Posted on July 29, 2019 9:26 pm
 |  Asked by Lynn Lockhart
 |  240 views
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I have been assigned the task of finding out what configuration is needed for an Arista 7160 switch. Below is the configuration I have come up with so far. If someone can tell me I’m on the right path or if I am totally wrong, I would appreciate it.

dcbx application udp 4791 priority 3
dcbx ets qos map cos 3 traffic-class 3
dcbx ets traffic-class 3 bandwidth 50
!
qos profile RDMA
qos trust cos
qos cos 3
priority-flow-control mode on
priority-flow-control priority 3 no-drop
!
tx-queue 1
bandwidth percent 50
!
tx-queue 3
bandwidth percent 50
!
interface Ethernet1
description TK5-3WP14R1701
mtu 9214
logging event link-status
dcbx mode ieee
switchport trunk allowed vlan 8-9,116-119,1001-1002,1111
switchport mode trunk
switchport
service-policy type qos input RDMA
qos trust cos
priority-flow-control mode on
priority-flow-control priority 3 no-drop
!
tx-queue 1
bandwidth percent 50
random-detect ecn minimum-threshold 10 segments maximum-threshold 50 segments
!
tx-queue 3
bandwidth percent 50
random-detect ecn minimum-threshold 50 segments maximum-threshold 100 segments
!
no qos rewrite cos
qos map dscp 3 to traffic-class 3
qos map traffic-class 3 to dscp 46
qos map traffic-class 0 2 4 5 6 7 to tx-queue 1
!
policy-map type qos RDMA
class class-default

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Posted by Vijay Kumar
Answered on August 7, 2019 11:10 am

Hi Lynn,

Based on the configuration I have made the following assumptions:

– You are trying to provide 50% BW of the port to RoCE traffic.
– RDMA traffic is mapped to the TC3 which is defined to be a No-loss queue.

The basic configuration-components for the above mention requirements are already present in your configuration. But I can see you have configured QOS features along with DCBX/PFC configuration.
Since it would need a better understanding of your requirements to provide an accurate answer to your query, I would recommend getting in touch with TAC by emailing support@arista.com.
Regards,
Vijay

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