https://community.extremenetworks.com/t5/faqs/how-to-test-a-quality-of-service-configuration/m-p/45741#M345 Article ID: 5407 <BR /> <BR /> <B>Protocols/Features</B><BR /> QoS<BR /> CoS<BR /> ToS<BR /> <BR /> <B>Standards</B><BR /> 802.1p<BR /> 802.1d<BR /> <BR /> <B>Goals</B><BR /> Test a Quality of Service configuration<BR /> Verify the packet count in each priority transmit queue<BR /> <BR /> <B>Symptoms</B><BR /> Priority<BR /> <BR /> <B>Solution</B><BR /> Generally speaking, it is not possible to directly verify the count of packets that enter into, drop from, or are transmitted from each of the hardware transmit queues of an Enterasys device.<BR /> <BR /> That being said, here are some possibly helpful test procedures: <UL> <LI>To determine whether configured ToS/Priority/VLAN reassignments are functioning, inject a known mix of ingress traffic and then analyze (with a "Sniffer") the mix of egress traffic. The transmitted ToS value will be apparent on IP frames, and the transmitted 802.1p Priority and 802.1q VLAN will be apparent if 802.1Q Tagging is enabled on egress (<A href="http://bit.ly/1rOVKny" target="_blank" rel="nofollow noreferrer noopener">5811</A>). </LI><LI>To gain insights regarding transmit queue (<A href="http://bit.ly/1fVaacc" target="_blank" rel="nofollow noreferrer noopener">7584</A>) behavior, perform a similar test after (a.) ensuring that any given priority is mapped to a unique transmit queue and (b.) ensuring that the injected traffic is of sufficient volume to over-subscribe the available transmit bandwidth (possibly reduced via Outbound Rate Limiting). Only lower-priority traffic should be dropped as necessary to conform with available bandwidth constraints, unless only higher-priority traffic remains to be dropped.</LI></UL> Fri, 02 May 2014 21:14:00 GMT FAQ_User 2014-05-02T21:14:00Z https://community.extremenetworks.com/t5/faqs/how-to-test-a-quality-of-service-configuration/m-p/45741#M345 Article ID: 5407 <BR /> <BR /> <B>Protocols/Features</B><BR /> QoS<BR /> CoS<BR /> ToS<BR /> <BR /> <B>Standards</B><BR /> 802.1p<BR /> 802.1d<BR /> <BR /> <B>Goals</B><BR /> Test a Quality of Service configuration<BR /> Verify the packet count in each priority transmit queue<BR /> <BR /> <B>Symptoms</B><BR /> Priority<BR /> <BR /> <B>Solution</B><BR /> Generally speaking, it is not possible to directly verify the count of packets that enter into, drop from, or are transmitted from each of the hardware transmit queues of an Enterasys device.<BR /> <BR /> That being said, here are some possibly helpful test procedures: <UL> <LI>To determine whether configured ToS/Priority/VLAN reassignments are functioning, inject a known mix of ingress traffic and then analyze (with a "Sniffer") the mix of egress traffic. The transmitted ToS value will be apparent on IP frames, and the transmitted 802.1p Priority and 802.1q VLAN will be apparent if 802.1Q Tagging is enabled on egress (<A href="http://bit.ly/1rOVKny" target="_blank" rel="nofollow noreferrer noopener">5811</A>). </LI><LI>To gain insights regarding transmit queue (<A href="http://bit.ly/1fVaacc" target="_blank" rel="nofollow noreferrer noopener">7584</A>) behavior, perform a similar test after (a.) ensuring that any given priority is mapped to a unique transmit queue and (b.) ensuring that the injected traffic is of sufficient volume to over-subscribe the available transmit bandwidth (possibly reduced via Outbound Rate Limiting). Only lower-priority traffic should be dropped as necessary to conform with available bandwidth constraints, unless only higher-priority traffic remains to be dropped.</LI></UL> Fri, 02 May 2014 21:14:00 GMT https://community.extremenetworks.com/t5/faqs/how-to-test-a-quality-of-service-configuration/m-p/45741#M345 FAQ_User 2014-05-02T21:14:00Z