Set DSCP value for CPU outbound packets

In Arista EOS, the following protocol packets are able to set a DSCP value other than the default value 0:

• RADIUS, TACACS, SNMP, SSH, and sFlow (feature supported from 4.18.1F)
• NTP, DNS, Syslog, Traceroute, OSPF, and OSPF3 protocols (from 4.22.1F)

Notes:

• The setting must be done individually and under the protocol section
• hostname is not supported. 

For example, setting all locally originated CP packets to DSCP value nc1/cs6/110000/63:

logging qos dscp 48

!

dns qos dscp 48

!

ntp qos dscp 48

!

traceroute qos dscp 48

!

sflow qos dscp 48

！

snmp-server qos dscp 48

！

radius-server qos dscp 48

！

tacacs-server qos dscp 48

！

management ssh

   qos dscp 48

!

router ospf general

   qos dscp 48

Arista Eos 4.21: BGP DSCP Configuration

By default, the BGP packets' DSCP value is 0x0. Now customer wants to have it configurable. A global value is enough. New configuration/change doesn't tear down existing sessions. This feature is started from 4.21.*?

The configuration is quite simple:

router bgp 1
  bgp transport qos dscp 48