HP StorageWorks 2/24 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Env - Page 159
R_Port Domain_ID Assignment, Router Fabric Manager, R_Ports, Fabric Configuration, Insistent Domain_ID
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Implementing SAN Internetworking Solutions 4 R_Port Domain_ID Assignment The default preferred Domain_ID for each SAN router R_Port is 1. However, each port should be assigned a preferred Domain_ID (set at the R_Ports tab of the Fabric Configuration dialog box) that is unique within the attached fabric. The principal switch in the attached fabric then attempts to allocate this requested (preferred) Domain_ID to the R_Port. If the requested value is in use, the principal switch assigns the first available Domain_ID. NOTE: If more than one R_Port (from the same router or multiple routers) is attached to a fabric, each port requires a unique Domain_ID. The Insistent Domain_ID option (enabled at the R_Ports tab of the Fabric Configuration dialog box) ensures an R_Port gets a predictable (assigned) address. However, if the Insistent Domain_ID check box is enabled for an R_Port and the port does not get the preferred address, the R_Port segments and does not connect to the fabric. In addition, R_Ports segment if: • Two R_Ports physically connect to a single fabric and the connections are configured (at the SANvergence Manager application) for attachment to a pair of fabrics. • Two R_Ports physically connect to two fabrics and the connections are configured (at the SANvergence Manager application) for attachment to a single fabric. It is recommended that insistent (unique) Domain_IDs be assigned to directors, fabric switches, and R_Ports in routed fabrics. Assigning Domain_IDs results in known network addresses, predictable device behavior, and ease of locating and identifying equipment. Router Fabric Manager A fabric-attached R_Port acts as a router fabric manager that manages fabric discovery, device registration, zoning, and other fabric-related activities between the router and attached fabric. The router fabric manager provides communication between the fabric's simple name server (SNS) and the router's metropolitan simple name server (mSNS) or Internet simple name server (iSNS). When a SAN router connects to a Fibre Channel fabric, device information is mutually exchanged. The router and the fabric's principal switch register any new device information with their respective name servers. Implementing SAN Internetworking Solutions 4-15