[ixpmanager] SNMP polling information failed or there are no Ethernet ports error after upgrading to 6.2

[aleksandr at speed-ix.net]

Hello,

After upgrading to IXP manager v6.2, we got error "SNMP polling information failed or there are no Ethernet ports on this switch" for each switch added to manager while doing "View/Edit Ports (via SNMP poll)" in WebUI. In the log, I see something like this:
```
[2022-03-15 16:11:10] production.INFO:  [SER-NIK-TR2] Platform: Found Model: CE6870-48S6CQ-EI
[2022-03-15 16:11:10] production.INFO:  [SER-NIK-TR2] Platform: Found Os: Huawei VRP
[2022-03-15 16:11:10] production.INFO:  [SER-NIK-TR2] Platform: Updating OsDate from  to Unknown
[2022-03-15 16:11:10] production.INFO:  [SER-NIK-TR2] Platform: Found OsVersion: 8.191
[2022-03-15 16:11:10] production.INFO:  [SER-NIK-TR2] Platform: Found SerialNumber: (not implemented)
[2022-03-15 16:11:12] production.INFO:  - SER-NIK-TR2 - found pre-existing port for ifIndex 4
[2022-03-15 16:11:12] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating Name from [] to [MEth0/0/0]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating IfName from [] to [MEth0/0/0]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating IfHighspeed from [] to [10]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating IfMtu from [] to [1500]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating IfPhysAddress from [] to [F4DEAF353290]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating IfAdminStatus from [] to [1]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating IfOperStatus from [] to [2]
[2022-03-15 16:11:13] production.INFO: [SER-NIK-TR2]:MEth0/0/0 [Index: 4] Updating MauType from [] to [(empty)]
...
the same output for all ports on the switch
```
At the same time, "Live Ports States (via SNMP poll)" works well, I can run CLI command "./artisan switch:snmp-poll <switch>" with no error and database is updating after this if there was any changes. 

We use Huawei CloudEngine switches, all ports have ifType ethernetCsmacd (6), so default configuration includes these port type (https://docs.ixpmanager.org/usage/switches/#snmp-and-port-types-iftype).
SNMP configuration is correct, as it's working for Live Stats and in CLI (also checked via snmpwalk)

Could someone let me know what I'm missing and what should I check more?

If you need any extra info from me just let me know.

With kind regards, Aleksandr Belytskyi

NOC engineer
Speed Internet Exchange
Phone: +31(0)887378399
More: https://speed-ix.net/about-speed-ix/
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