Brocade Communications Systems 4900 Service Manual Page 189

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Web Tools Administrator’s Guide 167
Publication Number: 53-1000435-01
Chapter
13
Administering Extended Fabrics
In this chapter
This chapter contains the following information:
About extended link buffer allocation,” next
“Configuring a port for long distance” on page 169
About extended link buffer allocation
As the distance between switches and the link speed increases, additional buffer-to-buffer credits
are required to maintain maximum performance. The number of credits reserved for a port
depends on the switch model and on the extended ISL mode for which it is configured.
NOTE
Because buffer credits are a switch resource, you must own the switch in order to modify Extended
Fabric settings on a port.
The Extended Fabric tab of the Switch Administration window displays information about the port
speed, long-distance setting, and buffer credits, as shown in Figure 75 on page 168. Use this tab to
configure the long-distance setting of a port. For detailed information on managing extended
fabrics, see the Fabric OS Administrator’s Guide.
NOTE
You do not need to use the Extended Fabrics feature unless the link is used over long distances.
The Extended Fabric tab displays the following information:
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 L0 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 Gbit/sec
- 2G—2 Gbit/sec
- 4G—4 Gbit/sec
- N1—Negotiated 1 Gbit/sec
- N2—Negotiated 2 Gbit/sec
- N4—Negotiated 4 Gbit/sec
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