Release Notes

Fabric OS v7.3.0c Release Notes v1.0 Page 8 of 52
FOS v7.3 increase IPSec performance on Brocade 7840 with near line-rate throughput. FOS v7.3 implements
IPSec configuration through a policy applied to a FCIP tunnel. IPSec supports both IPv4 and IPv6 and jumbo
frames.
Adaptive Rate Limiting (ARL) Enhancements
FOS v7.3 implements two new ARL algorithms, Modified Multiplicative Decrease and Time-based Decrease, to
provide additional performance tailored to network conditions. In addition, ARL ramp up time has been
decreased from 10s to 1s comparing to Brocade 7800.
Increased Compression Performance
FOS v7.3 supports increased compression performance on FC data frames on Brocade 7840 before they are
sent through FCIP channels. End users can choose None, Aggressive Deflate, Deflate, and Fast Deflate
compression algorithm to choose from the highest compression ratio but lowest pre-compression throughput
at 10G to lowest compression ratio but highest pre-compression throughput at 40G.
Path MTU Discovery
FOS v7.3 supports path MTU discovery on Brocade 7840 to automatically discover IP MTU settings over the
WANs.
Stream Based Flow Control
FOS v7.3 supports stream based flow control on Brocade 7840 to isolate slow devices from affecting
performance of other devices for emulated devices sharing the same VE_Port.
Out of Order TCP Delivery
FOS v7.3 supports out of order TCP delivery on Brocade 7840 over WAN connections to minimize
retransmission of FC frames in a scenario of TCP packet loss.
WAN Test Tool
FOS v7.3 supports a WAN test tool on Brocade 7840 to generate test traffic over a pair of IP addresses to test
a WAN path for any network issue.
Monitoring and Alerting Policy Suite (MAPS) Enhancements
FOS v7.3 has a number of important MAPS feature enhancements. These include:
• Monitor Fabric Performance Impact
• Monitor new FCIP statistics on Brocade 7840
• Monitor fabric scalability limits
• Monitor ClearLink Diagnostic ports
• Monitor Ethernet management ports
• Monitor Flow Vision learning flows
• Support Port Decommissioning as an action
• Support dynamic groups
• Support port group augmentation
• Usability enhancements
Monitor Fabric Performance Impact
FOS v7.3 supports automatic monitoring and alerting of latency bottleneck conditions through pre-defined
thresholds and alerts in all pre-defined policies in MAPS. The advanced monitoring capabilities identify ports in