Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 534
Types of trunking, Masterless trunking, Inter-chassis Links
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22 Trunking overview Types of trunking Trunking can be between two switches, between a switch and an Access Gateway module, or between a switch and a Brocade adapter. The types of trunking are as follows: • ISL trunking, or E_Port trunking, is configured on an inter-switch link (ISL) between two Fabric OS switches and is applicable only to E_Ports. • ICL trunking is configured on an inter-chassis link (ICL) between two Backbones and is applicable only to ports on the core blades. Refer to Chapter 19, "Inter-chassis Links" for detailed information about ICL trunking. • EX_Port trunking is configured on an inter-fabric link (IFL) between an FC router (EX_Port) and an edge fabric (E_Port). The trunk ports are EX_Ports connected to E_Ports. See "EX_Port frame trunking configuration" on page 589 for additional information about EX_Port trunking. • F_Port trunking is configured on a link between a switch and either an Access Gateway module or a Brocade adapter. The trunk ports are F_Ports (on the switch) connected to N_Ports (on the Access Gateway or adapter). • N_Port Trunking is configured on a link between a switch and either an Access Gateway module or a Brocade adapter. It is the same as F_Port trunking. The trunk ports are N_Ports (on the Access Gateway or adapter) connected to F_Ports (on the switch). For more information, see "Configuring F_Port trunking for a Brocade adapter" on page 545, the Access Gateway Administrator's Guide, and the Brocade Adapters Administrators Guide. NOTE This chapter uses the term F_Port trunking to refer to a trunk between the F_Ports on a switch and the N_Ports on either an Access Gateway module or a Brocade adapter. This type of trunk might be referred to as N_Port trunking in the Access Gateway Administrator's Guide or Brocade Adapters Administrator's Guide. Masterless trunking Masterless trunking means that if the master port goes offline, one of the slave ports automatically becomes the new master port, thus avoiding traffic disruption. The new master port uses the old master port area and the old master port is assigned a new, unused area. In this way, the PID of the trunk does not change if the master port goes offline. If trunking is not masterless, and if the master port goes offline, traffic disruption can occur because the slave ports in the trunk group go offline to select the new master port and then come back online. Masterless trunking is supported for most platforms and trunking types: • All F_Port trunking is masterless. • ISL and ICL trunking are masterless. • EX_Port trunking is masterless, except on Backbones with VF disabled. 534 Fabric OS Administrator's Guide 53-1002745-02
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