There seems to be a little confusion... you are asking about ARP tables, and you're using OID .1.3.6.1.2.1.17.4.3.1.2; however, that OID actually is for the mac-address table in the switch.
I am assuming you know how to login to your Ubuntu server, and that NET-SNMP is installed... please let me know if you need pointers for doing this (see this question for hints about loading MIBs in linux). Some of my examples assume you have the MIBs loaded on your server... you just need to remove the -m <mib-name> option in the commands if you don't have the MIBs loaded locally.
I apologize in advance for the length of this answer... I wish polling with SNMP wasn't as complicated...
Polling the mac-address table:
If you really want the mac-address table from the switch, then remember you have to change the community string you poll with... it should be in the form of <commity@vlan>... each vlan you poll needs a different community.
In my example below, the switch at 172.16.1.210 is configured with snmp-server community public ro, and I'm polling the mac-address table in vlan-10 with dot1dTpFdbPort from BRIDGE-MIB.
[mpenning@tsunami ~]$ snmpbulkwalk -v 2c -c public@10 -OXsq 172.16.1.210 \
.1.3.6.1.2.1.17.4.3.1.2
dot1dTpFdbPort[0:6:53:fe:39:e0] 52
dot1dTpFdbPort[0:1d:a1:cd:53:46] 52
dot1dTpFdbPort[0:30:1b:bc:a7:d7] 52
dot1dTpFdbPort[0:80:c8:0:0:0] 52
dot1dTpFdbPort[38:ea:a7:6d:2e:8e] 52
dot1dTpFdbPort[80:ee:73:2f:b:40] 52
[mpenning@tsunami ~]$
In the output above, 52 is the value of dot1dBasePort, which is a number the MIB uses to index the dot1dTp table. To translate that into a normal interface name, you have to map that to an ifName... BRIDGE-MIB does that with dot1dBasePortIfIndex...
[mpenning@tsunami ~]$ snmpbulkwalk -v 2c -c public@10 -m BRIDGE-MIB 172.16.1.210 \
.1.3.6.1.2.1.17.1.4.1.2
BRIDGE-MIB::dot1dBasePortIfIndex.52 = INTEGER: 10048
[mpenning@tsunami ~]$
[mpenning@tsunami ~]$ snmpget -v 2c -c public 172.16.1.210 ifName.10048
IF-MIB::ifName.10048 = STRING: Fa0/48
[mpenning@tsunami ~]$
Thus we know that all the mac-addresses on this switch were learned through FastEthernet 0/48 in vlan-10.
Polling the active Vlans:
If you're not sure which vlans to poll on a switch, you can get that information from .1.3.6.1.4.1.9.9.46.1.3.1.1.2, which is vtpVlanState in the CISCO-VTP-MIB...
[mpenning@tsunami ~]$ snmpbulkwalk -v 2c -c public -OXsq -m CISCO-VTP-MIB 172.16.1.210 \
.1.3.6.1.4.1.9.9.46.1.3.1.1.2
vtpVlanState[1][1] operational
vtpVlanState[1][10] operational
vtpVlanState[1][1002] operational
vtpVlanState[1][1003] operational
vtpVlanState[1][1004] operational
vtpVlanState[1][1005] operational
[mpenning@tsunami ~]$
Keep in mind that Vlans 1002-1005 are internal Cisco Vlans that you should not poll.
Polling the ARP table
If you really want the ARP table from the switch, then you need to poll atPhysAddress...
[mpenning@tsunami ~]$ snmpbulkwalk -v 2c -c public -OXsq 172.16.1.210 \
.1.3.6.1.2.1.3.1.1.2
atPhysAddress[10][1.172.16.1.5] "80 EE 73 2F 0B 40 "
atPhysAddress[10][1.172.16.1.25] "38 EA A7 6D 2E 8E "
atPhysAddress[10][1.172.16.1.32] "BC 51 FE 50 16 F8 "
atPhysAddress[10][1.172.16.1.200] "00 06 53 FE 39 E0 "
atPhysAddress[10][1.172.16.1.210] "00 18 BA 51 5B 41 "
[mpenning@tsunami ~]$
Saving command output to a file
We're delving into areas that go outside the normal scope of this site, but to save the ARP table above to a file in /tmp/S01_ARP.txt, the you'd add > /tmp/S01_ARP.txt to the end of the snmpbulkwalk above...
[mpenning@tsunami ~]$ snmpbulkwalk -v 2c -c public -OXsq 172.16.1.210 \
.1.3.6.1.2.1.3.1.1.2 > /tmp/S01_ARP.txt
[mpenning@tsunami ~]$ cat /tmp/S01_ARP.txt
atPhysAddress[10][1.172.16.1.5] "80 EE 73 2F 0B 40 "
atPhysAddress[10][1.172.16.1.25] "38 EA A7 6D 2E 8E "
atPhysAddress[10][1.172.16.1.32] "BC 51 FE 50 16 F8 "
atPhysAddress[10][1.172.16.1.200] "00 06 53 FE 39 E0 "
atPhysAddress[10][1.172.16.1.210] "00 18 BA 51 5B 41 "
[mpenning@tsunami ~]$
As you see above, you can use cat in linux to get all output from a text file. NOTE: Some linux distributions (ahem... CentOS) clean out the /tmp directory on a monthly basis. You should use your HOME directory in linux to store the file. I don't remember Ubuntu cleaning out /tmp, but to be safe I'd avoid storing things there.
Miscellaneous notes about SNMP...
If you haven't loaded all Cisco's MIBs on your Ubuntu machine, then you should avoid using the -m <mib-name> flags in the snmpbulkwalk commands. Loading MIBs allows you to poll with an OID name, instead of the long dotted number...
Reference information:
I am including some show commands from the switch, in case you have questions about the CLI for the SNMP commands above...
S01#sh ver | i IOS
Cisco IOS Software, C3560 Software (C3560-IPBASEK9-M), Version 12.2(37)SE, RELEASE SOFTWARE (fc2)
S01#
S01#sh mac address-table dynamic
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
10 0006.53fe.39e0 DYNAMIC Fa0/48
10 001d.a1cd.5346 DYNAMIC Fa0/48
10 0030.1bbc.a7d7 DYNAMIC Fa0/48
10 0080.c800.0000 DYNAMIC Fa0/48
10 38ea.a76d.2e8e DYNAMIC Fa0/48
10 80ee.732f.0b40 DYNAMIC Fa0/48
Total Mac Addresses for this criterion: 6
S01#
S01#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.1.210 - 0018.ba51.5b41 ARPA Vlan10
Internet 172.16.1.200 0 0006.53fe.39e0 ARPA Vlan10
Internet 172.16.1.32 0 bc51.fe50.16f8 ARPA Vlan10
Internet 172.16.1.25 0 38ea.a76d.2e8e ARPA Vlan10
Internet 172.16.1.5 1 80ee.732f.0b40 ARPA Vlan10
S01#
