topic Configuring SNMP on a 7400 Series Switch in ExtremeSwitching (VSP/Fabric Engine)

Configuring SNMP on a 7400 Series Switch

tommyt — Tue, 12 Dec 2023 07:23:58 GMT

I cant seem to get SNMP working on one our Core Switches.

Model: 7400 Series
Version: 8.4

SNMP works on the second core switch, which is the exact same model,version and on the same subnet

Below is the configuration on the non-working switch:

Am i missing something?

Re: Configuring SNMP on a 7400 Series Switch

TQU — Tue, 12 Dec 2023 13:59:16 GMT

Hi Tommyt,

Did you check the boot flag "snmp-block" ? #show boot config flags

How are you reaching the VSP mgmt through mgmt vlan interface ? Any difference with the second VSP ? Is the non working VSP host the gw of the Vlan ? Is the SNMP request came from the same subnet ?

Can you share your SNMP request you try ?

Your configuration looks strange, you define a group "v1v2grp" without auth/priv and without read or write view.

Are you using default community (public/private) ?

Regards,

Théo

Re: Configuring SNMP on a 7400 Series Switch

tommyt — Wed, 13 Dec 2023 08:13:43 GMT

Hi TQU,

The boot flag on both switches is "flags block-snmp false".
We are reaching the VSP mgmt through the mgmt vlan address on both switches.
The SNMP request is coming from a different subnet and ive checked that there are no firewall rules or ACLs in place to block anything
We have tried a test snmp walk to both Switches and only one of the switches responds
Here is the config from the working switch
snmp config from working switchsnmp config from working switchsnmp config from working switch

Re: Configuring SNMP on a 7400 Series Switch

tommyt — Wed, 13 Dec 2023 08:27:55 GMT

HI Theo,

I did not configure the working switch, all i did was work on the non-working switch.
In an attempt to get it "the same as the other switch" , i removed whatever community and group that was configured, and then reconfigured the group following this Guide from the Extreme website

Also Attached are outputs of "show snmp-server community" and "show snmp-server group" of both switches

non-working switches "group: outputworking switch's "group" outputnon-working switch's "community outputworking switch's "community" output

Re: Configuring SNMP on a 7400 Series Switch

TQU — Wed, 13 Dec 2023 08:33:48 GMT

Hi Tommy,

And where is routed the SNMP request ? directly on VSP or on another device ?

I'm thinking that the non working VSP is the gateway (it route packet to mgmt vlan) and this is why it doesn't work. You can reach the mgmt vlan interface only from the vlan. If you are routed localy, you need to use the mgmt CLIP interface.

To confirme it, you can try to request it from the same subnet or to create a mgmt CLIP interface.

If you are in VRRP config (without backup-master), you can try to move VRRP Master on the other VSP (to be routed on the working one) and working/ non-working VSP should be inversed.

Regards,

Théo

Re: Configuring SNMP on a 7400 Series Switch

tommyt — Mon, 18 Dec 2023 08:35:04 GMT

Hi Theo,

Its worth checking. but i dont think i even have it set up correctly. could you provide me with an example of how you would set up snmp on these switches/

Thanks