Cisco MDS NTP problem

MDS9216i# sh ntp peer-status
Total peers : 1
* - selected for sync, + - peer mode(active),
- - peer mode(passive), = - polled in client mode
remote local st poll reach delay
-----------------------------------------------------------
=10.193.136.42 0.0.0.0 16 64 0 0.00000
MDS9216i#

Why the local has 0.0.0.0 instead of my mgmt0 ip of 10.193.136.43?

I have...

ntp server 10.193.136.42 prefer

in my configuration. That's all.

Other switches ok, but not this.
.