Can HSRP standby IP be NTP server?

lbhoang · ‎03-07-2007

I've got two 6513 switches that sync time with NTP master. Once synced they become NTP servers. I'd like to take advantage of this fact and use the HSRP standby IP on one of the L3 routable VLANs as NTP server:

SWITCH1#sh run int vlan 100

!

interface Vlan100

description Servers VLAN

ip address 10.138.0.2 255.255.254.0

no ip redirects

arp timeout 240

standby 1 ip 10.138.0.1

standby 1 priority 150

standby 1 preempt

end

SWITCH2#sh run int vlan 100

!

interface Vlan100

description Servers VLAN

ip address 10.138.0.3 255.255.254.0

no ip redirects

arp timeout 240

standby 1 ip 10.138.0.1

end

Hosts on other VLANs such as L2 VLANs behind FWSM can sync time with 10.138.0.1. The problem is hosts on the same VLAN 100 cannot sync time with 10.138.0.1 but can with 10.138.0.2 or 10.138.0.3. Anybody have any ideas? Thank you in advance.

Danilo Dy · ‎03-07-2007

Yes, for the same VLAN they can't use the Virtual IP as source for NTP. But for other VLAN, they can.

But I suggest you use a Loopback IP. Because if the physical interface went down, the NTP is down as well.