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Snmp Version2 on Cat 6 supported ?

sam_manay
Level 1
Level 1

Hi All,

I use this H/W

System image file is "sup-bootdisk:s72033-ipservices_wan-mz.122-18.SXF5.bin"

cisco WS-C6504-E (R7000) processor (revision 2.0) with 983008K/65536K bytes of memory.

When doing snmpwalk using SNMP version 1 get response as follows:

[cacti@localhost cacti]# snmpwalk -v 1 -c MyString x.x.x.x .1.3.6.1.2.1.2.2.1.2

IF-MIB::ifDescr.1 = STRING: GigabitEthernet1/1

IF-MIB::ifDescr.2 = STRING: GigabitEthernet1/2

IF-MIB::ifDescr.3 = STRING: GigabitEthernet3/1

IF-MIB::ifDescr.4 = STRING: GigabitEthernet3/2

IF-MIB::ifDescr.5 = STRING: GigabitEthernet3/3

--- cut ---

But if use SNMP the version 2 , seems not responding (shown "Time Out")

[cacti@localhost cacti]# snmpwalk -v 2c -c MyString x.x.x.x .1.3.6.1.2.1.2.2.1.2

Timeout: No Response from x.x.x.x

Any idea is it because My Cat 6 doesn't support SNMP version 2, any advice?

Thanks&Regards,

sam

8 Replies 8

Joe Clarke
Cisco Employee
Cisco Employee

SNMPv2c is supported with no additional configuration. I don't know of any bugs which would cause this. If you enable "debug snmp packet" on the device then run the test, what output do you see?

Lucien Avramov
Level 10
Level 10

Can you also post your show run?

Hi,

This is the current snmp config

Router1#sh ru | i snmp

snmp-server view v1default internet included

snmp-server view v1default at excluded

snmp-server view v1default ip.21 excluded

snmp-server view v1default ip.22 excluded

snmp-server community MyString1 RO 1

snmp-server community MyString2 RO 1

snmp-server community MyString3 view v1default RO 1

snmp-server community MyString4 RW 1

snmp-server trap-source VlanXX

snmp-server enable traps snmp authentication linkdown linkup coldstart warmstart

snmp-server enable traps casa

snmp-server enable traps tty

snmp-server enable traps bgp

snmp-server enable traps config

snmp-server enable traps dlsw

snmp-server enable traps frame-relay

snmp-server enable traps hsrp

snmp-server enable traps ipmulticast

snmp-server enable traps msdp

snmp-server enable traps rtr

snmp-server enable traps syslog

snmp-server enable traps dial

snmp-server enable traps entity

snmp-server enable traps rsvp

snmp-server enable traps envmon fan shutdown supply temperature status

snmp-server enable traps voice poor-qov

snmp-server host x.x.x.x MyString1

The backgorup of using the SNMP ver 2 is to configure our NMS-cacti in order to

support traffic monitoring more than 100 Mbps. The only solution that we need is to set snmp ver 2 ( which supports 64 bit).

Thanks&Regards,

Sam

What community string are you using now? I would strongly recommend you remove all the v1default view customizations. If you need a custom view, create a new one. Do not override v1default.

Also, can you post the output of "debug snmp packet" when reproducing this problem?

Hi,

I removed all v1 default as suggested, but snmp ver still wasn't not working.

If I issue this command:

"debug snmp packet"

How much utilization taken by this proccess?

Because the current unit is running on production.

Thanks&Regards,

Sam

It depends on the amount of SNMP traffic the device is receiving. If a lot of polling is being done, then it can increase device load substantially.

Hi,

Any other alternative solution? Since you confirmed that the current IOS is being used can still support snmp ver 2.

Thanks&Regards,

Sam

Without seeing how the packets are being interpreted by the switch, I cannot say why this is happening. I cannot reproduce internally. You might try increasing the SNMP timeout in your snmpwalk tool. Try 10 seconds to see if it makes a difference.

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