[c-nsp] SNMP: IP => vlan + mac

[Liviu Pislaru]

Hi everyone,

I have a 3750 Cisco router, i have vlan 80 defined on it.

Interface Vlan 80
 ip address 10.11.12.1 255.255.255.0 secondary
 ip address 10.5.16.1 255.255.255.0 secondary
 ip address 10.4.3.1 255.255.255.0 secondary
 ip address 10.12.230.1 255.255.255.0 secondary
 ip address 45.46.47.1 255.255.255.0


Routing entry for 10.5.16.0/24
  * directly connected, via Vlan80


Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.5.16.7            47          0007.eb95.9b80  ARPA   Vlan80
-----------------------------------------------------------

My question here is:

Is there a posibility to obtain via SNMP a mac-address (0007.eb95.9b80) from 
arp table for IP address 10.5.16.7 ?

I know that you can obtain that via SNMP if you know vlan number.

snmpwalk  -v2c   -c public  my-router.domain.com  .1.3.6.1.2.1.4.22.1.2.
[vlan].[ip]

snmpwalk  -v2c   -c public  
my-router.domain.com  .1.3.6.1.2.1.4.22.1.2.80.10.5.16.7

But How can I obtain the vlan number via SNMP if i know an IP address ?
Example: for 10.5.16.7 to obtain vlan80.
Routing entry for 10.5.16.0/24
  * directly connected, via Vlan80

I'll appreciate any support, thancks !