Chapter 14 Administering Extended Fabrics; In This Chapter; Extended Link Buffer Allocation Overview - Brocade Communications Systems 8 Administrator's Manual

Administering Extended Fabrics

In this chapter

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
fabrics, refer to the Fabric OS Administrator's Guide.
The Extended Fabric tab displays the following information:
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Extended link buffer allocation overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
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Configuring a port for long distance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Figure 54
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:
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1G—1 Gbps
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2G—2 Gbps
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4G—4 Gbps
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8G—8 Gbps
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N1—Negotiated 1 Gbps
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N2—Negotiated 2 Gbps
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N4—Negotiated 4 Gbps
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Auto-Negotiation
Buffer Needed/Allocated—The number of buffers needed and the number of buffers that are
actually allocated.
Actual Distance (km)—The actual distance for the link in kilometers.
Desired Distance (km)—Required for a port configured in LD or LS mode
page 183), the desired distance, in kilometers, for the link.
on page 182. For detailed information on managing extended
Chapter
14
(Table 16 on
181