I Have a Linksys Managed Switch and a Cisco router
Using SNMP protocol I am trying determine the device is a router or switch and
Also which all layers are supported by the device?
Following methods are used .
Issue a get request for: "sysObjectId", "sysDescr", "sysServices", "ipForwarding".
Here is my problem I am surprised by the output of "sysServices"
For Cisco router sysServices = 78
For Cisco router ipForwarding = 1
For Linksys switch sysServices = 2
For Linksys switch ipForwarding = 2
For For windows workstation sysServices = 76
My Linksys Switch is a Layer 2 Device
Then value Should be 3 = 2^ (1-1) + 2 ^(2-1)
For Computing sysServices value blow stated Equation is used
Note: A value which indicates the set of services that this entity may potentially offer. The value is a sum. This sum initially takes the value zero. Then, for each layer, L, in the range 1 through 7, that this node performs transactions for, 2 raised to (L - 1) is added to the sum. For example, a node which performs only routing functions would have a value of 4 (2^(3-1)). In contrast, a node which is a host offering application services would have a value of 72 (2^(4-1) + 2^(7-1)). Note that in the context of the Internet suite of protocols, values should be calculated accordingly: layer functionality
1 physical (e.g., repeaters) 2 datalink/subnetwork (e.g., bridges) 3 internet (e.g., supports the IP) 4 end-to-end (e.g., supports the TCP) 7 applications (e.g., supports the SMTP) For systems including OSI protocols, layers 5 and 6 may also be counted.1.What are Possible values for sysServices ? How the sysServices value computed by the vendors?
Thanks in advance