HP 8/8 Fabric OS Administrator's Guide v6.4.0 (53-1001763-01, June 2010) - Page 112

4 Inter-chassis links The following ICL connections are not allowed: • ICL0 ICL0 • ICL1 ICL1 Refer to the Brocade DCX Data Center Backbone Hardware Reference Manual for detailed ICL connection information. ICL ports can be used only with an ICL license. For more information on how license enforcement occurs, see Chapter 16, "Administering Licensing". After the addition or removal of a license, the license enforcement is performed on the ICL ports only when you issue the portDisable or portEnable commands on the switch for the ports. All ICL ports must be disabled, and then re-enabled for the license to take effect. An ICL license must be installed on both platforms forming the ICL connection. There are two LEDs - a status LED and an attention LED - for each ICL connector port. The following table describes the behavior of the LEDs. TABLE 8 LED behavior LED Color Description Action Status Black No connection with peer blade. NA Attention Green Black ICL connection with peer blade is NA good. ICL is fully operational. NA Blinking Yellow One or more links in the ICL connection is NOT operational. Reconnect the ICL cables or replace the ICL cables. The ICL ports appear as regular ports, with some restrictions. All port parameters associated with ICL ports are static and all portCfg commands are blocked from changing any of the ICL port parameters. The only management associated with ICL ports and cables is monitoring the status of the LEDs on the ICL ports and any maintenance if the ATTENTION LED is blinking yellow. For additional information about the LED status for blades and ports, see the Brocade DCX Hardware Installation manual. When you connect two Brocade Backbones, the following features are supported: • 8 Gbps speed • Trunking • Buffer-to-buffer credit sharing • QoS Supported topologies The triangular topology is supported between three Brocade DCX or DCX-4S chassis. On an ICL break the chassis that has the connections of the other two, is the main chassis. Any error messages relating to a break in the topology will appear in this chassis' RASlog. 72 Fabric OS Administrator's Guide 53-1001763-01