Administrator Guide

• 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 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.
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
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.
Fetching Dynamic MAC Entries using
SNMP
The Aggregator supports the RFC 1493 dot1d table for the default VLAN and the dot1q table for all other
VLANs.
NOTE: The table contains none of the other information provided by the show vlan command, such as
port speed or whether the ports are tagged or untagged.
Simple Network Management Protocol (SNMP) 843