CODEWITHSUNDEEP
snmpmac-address
Milan Lenco
Milan Lenco

Reputation: 95

SNMP - get complete Mac table in one call

For my project I need to download mac table from switch and do it as fast as possible. Official solution is kind of slow. It requires to get list of all Vlan's, and for each one trigger separate call of snmpwalk with OID=.1.3.6.1.2.1.17.4.3.1.1 and community string indexed with vlan number. It can take significant amount of time, since number of vlan's on our switches ranges in tens. Is there a way to get all mac addresses from mac table at once(some special community index representing all available vlan indexes)? Thanks in advance..

Upvotes: 3

Views: 27701

Answers (2)

FrBrGeorge
FrBrGeorge

Reputation: 730

I think BRIDGE-MIB::dot1dTpFdbTable (1.3.6.1.2.1.17.4.3) will do the job. One can simply retrieve dot1dTpFdbPort (1.3.6.1.2.1.17.4.3.1.2) to retrieve learned MAC -> PORT table. For my DLINK DGS-1216T I can get mac-to-port table from my Linux box by this command:

$ snmpwalk -O0sUX -v2c -Cc -c public 192.168.0.1 BRIDGE-MIB::dot1dTpFdbPort

Additionally I found extra (17th) port number for maintenance MAC.

Upvotes: 7

JPBlanc
JPBlanc

Reputation: 72680

Do you try to retreive the ipNetToMediaTable ({iso(1) identified-organization(3) dod(6) internet(1) mgmt(2) mib-2(1) ip(4) ipNetToMediaTable(22)} or 1.3.6.1.2.1.4.22) from your switch management address. It represents the IP Address Translation table used for mapping from IP addresses to physical addresses.

----EDIT----

If you want to Use SNMP to Find a Port Number from a MAC Address on a Catalyst Switch with a minimum of frames you can us a Get-Bulk PDU, it assume that you switch is SNMP V2c.

Upvotes: 1

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