HP A7533A - Brocade 4Gb SAN Switch Base Release Note page 26

Fabric OS 6.3 supports only up to four 1-Gb circuits per VE/FCIP tunnel for the 1-Gb interfaces.
A VE/FCIP tunnel created over 10-Gb interfaces will be limited to 10 circuits created using IPIFs
on the same 10-GbE port (and no more than 1 Gb per circuit).
As a recommended best practice, the VE tunnel should not be oversubscribed (for example, 8-Gb
FC traffic over 500 Mb/s tunnel). General guidelines are 2:1 subscription without compression
and 4:1 with compression.
Nondisruptive firmware activation on Fabric OS 6.3 will disrupt I/O traffic on FCIP links.
FCR (VEX) is not supported on the DC SAN Director Multiprotocol Extension Blade but is supported
on the 1606 Extension SAN Switch.
Differences between the 1606 Extension SAN Switch/DC SAN Director Multiprotocol Extension
Blade platforms and previous-generation 7500/FR4-18i platforms include:
On the 1606 Extension SAN Switch, the GigE port does not directly correlate to a VE_Port.
On the DC SAN Director Multiprotocol Extension Blade, GigE ports 0-9 or 10-GbE port 1
(xge1) correspond to VE_Ports 12-21, and 10-GbE port 0 (xge0) corresponds to VE_Ports 22-
31.
The CLI syntax for the 1606 Extension SAN Switch/DC SAN Director Multiprotocol Extension
Blade varies from the 7500/FR4-18i. See the Brocade Fabric OS Command Reference document
for Fabric OS 6.3 for details.
Both ends of a tunnel must be identically configured for the Compression, FastWrite, and Tape
Pipeline options. If a mismatch exists, the tunnel will not be established and the TCP virtual connec-
tions will be removed.
Under traffic isolation (TI) zone configurations with failover enabled, non-TI zone traffic will use
the dedicated path if no other E or VE paths through the fabric exist, or if the nondedicated paths
are not the shortest paths. (A higher bandwidth tunnel with multiple circuits will become the shortest
path compared to a single tunnel.)
A VE/VEX tunnel and E/EX FC port cannot connect to the same domain at the same time.
The recommended Keep Alive Timeout must be the same on the tunnel and circuits on the switches
on both sides of a link.
The 1606 Extension SAN Switch and DC SAN Director Multiprotocol Extension Blade cannot receive
a ping from an external device (for example, a Windows PC).
Latency measurements supported on FCIP tunnels (tested limit under Fabric OS 6.3.0):
1 GbE with 200 ms round-trip time and 1% loss
10 GbE with 50 ms round-trip time and 0.1% loss
The 1606 Extension SAN Switch supports optical and copper media types on GE0 and GE1 in-
terfaces. Copper media is the default on GE0/GE1 ports and does not support autosense functions.
Inserting a 4 Gb SFP in GE ports of an HP StorageWorks 1606 Extension SAN Switch or DC
SAN Director Multiprotocol Extension Blade, can occasionally return one of the following messages:
No_Light or Unknown for GE ports in switchshow output.
Remove and reinsert the optic cable to correct this indication.
Can't read serial data in sfpshow output.
Reissue the sfpshow command to resolve this issue.
FCoE/CEE (2408 FCoE Converged Network Switch and DC SAN Director
Switch 10/24 FCoE Blade)
The 2408 FCoE Converged Network Switch balances the FCoE bandwidth across all six port
groups (each port group contains four ports). To get optimum performance for FCoE traffic HP
recommends that the user distribute server CNA connections across these six port groups.
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