S5560X-30C-EI ntp

CentOS Stream release 8（ 10.40.2.123）
使用chrony做时间服务器

cat /etc/chrony.conf 

 # Use public servers from the ***.*** project. 

# Please consider joining the pool (http://www.***.***/join.html). 

# pool 2.centos.***.*** iburst 

server ***.*** iburst 

server cn.***.*** iburst 

 # Record the rate at which the system clock gains/losses time. 

driftfile /var/lib/chrony/drift 

 # Allow the system clock to be stepped in the first three updates 

# if its offset is larger than 1 second. makestep 1.0 3 # Enable kernel synchronization of the real-time clock (RTC). rtcsync # Enable hardware timestamping on all interfaces that support it. #hwtimestamp * # Increase the minimum number of selectable sources required to adjust # the system clock. #minsources 2 # Allow NTP client access from local network. 

#allow 192.168.0.0/16 

allow 10.170.7.0/24 

# Serve time even if not synchronized to a time source. 

#local stratum 10 

 # Specify file containing keys for NTP authentication. keyfile /etc/chrony.keys 

 # Get TAI-UTC offset and leap seconds from the system tz database. leapsectz right/UTC 

 # Specify directory for log files. logdir /var/log/chrony 

bindaddress 10.40.2.123 

port 123 

# Select which information is logged. 

#log measurements statistics tracking 

server ***.*** iburst 

server 10.40.2.123 iburst 

交换机配置

clock protocol ntp 

 ntp-service enable 

 ntp-service authentication enable 

 ntp-service source Vlan-interface990 

 ntp-service unicast-server 10.40.2.123 source Vlan-interface402

dis ntp st 

 Clock status: unsynchronized 

 Clock stratum: 16 

 Reference clock ID: none 

 Clock jitter: 0.000000 s 

 Stability: 0.000 pps 

 Clock precision: 2^-19 

 Root delay: 0.00000 ms 

 Root dispersion: 140.85388 ms 

 Reference time: 00000000.00000000 Thu, Feb 7 2036 14:28:16.000 

 System poll interval: 8 s

配置不成功