Service Manual
Fabric OS 7.4.0a Release Notes v2.0 Page 37 of 53
FCIP (Brocade 7800 and FX8-24)
• Any firmware activation will disrupt I/O traffic on FCIP links.
• Latency measurements supported on FCIP Tunnels:1GbE & 10GbE - 200ms round trip time and 1% loss.
• After inserting a 4G SFP in GE ports of an FX8-24 blade or 7800 switch, sometimes “sfpshow” output
might display “Cannot read serial data!”. Removing and re-inserting the SFP should resolve this issue. It is
recommended that users perform sfpshow immediately after inserting the SFP and ensure SFP is seated
properly before connecting the cables.
• When running FOS v7.2.0 or later, if the new FCIP Circuit Group feature is configured on any FCIP Circuits,
a downgrade operation to pre-FOS v7.2.0 will be blocked until the feature is removed from the FCIP
configuration(s).
Extention (Brocade 7840)
• Brocade 7840 does not support FCIP connection to Brocade 7800 or FX8-24.
• FOS v7.4 does not support 10G speed on the 24 16G FC ports on Brocade 7840.
• FOS v7.4 does not support VEX port on Brocade 7840.
• Running offline diagnostic tests results in FCIP tunnels down. Reboot the switch after offline diagnostic
tests to recover the tunnels.
• Brocade 7840 supports Brocade 10 Gbps Tunable DWDM 80KM SFP+ optical transceiver. Following CLI
command can be used to configure the transceiver usage in Brocade 7840.
• portcfgge ge_num --set -channel <channel_num>
The channel number can have a value of 1 through 102. The detailed explanation of the values are
provided in the product data sheet at the following link:
http://www.brocade.com/downloads/documents/data_sheets/product_data_sheets/10gbe-tunable-
dwdm-80km-sfp-ds.pdf
• When Brocade Network Advisor (BNA) v12.3.2 is used to download firmware on Brocade 7840, BNA
reports success of firmware download prematurely when 7840 has not reached High Availability state.
Customers for 7840 using BNA to download firmware should wait for extra fifteen minutes after BNA
reports success to resume a work load.
• Firmware downgrade from FOS v7.4 to FOS v7.3.0c or earlier should be avoided. Otherwise, the Brocade
7840 may become faulty. (Downgrading to FOS v7.3.0b5 can be used as a workaround.)
• FOS v7.4 does not support HCL with IP Extension.
• Fast deflate compression is supported only with FC traffics only, not with IP Extension.
• IP fragmentation is not supported on the LAN side ports.
• When running IPSec, it is recommended that both sides of the extension tunnel are running the same FOS
version.
FCoE/DCB/CEE (FCOE10-24)
• When upgrading a DCX/DCX-4S with one or more FCOE10-24 blades from FOS v6.x to FOS v7.0.0 or later,
the user should carefully review Chapter 5 of the FOS v7.0.0 Converged Enhanced Ethernet
Administrator’s Guide.
• Ethernet L2 traffic with xSTP Hello timer set to less than or equal to 3 seconds may experience momentary
traffic disruption during HA failover.
• Hot plugging a CP with firmware level less than FOS v6.3.0 into a DCX or DCX-4S with an active FCOE10-24
blade will result in the new standby CP not coming up.
• When operating in Converged Mode, tagged traffic on the native VLAN of the switch interface is processed
normally. The host should be configured not to send VLAN tagged traffic on the switch’s native VLAN.