Buffer Pools
In the architecture of Generation 2, Generation 3, and Generation 4 modules, receive buffers shared by a set of ports are called buffer groups. The receive buffer groups are organized into global and local buffer pools.
The receive buffers allocated from the global buffer pool to be shared by a port group are called a global receive buffer pool. Global receive buffer pools include the following buffer groups:
- Reserved internal buffers
- Allocated BB_credit buffers for each Fibre Channel interface (user configured or assigned by default)
- Common unallocated buffer pool for BB_credits, if any, to be used for additional BB_credits as needed
- Performance buffers (only used on 12-port 4-Gbps and 4-port 10-Gbps switching modules)
Note The 48-port and 24-port 8-Gbps modules have dual global buffer pools. Each buffer pool in the 48-port modules support 24 ports and in the 24-port modules each buffer pool supports 12 ports.
Note The default BB_credit buffer allocation is the same for all port speeds.
Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.