IBM 8478 Hardware Maintenance Manual - Page 90

Check your hub or switch documentation to see if they support 802.1p. (You can configure the switch to strip the tags from the packets and send it on to the next destination as normal traffic.) If these devices do not support 802.1p, or if you are not sure, use high priority queue (HPQ) to prioritize network traffic. The requirements for effectively using IEEE 802.1p tagging are: v The other devices receiving and routing 802.1p tagged packets must support 802.1p. v The adapters on these devices must support 802.1p. The Ethernet controller in your xSeries 200 and all IBM 10/100 Ethernet Security Adapters support 802.1p. v The adapter cannot be assigned to an adapter team. v If you are setting up virtual local area networks (VLANs) and packet tagging on the same adapter, 802.1p/802.1Q tagging must be enabled on the IBMSet Advanced tab. If your network infrastructure devices do not support IEEE 802.1p or you are not sure, you can still define filters and send packets as high priority. While HPQ does not provide the precise priority levels of 802.1p tagging, it does assign traffic as either high or low priority and sends high priority packets first. Therefore, if there are multiple applications on a system sending packets, the packets from the application with a filter are sent out first. HPQ does not change network routing, nor does it add any information to the packets. To assign HPQ, you can specify it using Priority Packet when you create or assign a filter. To effectively use HPQ, the adapter cannot be assigned to an adapter team. Virtual LAN Mode: A virtual LAN is a logical grouping of network devices put together as a LAN, regardless of their physical grouping or collision domains. Using VLANs increases network performance and improves network security. VLANs offer you the ability to group users and devices together into logical workgroups. This can simplify network administration when connecting clients to servers that are geographically dispersed across the building, campus, or enterprise network. Typically, VLANs are configured at the switch and any computer can be a member of one VLAN per installed network adapter. Your Ethernet controller supersedes this 80 Hardware Maintenance Manual: xSeries 200