Users Guide
Displaying the Ports in a VLAN using SNMP
Dell Networking OS identies VLAN interfaces using an interface index number that is displayed in the output of the show interface
vlan command.
Example of Identifying the VLAN Interface Index Number
Dell(conf)#do show interface vlan id 10
% Error: No such interface name.
R5(conf)#do show interface vlan 10
Vlan 10 is down, line protocol is down
Address is 00:01:e8:cc:cc:ce, Current address is 00:01:e8:cc:cc:ce
Interface index is 1107787786
Internet address is not set
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed auto
ARP type: ARPA, ARP Timeout 04:00:00
To display the ports in a VLAN, send an snmpget request for the object dot1qStaticEgressPorts using the interface index as the instance
number, as shown in the following example.
Example of Viewing the Ports in a VLAN in SNMP
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 on an Aggregator, 12 ports.
The last stack unit is assigned eight pairs, the eight pair is unused.
The rst 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 rst 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 rst hex pair changes from 00 to 04.
Example of Viewing VLAN Ports Using SNMP (Port Assigned)
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 TenGi 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
784
Simple Network Management Protocol (SNMP)