Fabric OS Administrator’s Guide
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53-1002745-02
Lossless Dynamic Load Sharing on ports
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ICL limitations
If ICL ports are connected during a core blade removal, it is equivalent to removing external E_Ports
which may cause I/O disruption on the ICL ports that have been removed.
If ICL ports are connected during a core blade insertion, it is equivalent to adding external E_Ports
which may cause I/O disruption due to reroutes. Lossless DLS, if enabled, takes effect to prevent
I/O disruption.
Traffic flow limitations
FA4-18
AP blades, which are supported on the Brocade DCX and DCX-4S devices, may continue to
experience frame drops after core blade removal or insertion. The path between an FA4-18 blade
and an FX8-24 blade, or vice versa, experiences I/O disruption because the FA4-18 blades do not
support this feature.
Configuring Lossless Dynamic Load Sharing
You configure Lossless DLS switch- or chassis-wide by using the dlsSet command to specify that no
frames are dropped while rebalancing or rerouting traffic.
Use the following procedure to configure Lossless Dynamic Load Sharing:
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the appropriate dlsSet command to enable or disable Lossless Dynamic Load Sharing.
switch:admin>
dlsset --enable -lossLess
switch:admin>
dlsset --disable -lossLess
Lossless Dynamic Load Sharing in Virtual Fabrics
Enabling Lossless Dynamic Load Sharing is optional on logical switches in Virtual Fabrics. If you
enable this feature, it must be on a per-logical switch basis and can affect other logical switches in
the fabric. XISL use must be disabled for Lossless DLS to be enabled.
How DLS affects other logical switches in the fabric
On a Brocade DCX platform, logical switch 1 consists of ports 0 through 5 in slot 1. Logical switch 2
consists of ports 6 through 10 in slot 1. The Lossless DLS feature is enabled on logical switch 1.
Because ports 0 through 10 in slot 1 belong to a logical switch where Lossless DLS is enabled, the
traffic in logical switch 2 is affected whenever traffic for logical switch 1 is rebalanced.
ATTENTION
Although Lossless DSL is enabled for a specific logical switch, you must have chassis-level
permissions to use this feature.
This effect on logical switch 2 is based on the configuration on logical switch 2:
•
If logical switch 2 has IOD enabled (iodSet only), IOD is enforced.
•
If logical switch 2 has Lossless DLS enabled, traffic is paused and resumed.
•
If logical switch 2 has no IOD (iodReset), traffic is paused and resumed.
Summary of Contents for Fabric OS 7.1.0
Page 1: ...53 1002745 02 25 March 2013 Fabric OS Administrator s Guide Supporting Fabric OS 7 1 0 ...
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Page 132: ...132 Fabric OS Administrator s Guide 53 1002745 02 Frame Redirection 4 ...
Page 194: ...194 Fabric OS Administrator s Guide 53 1002745 02 Ports and applications used by switches 6 ...
Page 254: ...254 Fabric OS Administrator s Guide 53 1002745 02 Brocade configuration form 8 ...
Page 274: ...274 Fabric OS Administrator s Guide 53 1002745 02 Validating a firmware download 9 ...
Page 302: ...302 Fabric OS Administrator s Guide 53 1002745 02 Creating a logical fabric using XISLs 10 ...
Page 344: ...344 Fabric OS Administrator s Guide 53 1002745 02 Concurrent zone transactions 11 ...
Page 374: ...374 Fabric OS Administrator s Guide 53 1002745 02 Setting up TI over FCR sample procedure 12 ...
Page 462: ...462 Fabric OS Administrator s Guide 53 1002745 02 ...
Page 490: ...490 Fabric OS Administrator s Guide 53 1002745 02 Ports on Demand 18 ...
Page 498: ...498 Fabric OS Administrator s Guide 53 1002745 02 Supported topologies for ICL connections 19 ...
Page 626: ...626 Fabric OS Administrator s Guide 53 1002745 02 Preparing a switch for FIPS B ...
Page 630: ...630 Fabric OS Administrator s Guide 53 1002745 02 Hexadecimal Conversion C ...
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