IBM 87302RU Installation Guide - Page 94
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- User. Read-only access to all switch module settings. - User+. Read-only access to all switch settings, plus the ability to restart the switch module. TFTP Determine the location of the Trivial File Transfer Protocol (TFTP) servers (as well as the path and file name) to be used for the download configuration file, firmware code file, upload configuration file, and log file. v TFTP server software must be running for TFTP services to work. v For the configuration file that is uploaded to a TFTP server to be saved correctly, you must first save switch module configurations to non-volatile random access memory (NVRAM). v Before the switch can upload its history log file to the TFTP server, an empty history log file must exist on the TFTP server. Virtual LANs Virtual LANs (VLANs) allow multiple blade servers to be part of a logical group and prevent other servers that do not belong to a given group from gaining direct access to the group resources and data. The BladeCenter Ethernet switches can append a 4-byte VLAN tag to incoming frames on a per-port basis, and use the tag on certain frames to permit or block access to those frames at other ports. VLAN traffic can be restricted to a single BladeCenter T unit or can extend across multiple BladeCenter T units. When VLANs are extended across multiple BladeCenter T units, intermediate switches use the VLAN tag to block frames from nonmember destinations. When defining VLANs that span a chassis, consider the following points: v Blade server ports that are in the same VLAN must have the same VLAN ID. v Define the same VLAN ID on both Ethernet switches for blade servers that use both switches to connect to the same external network. v Ethernet switch ports used to span multiple BladeCenter T units must be configured as Tagged, with a specific default VLAN ID for any untagged packets. v The external ports and Link Aggregation Groups (LAGs) must be members of all VLANs that span multiple BladeCenter T units. v The intermediate network device that interconnects the BladeCenter T units must be configured to handle tagged VLAN packets for all applicable VLAN traffic that should be passed through the device. The BladeCenter T unit default VLAN ID is 1 and includes all blade servers in the chassis. If multiple VLANs are required, additional VLAN IDs must be configured. Review the following example to understand how VLANs can be configured. VLAN example The example shown in Figure 44 on page 81 defines three VLANs within a single BladeCenter T unit and multiple VLANs extended to multiple BladeCenter T units. Table 23 on page 81 shows the defined VLAN parameters that are set to support this configuration. Outgoing packets for internal blade server ports must be untagged. 80 BladeCenter T Types 8720 and 8730: Planning and Installation Guide