Description

This article provides an example list of commands to retrieve the MAC address with interface name for a specific VLAN using SNMP MIB in ELS.

Solution

Use the following list of commands:

Get the VLAN name: 

root@qfxsw2# run show ethernet-switching table
 MAC flags (S - static MAC, D - dynamic MAC, L - locally learned, P - Persistent static, C - Control MAC
           SE - statistics enabled, NM - non configured MAC, R - remote PE MAC, O - ovsdb MAC)
 
Ethernet switching table : 1 entries, 1 learned
Routing instance : default-switch
    Vlan                MAC                 MAC         Age    Logical                NH        RTR
    name                address             flags              interface              Index     ID
    vlan10              88:e0:f3:72:37:01   D             -   ge-1/0/0.0             0         0

Note the internal index number of the VLAN: 

{master:0}[edit]
root@qfxsw2# run show vlans vlan10 extensive
 Routing instance: default-switch
VLAN Name: vlan10                         State: Active
Tag: 10
Internal index: 4, Generation Index: 4, Origin: Static
MAC aging time: 300 seconds
Layer 3 interface: irb.10
VXLAN Enabled : No
Interfaces:
    ge-0/0/49.0*,untagged,access
    ge-1/0/0.0*,tagged,trunk
Number of interfaces: Tagged 1    , Untagged 1
Total MAC count: 1

Confirm the VLAN and index in jnxL2aldVlanTable : 

root@qfxsw2# run show snmp mib walk jnxL2aldVlanTable
jnxL2aldVlanName.3 = default
jnxL2aldVlanName.4 = vlan10
jnxL2aldVlanName.5 = vlan20
jnxL2aldVlanTag.3 = 1
jnxL2aldVlanTag.4 = 10
jnxL2aldVlanTag.5 = 20
jnxL2aldVlanType.3 = 1
jnxL2aldVlanType.4 = 1
jnxL2aldVlanType.5 = 1
jnxL2aldVlanFdbId.3 = 196608
jnxL2aldVlanFdbId.4 = 262144
jnxL2aldVlanFdbId.5 = 327680

 Get the filtering database for index 4: 

{master:0}[edit]
root@qfxsw2# run show snmp mib walk jnxL2aldVlanFdbId
jnxL2aldVlanFdbId.3 = 196608
jnxL2aldVlanFdbId.4 = 262144
jnxL2aldVlanFdbId.5 = 327680

 Get the MAC addresses for the filtering database: 

{master:0}[edit]
root@qfxsw2#  run show snmp mib walk dot1qTpFdbPort.262144
dot1qTpFdbPort.262144.136.224.243.114.55.1 = 1011

=> The address 136.224.243.114.55.1 (decimal) is equal to 88:E0:F3:72:37:01 (hex).

 
Find the interface index: 

{master:0}[edit]
root@qfxsw2# run show snmp mib walk dot1dBasePortIfIndex | match "1011"
dot1dBasePortIfIndex.1011 = 530

Get the interface name: 

{master:0}[edit]
root@qfxsw2# run show snmp mib walk ifDescr | grep "530"
ifDescr.530   = ge-1/0/0