NetXMS Support Forum

Hello @all,

having here NetXMS V5.0.4 at Linux Debian 12 running. 

Today i installed a new switch (Netgear GS728TPv3 / Software Version 6.2.0.25). At switch UI i see/set my configured VLAN at the ports:

VLAN1 -  g1 - g18, g25 - g28
VLAN2  - g19 - g24


In NetXMS the VLANs for VLAN2 shows on Port g11-g16 !!! The switch is polled via SNMP 2C.

Is this a bug in NetXMS or sends the switch wrong data via snmp?

Having anyone else such an issue?


Greetings
Marco

Server reads VLAN names from 1.3.6.1.2.1.17.7.1.4.3.1.1, then ports from 1.3.6.1.2.1.17.7.1.4.2.1.5 and 1.3.6.1.2.1.17.7.1.4.2.1.4, optionally also 1.3.6.1.2.1.17.7.1.4.3.1.2. For all those 3 tables index is VLAN ID and value is byte string, where each bit represent port membership in VLAN. You can check what values are actually returned. Below is description from Q-BRIDGE-MIB:

Each octet within this value specifies a set of eight ports, with the first octet specifying ports 1 through 8, the second octet specifying ports 9 through 16, etc. Within each octet, the most significant bit represents the lowest numbered port, and the least significant bit represents the highest numbered port.  Thus, each port of the bridge is represented by a single bit within the value of this object.  If that bit has a value of '1' then that port is included in the set of ports; the port is not included if its bit has a value of '0'.

Also note that "port number" in this context is bridge port number (as obtained from 1.3.6.1.2.1.17.1.4.1.2), not interface index.

Best regards,
Victor