The following example shows viewing VLAN ports using SNMP with no ports assigned.
> snmpget -v2c -c mycommunity 10.11.131.185 .
1.3.6.1.2.1.17.7.1.4.3.1.2.1107787786
SNMPv2-SMI::mib-2.17.7.1.4.3.1.2.1107787786 = Hex-STRING:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
The table that the Dell Networking system sends in response to the snmpget request is a table that
contains hexadecimal (hex) pairs, each pair representing a group of eight ports.
• Seven hex pairs represent a stack unit. Seven pairs accommodate the greatest number of ports
available — 64 ports on the device. The last stack unit begins on the 66th bit.
The first hex pair, 00 in the previous example, represents ports 1 to 7 in Stack Unit 0. The next pair to the
right represents ports 8 to 15. To resolve the hex pair into a representation of the individual ports, convert
the hex pair to binary. Consider the first hex pair 00, which resolves to 0000 0000 in binary:
• Each position in the 8-character string is for one port, starting with Port 1 at the left end of the string,
and ending with Port 8 at the right end. A 0 indicates that the port is not a member of the VLAN; a 1
indicates VLAN membership.
All hex pairs are 00, indicating that no ports are assigned to VLAN 10. In the following example, Port 0/2 is
added to VLAN 10 as untagged; the first hex pair changes from 00 to 04.
The following example shows viewing VLAN ports using SNMP with ports assigned.
[Dell Networking OS system output]
R5(conf)#do show vlan id 10
Codes: * - Default VLAN, G - GVRP VLANs
Q: U - Untagged, T - Tagged
x - Dot1x untagged, X - Dot1x tagged
G - GVRP tagged, M - Vlan-stack
NUM Status Description Q Ports
10 Inactive U Te 0/2
[Unix system output]
> snmpget -v2c -c mycommunity 10.11.131.185 .
1.3.6.1.2.1.17.7.1.4.3.1.2.1107787786
SNMPv2-SMI::mib-2.17.7.1.4.3.1.2.1107787786 = Hex-STRING: 40 00 00 00 00 00 00
00 00 00 00
The value 40 is in the first set of 7 hex pairs, indicating that these ports are in Stack Unit 0. The hex value
40 is 0100 0000 in binary. As described, the left-most position in the string represents Port 1. The next
position from the left represents Port 2 and has a value of 1, indicating that Port 0/2 is in VLAN 10. The
remaining positions are 0, so those ports are not in the VLAN.
NOTE: The table contains none of the other information the command provides, such as port speed
or whether the ports are tagged or untagged.
946
Simple Network Management Protocol (SNMP)
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