topic RE: DropReasons in ExtremeWireless (WiNG)

DropReasons

Aviv_Kedem — Tue, 20 Mar 2018 13:17:00 GMT

Our AP's configured with trunk (3 tagged vlans) on eth side and we have about 500 per sec of these dropreasons:

1
DropReason: bc/mc to radio unneeded(218)
SAMPLE:

----------------------------------------------------------------------
Packet 14:
Time: 8:55:39.507589, Len: 127, 802.3, Proto: 0x0800, Vlan: 500, Priority: 0, Ingress: ge1, l3_off: 18, l4_off: 38
DropReason: bc/mc to radio unneeded(218)
802.3: XX-XX-XX-5C-6E-80 > FF-FF-FF-FF-FF-FF, 802.11p pri 0, 802.11q vlan 500, protocol 0x0800
IPv4: XX.XX.2.72 > XX.XX.3.255, proto UDP, IPv4 length 109, DSCP 0, Id 0, DF
UDP: ports 9956 > 9956, data length 89
----------------------------------------------------------------------

Why should I see this kind of dropreasons?

2
DropReason: non-[port] member vlan(205)
Why should I see the dropped packets from the vlans that NOT configured on ge1 switchport configuration ?

Thanks,

Aviv Kedem

RE: DropReasons

Daren_E — Tue, 20 Mar 2018 23:58:00 GMT

Hi Aviv,

We want to forward as little unessary traffic into the air as possible.
The firewall will drop certain traffic (Mainly broadcast multicast) that should not be forwarded into the air.
Which is why we always recommend that the firewall and Proxy arp always be enabled.

In regard to question 2:

You are most likely trunking and on the L2 side you might be allow vlans that are not configured on the WiNG device.
In this case you will need to prune the traffic, only allow (from the L2 switch) vlans that are maps/configured on the APs Ge1 port(s).

RE: DropReasons

Aviv_Kedem — Tue, 20 Mar 2018 23:58:00 GMT

Hello Daren,

In regard to question 2 - OK

Can I check the amount of airtime in use (in percents) per radio?

Thanks

RE: DropReasons

Alona — Tue, 20 Mar 2018 23:58:00 GMT

You can check channel utilization average. Airtime - not really.

In regards to question 1 - we will drop any broadcast that's not needed on the air - like arp for known client ot broadcast that came from the air - will not be sent back.

RE: DropReasons

Aviv_Kedem — Tue, 20 Mar 2018 23:58:00 GMT

Thank you Alona,

May be I can check the radio buffer occupation by size or percentage ?

I think it's very strange that we don't have any indication about it on WING OS.
It's the most important resourse of AP.

Thanks

RE: DropReasons

Aviv_Kedem — Tue, 20 Mar 2018 23:58:00 GMT

Any ideas?

Thanks

RE: DropReasons

Aviv_Kedem — Tue, 20 Mar 2018 23:58:00 GMT

Any suggestions?

RE: DropReasons

Alona — Tue, 20 Mar 2018 23:58:00 GMT

All the queues in the radio h/wso radios are faster. It's effecient anymore to query the h/w queues for status.