Service Manual

Fabric OS 7.4.0a Release Notes v2.0 Page 35 of 53
• If FOS v7.2 or later is factory installed (or by firmwarecleaninstall), Adaptive Networking features are
always available. This matches the behavior of the Brocade 6520 and all products shipping with prior
versions of FOS and with the Adaptive Networking license factory installed.
o Ports will come up in AE mode by default
o If the remote port supports QOS and is not explicitly disabled, the link will come up in QOS mode.
Otherwise, the link will come up in normal mode.
Access Gateway
Users who want to utilize Access Gateway’s Device-based mapping feature in the ESX environments are
encouraged to refer to the SAN TechNote GA-TN-276-00 for best implementation practices. Please follow these
instructions to access this technote:
1. Log in to http://my.brocade.com
2. Go to Documentation > Tech Notes.
3. Look for the Tech Note on Access Gateway Device-Based Mapping in VMware ESX Server.
D_Port
• The 16Gb QSFP optics used in FC16-64 blade do not support electrical loopback and optical loopback
tests. Support is limited to:
o Link traffic tests across the 16Gb QSFPs
o Roundtrip link latency measurements
o Link distance measurements for links that are longer than 100 meter
• D_Port support with HBA/Adapter from Qlogic and Emulex begins with FOS v7.3.0a. FOS v7.3.1a or earlier
FOS versions require the Fabric Vision license to support D_Port with 3rd party vendor HBAs. FOS v7.4.0
adds the support for D_Port with 3rd party vendor HBAs with the combination of Fabric Watch license and
Advanced Performance Monitoring license. Please refer to Qlogic and Emulex documentation for specific
adapter models and firmware levels required.
Edge Hold Time
• Edge Hold Time (EHT) default settings for FOS v7.x have changed from those in some FOS v6.4.x
releases. The following table shows the Default EHT value based on different FOS release levels originally
installed at the factory:
Factory Installed Version of FOS Default EHT Value
FOS v7.X 220 ms
FOS v6.4.3x 500 ms
FOS v6.4.2x 500 ms
FOS v6.4.1x 220 ms
FOS v6.4.0x 500 ms
Any version prior to FOS v6.4.0 500 ms
Gen 5 platforms and blades are capable of setting an EHT value on an individual port basis. On 8G
platforms EHT is set on an ASIC-wide basis, meaning all ports on a common ASIC will have the same EHT
setting. Extra care should be given when configuring EHT on 8G platforms or Gen 5 platforms with 8G
blades to ensure E_Ports are configured with an appropriate Hold Time setting.
When using Virtual Fabrics and creating a new Logical Switch when running FOS v7.1.0 or later, the default
EHT setting for the new Logical Switch will be the FOS default value of 220ms. However, with FOS v7.1.0
and later, each Logical Switch can be configured with a unique EHT setting that is independent of other