Network devices discovery

[Sunny45]

Team,

I have to run SNMP discovery for some network devices, for which I have requested to get community string as credentials and port 161 to be opened, and add ACL of MID server IP to those network devices. 

Now I have heard that sometimes network devices also have port 22 open, so do I need SSH credentials as well?

Also can you please let me know, in what kind of devices this can be possible scenario? (e.g. Load balancers, Firewalls etc.) 

Thanks.

[Vasantharajan N · Accepted solution]

SNMP based discovery will happen for Network device discovery. SNMP protocol uses UDP port 161.

But Network devices are running ssh (TCP port 22) to login and manage the device. No need to open TCP port 22 to discover it.

[Sunny45]

Thanks Vasanthrajan.

So you are saying that no need port 22 to be open. So even if the port 22 is open on the device, discovery will skip that and go to snmp next in queue (i.e. port 161). Right?

[Vasantharajan N]

For Network discovery, ServiceNow will use SNMP protocol even port TCP/22 is opened on Network device.