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NTP disable command not disabling NTP

watcher60
Beginner
Beginner

All,

  I have a pair of 3750 L3 switches which we use as our internet edge switches running the below code:

sho ver
Cisco IOS Software, C3750 Software (C3750-IPSERVICESK9-M), Version 15.0(2)SE7, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Thu 23-Oct-14 14:36 by prod_rel_team

ROM: Bootstrap program is C3750 boot loader
BOOTLDR: C3750 Boot Loader (C3750-HBOOT-M) Version 12.2(25r)SEE4, RELEASE SOFTWARE (fc1)

 

 

I wanted to disable NTP on the internet facing interfaces (which are vlan interfaces), however while the "ntp disable" command has taken I have found the switches are still responding on the interface to ntp requests.

 

below is an example interface config

 

interface Vlan5
 description VoIPINET
 ip address x.x.x.x 255.255.255.224
 no ip proxy-arp
 standby 5 ip x.x.x.x
 ntp disable
end

 

the configured NTP servers in the config are defined to use a different vlan interface (which leads to the internal network)

 

I know I could use an ACL instead to lock this down but is anyone aware why the ntp disable command is not being respected?

 

 

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