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Fabric OS v6.4.1 Release Notes v1.0 Page 32 of 62

• A switch running FOS v6.4 in InteropMode 0 (Brocade Native Mode) cannot connect to an EX_Port

on an AP7420. A switch running FOS v6.4 in InteropMode 2 or InteropMode 3 can be connected

to EX ports on an AP7420.

Extended Fabrics and R_RDY Flow Control

Beginning with Fabric OS v5.1, Brocade supported the Extended Fabrics feature in conjunction with

R_RDY flow control (R_RDY flow control mode can be enabled via portCfgISLMode command). R_RDY

flow control mode that uses IDLE primitives does not support Brocade frame-based Trunking for

devices such as Time Division Multiplexor (TDM.) In order to overcome this limitation and provide

support for frame-based Trunking with Extended Fabrics, Fabric OS v6.2.0 and later has been

enhanced to support interoperability with these distance extension devices.

Fabric OS v6.3.1 allows Extended Fabrics E_Ports to operate in VC_RDY mode using either ARB or

IDLE primitives as fill words. This allows frame-based Trunking to be supported on Extended Fabrics E-

ports even when IDLE primitives are configured for these ports when operating in native VC_RDY

mode. Prior to this change, frame-based Trunking was supported only when ARB primitives were used

in VC_RDY mode. With Fabric OS v6.2 or later, frame-based Trunking is supported on Extended

Fabrics E_Ports regardless of whether IDLE or ARB primitives are used when operating in native

VC_RDY mode.

Implementation

The portcfglongdistance CLI parameter “VC Translation Link Init” is now overloaded to specify if the

long distance link should use IDLE or ARB primitives. By default, vc_init is enabled. If vc_init is

enabled, the long distance link will use ARB primitives. If vc_init is disabled, the link will use IDLE

primitives.

Note:

Buffer to Buffer Credit Recovery feature is not supported on Extended Fabrics E_Port when it is

configured to use IDLE primitives. The user must disable buffer to buffer credit recovery feature using

the command portcfgcreditrecovery and specifying the disable option; otherwise, the link will

continuously reset.

The Adaptive Networking SID/DID Traffic Prioritization QoS feature is not supported on Extended

Fabrics E_Ports when IDLE primitives are configured on these ports. This is because in this mode only

data Virtual Channels are available while QoS related virtual channels are not available.

When connecting to an extension device that does not support ARB primitives (such as some TDM

products), the following configuration must be used:

portcfgqos -disable <port>

portcfgcreditrecovery –disable <port>

portCfgLongDistance <port> <LD|LD> 0 <distance>

The fabric parameter “fabric.ops.mode.longdistance” is now deprecated and should not be used.

Miscellaneous.

• When ports on a 5470 embedded switch are configured for 8G, Emulex HBAs may not

these HBAs to log in correctly at 8G.

• POST diagnostics for the Brocade 5100 have been modified beginning with FOS v6.3.1b

and v6.4.0 to eliminate an “INIT NOT DONE” error at the end of an ASIC diagnostic port

loopback test. This modification addresses BL-1020 Initialization errors encountered

during the POST portloopbacktest. (Defect 263200)

• It is recommended that no more the 50 F_Port Top Talkers be enabled on a 48000

director in a large fabric (>4000 devices).

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