HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 143
Configuration prerequisites, Configuring QoS priority settings for voice traffic on an interface
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large quantities of forged voice VLAN-tagged or untagged packets to consume the voice VLAN bandwidth, affecting normal voice communication. • Security mode-Only voice packets whose source MAC addresses match the recognizable OUI addresses can pass through the voice VLAN-enabled inbound port, but all other packets are dropped. In a safe network, you can configure the voice VLANs to operate in normal mode, reducing the consumption of system resources due to source MAC addresses checking. TIP: HP does not recommend transmitting both voice traffic and non-voice traffic in a voice VLAN. If you must transmit both voice traffic and nonvoice traffic, make sure that the voice VLAN security mode is disabled. Table 17 How a voice VLAN-enabled port processes packets in security and normal mode Voice VLAN mode Security mode Normal mode Packet type Packet processing mode Untagged packets Packets that carry the voice VLAN tag If the source MAC address of a packet matches an OUI address configured for the device, it is forwarded in the voice VLAN; otherwise, it is dropped. Packets that carry other tags Forwarded or dropped depending on whether the port allows packets of these VLANs to pass through Untagged packets Packets that carry the voice VLAN tag The port does not determine the source MAC addresses of inbound packets. In this way, both voice traffic and non-voice traffic can be transmitted in the voice VLAN. Packets that carry other tags Forwarded or dropped depending on whether the port allows packets of these VLANs to pass through Configuration prerequisites Before you configure a voice VLAN, complete the following tasks: • Create a VLAN. • Configure QoS priority settings for voice VLAN traffic on an interface before you enable voice VLAN on the interface. If the configuration order is reversed, your priority configuration will fail. For more information, see "Configuring QoS priority settings for voice traffic on an interface." • Configure the voice VLAN assignment mode. For more information, see "Configuring a port to operate in automatic voice VLAN assignment mode" and "Configuring a port to operate in manual voice VLAN assignment mode." Configuring QoS priority settings for voice traffic on an interface In voice VLAN applications, you can improve the quality of voice traffic by configuring the appropriate QoS priority settings, including the Class of Service (CoS) and Differentiated Services Code Point (DSCP) 134