Symptom
When the VSM is configured with NTP server, the NTP packets it sends to the server are tagged with the following invalid DSCP value:
Differentiated Services Field: 0x10 (DSCP 0x04: Unknown DSCP; ECN: 0x00)
0001 00.. = Differentiated Services Codepoint: Unknown (0x04)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Interpreting 0x04 as IP TOS would yield the following, which is an odd combination as well:
precedence - routine, 000
delay - low, 1
throughput - normal, 0
reliability - normal, 0
Section 5.2 of RFC4594 recommended NTP to have either EF or default marking depending on usage.
Conditions
DSCP marking of NTP packets from VSM.
Workaround
N/A
Further Problem Description:
