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SNMP port-to-interface

Created by dave. Last edited by dave, 7 years and 20 days ago. Viewed 9,227 times. #2
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(Note to Googlers: I'm more than a little surprised to get so many hits on this page so soon. To add context to this, this is an example, emailed to me by the JTAC while I was trying to troubleshoot my SNMP query sequence with EX2200 switches. I stuck it here so I could refer to it. I'm trying to write a script that automates this, but it is nowhere near ready enough to even mention even in a forum like this, let alone publish.)

*         To see Mac addresses on vlans other than default.

o root@JUNIPER> show snmp mib walk 1.3.6.1.2.1.17.7.1.2.2

regress@EX4200-2> show ethernet-switching table Ethernet-switching table: 9 entries, 3 learned VLAN MAC address Type Age Interfaces default * Flood - All-members default 00:23:9c:0a:4b:2e Learn 0 ge-0/0/23.0 LC-vlan-45 * Flood - All-members customer1-vlan10 * Flood - All-members customer1-vlan10 00:1f:12:32:b7:80 Static - Router customer1-vlan10 00:1f:12:32:b7:90 Learn 0 ge-0/0/11.0 customer2-vlan20 * Flood - All-members customer2-vlan20 00:1f:12:32:b7:80 Static - Router customer2-vlan20 00:1f:12:32:b7:91 Learn 0 ge-0/0/12.0

regress@EX4200-2> show snmp mib walk dot1qVlanStaticTable dot1qVlanStaticName.2 = SL2-vlan-31 dot1qVlanStaticName.3 = SL3-vlan-31 dot1qVlanStaticName.4 = SL4-vlan-31 dot1qVlanStaticName.8 = default dot1qVlanStaticName.9 = LC-vlan-45 dot1qVlanStaticName.10 = customer1-vlan10===============FDB ID of this vlan is 10(not vlan id) dot1qVlanStaticName.11 = customer2-vlan20

show Ethernet-switching table is shown below

regress@EX4200-2> show snmp mib walk dot1qTpFdbTable dot1qTpFdbPort.8.0.35.156.10.75.46 = 536 dot1qTpFdbPort.9.0.0.0.0.0.0 = 0 dot1qTpFdbPort.10.0.0.0.0.0.0 = 0 dot1qTpFdbPort.10.0.31.18.50.183.128 = 0 dot1qTpFdbPort.10.0.31.18.50.183.144 = 524===================MAC learnt on VLAN ID 10 and MAC is 0.31.18.50.183.144 (in decimal). Convert to HEX it will be 00:1f:12:32:b7:90 on Port number 524(bridge port) dot1qTpFdbPort.11.0.0.0.0.0.0 = 0 dot1qTpFdbPort.11.0.31.18.50.183.128 = 0 dot1qTpFdbPort.11.0.31.18.50.183.145 = 525 dot1qTpFdbStatus.8.0.35.156.10.75.46 = 3 dot1qTpFdbStatus.9.0.0.0.0.0.0 = 5 dot1qTpFdbStatus.10.0.0.0.0.0.0 = 5 dot1qTpFdbStatus.10.0.31.18.50.183.128 = 4 dot1qTpFdbStatus.10.0.31.18.50.183.144 = 3 dot1qTpFdbStatus.11.0.0.0.0.0.0 = 5 dot1qTpFdbStatus.11.0.31.18.50.183.128 = 4 dot1qTpFdbStatus.11.0.31.18.50.183.145 = 3

Now check which is port 524 from dot1dBase Table

regress@EX4200-2> show snmp mib walk dot1dBase dot1dBaseBridgeAddress.0 = 00 1f 12 32 b7 80 dot1dBaseNumPorts.0 = 17 dot1dBaseType.0 = 2 dot1dBasePort.513 = 513 dot1dBasePort.515 = 515 dot1dBasePort.524 = 524=================Port 524 dot1dBasePort.525 = 525 dot1dBasePort.529 = 529 dot1dBasePort.530 = 530 dot1dBasePort.536 = 536 dot1dBasePortIfIndex.513 = 193 dot1dBasePortIfIndex.515 = 195 dot1dBasePortIfIndex.524 = 204================= IfIndex of port 524 is 204 dot1dBasePortIfIndex.525 = 205 dot1dBasePortIfIndex.529 = 208 dot1dBasePortIfIndex.530 = 209 dot1dBasePortIfIndex.536 = 215

regress@EX4200-2> show snmp mib get ifName.204 ifName.204 = ge-0/0/11.0===============================

So port ge-0/0/11.0 is the interface on which 00:1f:12:32:b7:90 is learnt for VLAN customer1-vlan10

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This is a collection of techical information, much of it learned the hard way. Consider it a lab book or a /info directory. I doubt much of it will be of use to anyone else.

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