Cisco AP775A - Nexus Converged Network Switch 5010 User Manual

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22-23
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules
Buffer Credit Allocation
Cisco MDS 9124 Fabric Switch BB_Credit Buffers
Table 22-17 lists the BB_credit buffer allocation for 24-port 4-Gbps Fibre Channel switches.
Cisco MDS 9222i Multiservice Modular Switch BB_Credit Buffers
Table 22-18 lists the BB_credit buffer allocation for 18-port 4-Gbps Multiservice Modular switches.
Extended BB_Credits
Note Extended BB_credits are not supported on the Cisco MDS 9124 Fabric Switch, Cisco MDS 9134 Fabric
Switch, Cisco MDS 9222i Fabric Switch, the Cisco Fabric Switch for HP c-Class BladeSystem, and the
Cisco Fabric Switch for IBM BladeCenter.
To facilitate BB_credits for long haul links, the extended BB_credits feature allows the user to configure
the receive buffers above the maximum value on all Generation 2 switching modules (see the “Buffer
Credit Allocation” section on page 22-10). When necessary, you can reduce the buffers on one port and
assign them to another port, exceeding the default maximum. The minimum extended BB_credits per
port is 256 and the maximum is 4095.
In general, the user can configure any port in a port group to dedicated rate mode. To do this, you must
first release the buffers from the other ports before configuring larger extended BB_credits for a port.
Note The ENTERPRISE_PKG license is required to use extended BB_credits on Generation 2 switching
modules. Also, extended BB_credits are not supported by ports in shared rate mode.
All ports on the Generation 2 switching modules support extended BB_credits. There are no limitations
Table 22-17 24-Port 4-Gbps Switching Module BB_Credit Buffer Allocation Defaults
BB_Credit Buffer Allocation Type
BB_Credit
Buffers Per
Port Group
BB_Credit Buffers Per Port
Defaults
ISL
1
1. ISL = E port or TE port.
Fx Port
User-configurable BB_credit buffers 64 16 16
Table 22-18 18-Port 4-Gbps Switching Module BB_Credit Buffer Allocation Defaults
BB_Credit Buffer Allocation Type
BB_Credit
Buffers Per
Port Group
BB_Credit Buffers Per Port
Defaults
ISL
1
1. ISL = E port or TE port.
Fx Port
User-configurable BB_credit buffers 4509 250 16

Cisco AP775A - Nexus Converged Network Switch 5010 Specifications

General

Brand	Cisco
Model	AP775A - Nexus Converged Network Switch 5010
Category	Switch
Language	English