Cisco Mds 9222I Multiservice Modular Switch Bb_Credit Buffers; Extended Bb_Credits; Combining Generation 1, Generation 2, And Generation 3 Modules - Cisco AP776A - Nexus Converged Network Switch 5020 Configuration Manual

Combining Generation 1, Generation 2, and Generation 3 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
1. ISL = E port or TE port.

Cisco MDS 9222i Multiservice Modular Switch BB_Credit Buffers

Table 15-17
Table 15-17
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 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
for how many extended BB_credits you can assign to a port (except for the maximum and minimum
limits). If necessary, you can take interfaces out of service to make more extended BB_credits available
to other ports.
Combining Generation 1, Generation 2, and Generation 3
Modules
Cisco MDS NX-OS Release 4.1(1) and later supports combining Generation 1, Generation 2, and
Generation 3 modules and switches with the following considerations:
•
Cisco MDS 9000 Family CLI Configuration Guide
15-22
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
MDS NX-OS Release 4.1(1) and later features are not supported on Generation 1 switches and
modules.
Chapter 15 Configuring Generation 2 and Generation 3 Switching Modules
BB_Credit
Buffers Per
Port Group
4509
15-8). When necessary, you can reduce the buffers on one port and
BB_Credit Buffers Per Port
Defaults
1
ISL Fx Port
250 16
OL-18084-01, Cisco MDS NX-OS Release 4.x
"Buffer