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HA data link not available reported in 'get nsrp' output

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Article ID: KB9955 KB Last Updated: 12 Sep 2012Version: 4.0
Summary:
HA data link not available reported in 'get nsrp' output
Symptoms:

'HA data link not available' is reported on SSG140 when only one interface is dedicated as the HA interface or assigned to the HA zone:

nsrp link info:
control   channel: ethernet0/1 (ifnum: 5)  mac: 0014f69e57c5 state: up
ha data link not available
ha secondary path link not available

Solution:
This is by design. 
If only one 100-Mb interface is assigned to the HA zone, the HA link will only support control messages.
If only one Gig interface is assigned to the HA zone, the HA link will support both control and data messages.

Also note that Session Synchronization happens over the control channel:

Control Channel:    Sends all configuration, Run Time Objects (RTO), and heartbeat messages
Data Channel:         Sends packets in an Active/Active mode only that arrive at the wrong Juniper firewall to the master Juniper firewall
Secondary Path:     Sends heartbeats to confirm Master
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