NTP configuration on a 4503 with ios 12.1(19)EW

[EMBola]

Hello,

I'm trying to configure NTP on the 4503 with cisco ios 12.1(19)EW. Basically the NTP servers are external the 4503 is providing the inter-Vlan routing for the 5-2950's on the network. I also have an smtp gateway that's connected to the 4503, but it's not synchronizing it's clock.

The problem is that I need this smtp gateway to synchronize it's clock.

the conf on the 4503 is the following:
clock timezone EST -5
clock summer-time EDT recurring
clock calendar-valid
!
interface loopback 0
ip address 10.11.31.2 255.255.255.0
!
access-list 1 permit 10.11.31.91
access-list 2 permit A.B.65.70
access-list 2 permit A.B.65.69
!
ntp clock-period 17180016
ntp calendar-update
ntp master 2
ntp source loopback0
ntp access-group peer 2
ntp access-group serve 1
ntp server A.B.65.69 prefer
ntp server A.B.65.70

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Please indicate whether or not the conf on the 4503 is correct. I'm also concerned with the possibility that I might need NTP authentication for this to work. I'm also curious to know whether or not it's possible to have the 4503 sync with the SMTP gateway, since it's directly connected.

I appreciate the help.
Thank you,
Emanuel

 

[baddos]

What OS is the A.B.65.69 and A.B.6.70 running? I have noticed in the past, that Cisco doesn't like Microsoft NTP for some reason.