Discovery of Citrix Netscaler devices fails

Question

I have two older Citrix Netscaler devices that is discovered fine, but 4 new'er devices (Netscaler NS10.5) is not discovered.
We can see that SCOM connects to the devices but SCOM says "No Response SNMP". Using a MIB browser I can connect to the newer Netscalers  and do a SNMP GET to read data from the MIB, however if I use a SNMP GET NEXT, the request time out so
now I get no data.
If do the same with the older Netscaler devices i.e. a GET and then a GET NEXT then I get data in both cases.
This actually corresponds to the Netscaler documentation that says that GET NEXT is no longer support on the newer Netscalers.
This leads me to think that SCOM might uses a GET NEXT in the discovery process. I haven't used a sniffer yet to check this.
If anyone has had the same problem and knows a workaround I'd be very happy to hear about it :)
br
Lars

Answer 1

Hi Ivan,
thanks for your reply.
The problem I have is the discovery via the SCOM 2012 network device discovery rule, which has to work before the Netscaler MP will see the device.  As I understand your reply it was the Commtrade Netscaler MP that didn't see the NS 10.5 devices right?
But I have not even tested the Netscaler yet.
I'm don't have access the the NS 10.5 device so I can't see how it's configured but I have found this information on the Citrix web site
http://support.citrix.com/proddocs/topic/ns-system-10-5-map/ns-ag-config-ns-snmp-vo-vt-query-con.html. I think the problem is that the new NS 10.5
by default does not accept Get-Next request and that this has to be configured first by configuring a community string and associate this string with both Get AND Get-Next, before the device will accept the Get-Next request that the SCOM discovery
rule sends after the initial Get request. Am I on the right track ?
Configuring the NetScaler for SNMP v1 and v2 Queries
You can query the NetScaler SNMP agent for system-specific information from a remote device called SNMP managers. The agent then searches the management information base (MIB) for the data requested and sends the data to the SNMP manager.
The following types of SNMP v1 and v2 queries are supported by the SNMP agent:
GET
GET NEXT
ALL
GET BULK
You can create strings called <var class="keyword varname">community strings</var> and associate each of these to query types. You can associate one or more community strings to each query type. Community string
are passwords and used to authenticate SNMP queries from SNMP managers.
For example, if you associate two community strings, such as abc and
bcd, to the query type GET NEXT, the SNMP agent on the NetScaler appliance considers only those GET NEXT SNMP query packets that contain
abc or bcd as the community string.
thanks again
br
Lars