HP Cisco MDS 9140 Cisco MDS 9000 Family Fabric Manager Configuration Guide - R - Page 506

Configuring Module Interface Shared Resources Chapter 22 Configuring Generation 2 and Generation 3 Switching Modules Send documentation comments to [email protected] Use the following guidelines to configure 4-port 10-Gbps switching modules when starting with the default configuration: 1. Configure the port mode. See the "About Interface Modes" section on page 20-3. 2. Configure the BB_credits, performance buffers, and extended BB_credits, as necessary. See the "BB_Credit Buffers for Switching Modules" section on page 22-13, "BB_Credit Buffers for Fabric Switches" section on page 22-22, and the "Extended BB_Credits" section on page 22-23. Configuring Port Speed The port speed on an interface, combined with the rate mode, determines the amount of shared resources available to the ports in the port group on a 48-port, 24-port 4-Gbps, or any 8-Gbps Fibre Channel switching module. Especially in the case of dedicated rate mode, the port group resources are reserved even though the bandwidth is not used. For example, on Generation 2 modules, if an interface is configured for autosensing (auto) and dedicated rate mode, then 4 Gbps of bandwidth is reserved even though the maximum operating speed is 2 Gbps. For the same interface, if autosensing with a maximum speed of 2 Gbps (auto max 2000) is configured, then only 2 Gbps of bandwidth is reserved and the unused 2 Gbps is shared with the other interface in the port group. Note • The Generation 2, 4-port 10-Gbps switching module supports 10-Gbps traffic only. • On Generation 3, 8-Gbps modules, setting the port speed to auto enables autosensing, which negotiates to a maximum speed of 8 Gbps. • On Generation 2, 4-Gbps modules, setting the port speed to auto enables autosensing, which negotiates to a maximum speed of 4 Gbps. Caution Changing port speed and rate mode disrupts traffic on the port. Traffic on other ports in the port group is not affected. To configure dedicated bandwidth on an interface using Fabric Manager, follow these steps: Step 1 Step 2 Step 3 Step 4 Select a switch from the Fabric pane, or select a group of switches (SAN, fabric, VSAN) from the Logical Domains pane. Expand Switches, expand Interfaces and select FC Physical from the Physical Attributes pane. You see the FC Physical > General tab in the Interfaces pane. Scroll until you see the row containing the switch and port you want to configure. Select auto, 1Gb, 4Gb, or autoMax2G from the Speed Admin column (see Figure 22-11). Note The Generation 3, 8-Gbps Fibre Channel swtiching modules support the following speed configurations: 1G, 2G, 4G, 8G, autoMax2G, autoMax4G and the auto speed configuration configures autosensing for the interface with 8 Gbps of bandwidth reserved. 22-32 Cisco MDS 9000 Family Fabric Manager Configuration Guide OL-17256-03, Cisco MDS NX-OS Release 4.x