November 2006
Intermediate to advanced
584 pages
14h
English
book
SAN Multiprotocol Routing: An Introduction and Implementation
by Jon Tate, Steve Fodor, Jure Arzensek
Content preview from SAN Multiprotocol Routing: An Introduction and Implementation
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Chapter 7. Cisco family routing products 223
Figure 7-16 shows the 48-port 4 Gbps Switching Module.
Figure 7-16 48-port 4 Gbps Switching Module
Buffer credits
Buffer credits affect the number of input/outputs (I/Os) that can be sent before an
acknowledgement is received. In extended Fibre Channel networks, you need
more buffer credits to keep the “pipe” filled because the latency has increased.
Each target-optimized port supports 255 buffer credits, and host-optimized ports
support 12 buffer credits per port. On the 14+2 line card, up to 3500 buffer credits
can be assigned to a single port if you are willing to sacrifice buffers on other
por
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