Hello all,
I have a question about interface drops/discards. The setup uses 3 x Aruba 8320's connected in a triangle. The switches are used for connecting devices from our Facility Management department like building automation, camera's, or climate controls:
DC1 ---- DC2
\ /
buildingswitchA
The buildingswitchA has a redundant uplink to each datacenter. All switches are only used for switching purposes (so no routing) and are configured identical (except name and management IP). The Spanning-Tree Protocol root is DC1. Each switch is connected with 10 Gbs.
Each interface is configured identical like this:
interface 1/1/47
no shutdown
description Uplink DC2
no routing
vlan trunk native 49 tag
vlan trunk allowed 49,201-202,205-210
exit
interface 1/1/48
no shutdown
description Uplink DC1
no routing
vlan trunk native 49 tag
vlan trunk allowed 49,201-202,205-210
exit
My issue is I have lots of drops on the buildingswitchA interface 1/1/47 connected to DC2.
buildingswitchA# show interface 1/1/47
Interface 1/1/47 is up
Admin state is up
Description: Uplink DC2
Hardware: Ethernet, MAC Address: d0:67:26:4a:d2:4f
MTU 1500
Type SFP+LR
qos trust none
Speed 10000 Mb/s
Auto-Negotiation is off
Flow-control: off
Error-control: off
VLAN Mode: native-tagged
Native VLAN: 49
Allowed VLAN List: 49,201-202,205-210
Rx
852720214 input packets 121828184506 bytes
0 input error 174265511 dropped
0 CRC/FCS
Tx
138679 output packets 16641311 bytes
0 input error 880932904 dropped
0 collision
buildingswitchA# show interface 1/1/48
Interface 1/1/48 is up
Admin state is up
Description: Uplink DC1
Hardware: Ethernet, MAC Address: d0:67:26:4a:d2:4e
MTU 1500
Type SFP+LR
qos trust none
Speed 10000 Mb/s
Auto-Negotiation is off
Flow-control: off
Error-control: off
VLAN Mode: native-tagged
Native VLAN: 49
Allowed VLAN List: 49,201-202,205-210
Rx
16826330589 input packets 1214134301580 bytes
0 input error 54593 dropped
0 CRC/FCS
Tx
33689391412 output packets 49328323399192 bytes
0 input error 17 dropped
0 collision
All other ports on both DC1 and DC2 links, or any of the other 1/1/1-1/1/46 ports on the buildingswitchA do not show such numbers. I understand drops/discards are normal in switching, but I cannot explain why the buildingswitchA has so many. I have another buildingswitchB which shows the exact same behaviour. Our other buildingswitchesC-H we use are Aruba 3810M's but they do not show this issue at all (all those uplink interfaces show no drops).
Can anyone explain what I'm seeing, or help me how I can troubleshoot this issue, on the Aruba 8320 buildingswitchA?
Kind regards,
Niels Mejan
University of Twente