HP StorageWorks 64 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Envir - Page 234
RSCN service requests, Broadcast frames, Joining Zoned Fabrics, Factors to Consider, When Implementing
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Physical Planning Considerations 5 Joining Zoned Fabrics Factors to Consider When Implementing Zoning - The default zone is enabled or disabled separately from the active zone set. - If the default zone is enabled, then all devices not in a specified zone are included in the default zone and can communicate with each other. - If the default zone is disabled and there is no active zone set, then the zoning feature is completely disabled for the fabric and no devices can communicate with each other. - All devices are considered to be in the default zone if there is no active zone set. • RSCN service requests - registered state change notification (RSCN) service requests are transmitted to all N_Ports or NL_Ports attached to the director or switch when the zoning configuration is changed. • Broadcast frames - Class 3 broadcast frames are transmitted to all N_Ports attached to the director or switch, regardless of zone membership. Directors and fabric switches are linked through ISLs to form multiswitch fabrics. In a multiswitch fabric, the active zoning configuration applies to the entire fabric. Any change to the configuration applies to all directors and switches in the fabric. When fabrics attempt to join, participating fabric elements exchange active zone configurations and determine if their configurations are compatible. If the configurations are compatible, the fabrics join. The resulting configuration is a single zone set containing zone definitions from each fabric. If the configurations cannot merge, E_Ports that form the ISL for each fabric element become segmented. The ports cannot transmit data frames between attached switches (class 2 or 3 traffic) but can transmit control frames (class F traffic). Zoning configurations are compatible if there are no duplicate Domain_IDs, the active zone set name is the same for each fabric (or switch in the fabric), and zones with the same names in each fabric have identical members. Consider the following factors when planning to implement zoning for one or more directors or switches in the enterprise. In particular, consider the implications of zoning within a multiswitch fabric. 5-28 McDATA Products in a SAN Environment - Planning Manual