Cat6500 Qos on Ethernet Subinterfaces - Metro Ethernet

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Dec 10th, 2007
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I am using a Cat6504E (w/Sup32) and WS-X6408A as a hub router for Metro Ethernet. I will configure the GigE ports facing MetroE as Layer 3 ports with subinterfaces, each subinterface having a distinct IP subnet with /30 address.


On each of these subinterfaces I would like to create a priority (low-latency) queue for my voice and video traffic. I will configure other QoS classes for other traffic types.


How do I create such QoS policy? MQC does not work for these subinterfaces. Do I use PFC3-based queuing? Can you point me to some examples?


Here is a snippet of what my MetroE connection looks like:


interface GigabitEthernet3/1

description Connection to Metro Ethernet Trunk #1

no ip address

mls qos trust dscp

!

interface GigabitEthernet3/1.1

description NATIVE VLAN - NOT USED

!

interface GigabitEthernet3/1.2

description Location 1

bandwidth 10000

encapsulation dot1Q 2

ip address 10.204.100.1 255.255.255.252

ip pim sparse-mode

!

interface GigabitEthernet3/1.3

description Location 2

bandwidth 10000

encapsulation dot1Q 3

ip address 10.204.100.5 255.255.255.252

ip pim sparse-mode

!

interface GigabitEthernet3/1.4

description Location 3

bandwidth 10000

encapsulation dot1Q 4

ip address 10.204.100.9 255.255.255.252

ip pim sparse-mode

!

interface GigabitEthernet3/1.5

description Location 4

bandwidth 10000

encapsulation dot1Q 5

ip address 10.204.100.13 255.255.255.252

ip pim sparse-mode

!

(etc)


Thanks in advance for your help.


Ron Buchalski


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umedryk Mon, 12/17/2007 - 14:42
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Before you place video traffic on a network, ensure that adequate bandwidth exists for all necessary applications. First, calculate the minimum bandwidth requirements for each major application, for example, voice, video, and data. The sum represents the minimum bandwidth requirement for any specific link. This amount should consume no more than 75 percent of the total bandwidth available on that link. This 75 percent rule assumes that some bandwidth is necessary for overhead traffic. Examples of overhead traffic include routing protocol updates and Layer 2 keepalives, as well as additional applications, such as e-mail and HTTP traffic. Have voice and video traffic occupy no more than 33 percent of link capacity. This Example Scenario int the below link explains capacity planning on a converged network


http://www.cisco.com/en/US/tech/tk543/tk757/technologies_tech_note09186a0080094968.shtml#cap_plan

ronbuchalski Wed, 12/19/2007 - 07:05
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Thank you for your response. I am familiar with the configuration guidelines for allocating QoS to voice and video. My question deals with the specifics (command line information) for configurations to allocate such a priority queue on a Gigabit ethernet interface of the Cat6504 switch when configured with multiple subinterfaces, each with an IP subnet.


Can anyone point me to such a reference, or provide more specific information?


Thank you,


Ron Buchalski


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