Brocade Web Tools Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 187)

Administering Extended Fabrics
● Extended link buffer allocation overview....................................................................... 187
● Configuring a port for long distance.............................................................................. 189
Extended link buffer allocation overview
If the link is used over long distances, use the Extended Fabric tab of the Switch Administration
window to configure the long-distance setting of a port. Because buffer credits are a switch resource,
you must own the switch in order to modify extended fabric settings on a port. The EGM license must
be enabled on the switch; otherwise, access to configuring long distance is denied and an error
message displays.
The Extended Fabric tab displays information about the port speed, long-distance settings, and buffer
credits, as shown in the following figure. For detailed information on managing extended fabrics, refer to
the Fabric OS Administrator's Guide.
The Extended Fabric tab displays the following columns:
• Port Number
• Buffer Limited --Indicates whether the port is buffer limited. A buffer-limited port can come online
with fewer buffer credits allocated than its configuration specifies, allowing it to operate at a reduced
bandwidth instead of being disabled for lack of buffers.
Buffer-limited operation is supported for the LS and LD extended ISL modes only and is persistent
across reboots, switch disabling and enabling, and port disabling and enabling.
• Port Speed --The port speed is displayed as follows:
‐ 1G--1 Gbps
‐ 2G--2 Gbps
‐ 4G--4 Gbps
‐ 8G--8 Gbps
‐ 10G--10 Gbps
‐ N1--Negotiated 1 Gbps
‐ N2--Negotiated 2 Gbps
‐ N4--Negotiated 4 Gbps
‐ N8--Negotiated 8 Gbps
‐ N16--Negotiated 16 Gbps
‐ Auto-Negotiation
• Buffer Needed --The number of buffers needed. You can edit the buffer needed for LD and LS
modes. When you change Buffer Needed value, Frame Size and Desired Distance(km) value
cannot be changed.
• Buffer Allocated --The number of buffers actually allocated.
• Recommended Buffer-- The number of recommended buffers. The recommended buffer value is
non-editable. The default port configuration value displays when the Extended Fabric is launched for
the first time. When you change Frame Size and Desired Distance(km), the recommended buffer
value changes according to the current port configuration. When the number of buffers needed is
configured for a port, the recommended buffer value is set to N/A for the same port.
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