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[EX] How to retrieve interface names mapped to a specific VLAN using SNMP MIB

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Article ID: KB30759 KB Last Updated: 10 Mar 2016Version: 1.0
Summary:
This article shows how to retrieve interface names that are mapped to a specific VLAN using SNMP MIB.
Symptoms:
Using SNMP MIB, a user can obtain details of the number of interfaces along with the names that are mapped to a VLAN on EX series.
Solution:
Example: Use vlan20, and interfaces ge-0/0/39 and ge-0/0/46, which are mapped to that VLAN:

      root@WIRE>   show   vlans                         vlan20
      Name         Tag    Interfaces
      vlan20       20     ge-0/0/39.0*, ge-0/0/46.0*

  1. Use jnxExVlanName to get the index of the specific VLAN:

        root@WIRE> show snmp mib walk jnxExVlanName
        jnxExVlanName.2 = Test
        jnxExVlanName.4 = default
        jnxExVlanName.5 = vlan20     ----> 5 is the index for vlan20
        jnxExVlanName.10 = vt
        jnxExVlanName.11 = wireless
        jnxExVlanName.12 = vlan30

  2. Use jnxExVlanPortStatus to get the number and status of the interface mapped to the VLAN:

        root@WIRE> show snmp mib walk jnxExVlanPortStatus.5
        jnxExVlanPortStatus.5.552 = 3
        jnxExVlanPortStatus.5.559 = 3

  3.   Use dot1dBasePortIfIndex to obtain the ifindex value:

        root@WIRE> show snmp mib get dot1dBasePortIfIndex.552  
        dot1dBasePortIfIndex.552 = 589     ----> index for interface ge-0/0/39

  4. Use ifDescr to provide the interface name for that specific index:

          root@WIRE> show snmp mib get ifDescr.589
        ifDescr.589 = ge-0/0/39.0

Retrieve information of the other interface mapped to the VLAN:

     root@WIRE> show snmp mib get dot1dBasePortIfIndex.559
     dot1dBasePortIfIndex.559 = 596

     root@WIRE> show snmp mib get ifDescr.596
     ifDescr.596 = ge-0/0/46.0

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