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HCS // MIGRATION FROM N1K TO VDS

dlozanolt
Level 1
Level 1

Hi,


For our architecture we need to migrate from vCenter 5.5 to 6.5, so we need to migrate from N1K to VDS, N1K is not an option. In N1K is marking L2 QoS COS according to the DSCP of the IP packets coming from the UC Apps to the virtual switches.

- In UC Apps are marking DSCP according to the type of traffi

- N1K config mark COS L2 according to DSCP.

But, which is the behavior of the UCS/FI? They are basically switches, Are the taking into account L2 COS?

We want to garantee that  DSCP value is transparent for UCS/FI and VDS.

Thanks for your help,

Regards,

David Lozano

1 Accepted Solution

Accepted Solutions

Kirk J
Cisco Employee
Cisco Employee

Greetings.

Please take a look at https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Network-Mgmt/3-2/b_UCSM_Network_Mgmt_Guide_3_2.pdf which covers a lot of UCSM related QOS/COS settings.

 

The UCSM allows you to define your QOS classes.

"A quality of service (QoS) policy assigns a system class to the outgoing traffic for a vNIC or vHBA. This
system class determines the quality of service for that traffic. For certain adapters, you can also specify
additional controls on the outgoing traffic, such as burst and rate.
You must include a QoS policy in a vNIC policy or vHBA policy and then include that policy in a service profile to configure the vNIC or vHBA"

 

If your case, it sounds like you are already marking different classes at the dVS/OS level, rather than have the service profile/vnic mark the traffic as it egresses the vnic.  For this, you will then want to configure a QOS policy that is assigned to the vnics, and is set to "Host control = FULL"

 

Host Control field:

Whether Cisco UCS controls the class of service (CoS). This can be one of the following:

• None—Cisco UCS uses the CoS value associated with the priority selected in the Priority drop-down list regardless of the CoS value assigned by the host.

• Full—If the packet has a valid CoS value assigned by the host, Cisco UCS uses that value. Otherwise, Cisco UCS uses the CoS value associated with the priority selected in the Priority drop-down list.

 

So, you'll allow your OS/virtual switch level do the actual marking, but you still need to define the QOS classes and policies so the UCSM can treat your traffic with the appropriate prioritization.

 

Thanks,

Kirk...

 

View solution in original post

2 Replies 2

Kirk J
Cisco Employee
Cisco Employee

Greetings.

Please take a look at https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Network-Mgmt/3-2/b_UCSM_Network_Mgmt_Guide_3_2.pdf which covers a lot of UCSM related QOS/COS settings.

 

The UCSM allows you to define your QOS classes.

"A quality of service (QoS) policy assigns a system class to the outgoing traffic for a vNIC or vHBA. This
system class determines the quality of service for that traffic. For certain adapters, you can also specify
additional controls on the outgoing traffic, such as burst and rate.
You must include a QoS policy in a vNIC policy or vHBA policy and then include that policy in a service profile to configure the vNIC or vHBA"

 

If your case, it sounds like you are already marking different classes at the dVS/OS level, rather than have the service profile/vnic mark the traffic as it egresses the vnic.  For this, you will then want to configure a QOS policy that is assigned to the vnics, and is set to "Host control = FULL"

 

Host Control field:

Whether Cisco UCS controls the class of service (CoS). This can be one of the following:

• None—Cisco UCS uses the CoS value associated with the priority selected in the Priority drop-down list regardless of the CoS value assigned by the host.

• Full—If the packet has a valid CoS value assigned by the host, Cisco UCS uses that value. Otherwise, Cisco UCS uses the CoS value associated with the priority selected in the Priority drop-down list.

 

So, you'll allow your OS/virtual switch level do the actual marking, but you still need to define the QOS classes and policies so the UCSM can treat your traffic with the appropriate prioritization.

 

Thanks,

Kirk...

 

Hi Kirk,
Thanks for your help!!! :)
Best Regards,
David Lozano

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