Cisco Mds 9124 Fabric Switch Bb_Credit Buffers; Cisco Mds 9222I Multiservice Modular Switch Bb_Credit Buffers; Extended Bb_Credits - HP Cisco MDS 9020 - Fabric Switch Configuration Manual

Chapter 14 Configuring Generation 2 Switches and Modules
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m

Cisco MDS 9124 Fabric Switch BB_Credit Buffers

Table 14-11
Table 14-11
BB_Credit Buffer Allocation Type
User configurable BB_credit buffers
1. ISL = E port or TE port.

Cisco MDS 9222i Multiservice Modular Switch BB_Credit Buffers

Table 14-12
Table 14-12
BB_Credit Buffer Allocation Type
User configurable BB_credit buffers
1. ISL = E port or TE port.

Extended BB_Credits

Extended BB_credits are not supported on the Cisco MDS 9124 Fabric Switch, Cisco MDS 9134 Fabric
Note
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
Credit Allocation" section on page
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 mode. To do this, you must first
release the buffers from the other ports before configuring larger extended BB_credits for a port.
The ENTERPRISE_PKG license is required to use extended BB_credits on Generation 2 switching
Note
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
OL-16184-01, Cisco MDS SAN-OS Release 3.x
lists the BB_credit buffer allocation for 24-port 4-Gbps Fibre Channel switches.
24-Port 4-Gbps Switching Module BB_Credit Buffer Allocation Defaults
lists the BB_credit buffer allocation for 18-port 4-Gbps Multiservice Modular switches.
18-Port 4-Gbps Switching Module BB_Credit Buffer Allocation Defaults
14-7). When necessary, you can reduce the buffers on one port and
BB_Credit
Buffers Per BB_Credit Buffers Per Port
Port Group Defaults
1
ISL
64 16
BB_Credit
Buffers Per BB_Credit Buffers Per Port
Port Group Defaults
1
ISL
4509 250
Cisco MDS 9000 Family CLI Configuration Guide
Buffer Credit Allocation
Fx Port
16
Fx Port
16
"Buffer
14-15