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194 | Simple Network Management Protocol (SNMP)
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Displaying the Ports in a VLAN Using SNMP
FTOS identifies VLAN interfaces using an interface index number that is displayed in the output of the
command
show interface vlan, as shown in Figure 16-5.
Figure 16-5. Identifying the VLAN Interface Index Number
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 Figure 16-6.
Figure 16-6. Display the Ports in a VLAN in SNMP
The table that the Aggregator system sends in response to the snmpget request is a table that contains
hexadecimal (hex) pairs, each pair representing a group of eight ports.
• 7 hex pairs represents a stack unit. Seven pairs accommodates the greatest number of ports available
on an Aggregator, 56 ports. The last stack unit is assigned 8 pairs; the eighth pair is unused.
The first hex pair, 00 in Figure 16-6, represents ports 1-7 in Stack Unit 0. The next pair to the right
represents ports 8-15. 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.
FTOS(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
Last clearing of "show interface" counters 00:12:42
Queueing strategy: fifo
Time since last interface status change: 00:12:42
> 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
00 00 00 00 00 00 00 00 00