fabric OS Fabrics
release license
required?
All No
3.x, 4.x No
3.1.0, 4.1.0, Yes
4.4.0, 5.x
(depending on
the model)
5.1.0 Yes
Fabric OS 6.1.x administrator guide 355