For some additional information, here is the stacking interface information for the switch having the issues first (#6)
(ArubaS2500-48T-1) #show stacking interface member 6
(ArubaS2500-48T-1) #show stacking interface member 6
Member-id: 6
------------
stack1/2
--------
stack1/2 is administratively Enabled, link is Up, line protocol is Up
Speed: 10 Gbps, MTU: 9224 bytes, Link flaps: 11
Last update of counters: 0d 00:00:06 ago
Last clearing of counters: 1d 02:46:17 ago
Link status last changed: 0d 02:08:43 ago
Statistics:
Received 16793846 frames, 8947886195 octets
110 pps, 372.316 Kbps
2425855 broadcasts, 0 runts, 0 giants, 0 throttles
1440258389 error octets, 1150308 CRC frames
1976477 multicast, 12391514 unicast
Transmitted 4126913 frames, 1055738067 octets
38 pps, 47.992 Kbps
53629 broadcasts, 0 throttles
62818 multicast, 4010466 unicast
0 errors octets, 0 deferred
0 collisions, 0 late collisions
stack1/3
--------
stack1/3 is administratively Enabled, link is Up, line protocol is Up
Speed: 10 Gbps, MTU: 9224 bytes, Link flaps: 0
Last update of counters: 0d 00:00:06 ago
Last clearing of counters: 1d 02:46:17 ago
Link status last changed: 1d 02:46:06 ago
Statistics:
Received 1612300 frames, 551209269 octets
7 pps, 16.282 Kbps
42512 broadcasts, 0 runts, 0 giants, 0 throttles
0 error octets, 0 CRC frames
44586 multicast, 1525202 unicast
Transmitted 13321788 frames, 6267769637 octets
74 pps, 134.777 Kbps
2413133 broadcasts, 0 throttles
1713922 multicast, 9194733 unicast
0 errors octets, 0 deferred
0 collisions, 0 late collisions
And the switch that is upstream from it (#0)
(ArubaS2500-48T-1) #show stacking interface member 0
Member-id: 0
------------
stack1/2
--------
stack1/2 is administratively Enabled, link is Up, line protocol is Up
Speed: 10 Gbps, MTU: 9224 bytes, Link flaps: 0
Last update of counters: 0d 00:00:05 ago
Last clearing of counters: 1d 02:39:34 ago
Link status last changed: 1d 02:39:11 ago
Statistics:
Received 56947987 frames, 54699813651 octets
127 pps, 192.406 Kbps
2314117 broadcasts, 0 runts, 0 giants, 0 throttles
0 error octets, 0 CRC frames
2806303 multicast, 51827567 unicast
Transmitted 50327620 frames, 58834986351 octets
92 pps, 305.929 Kbps
224151 broadcasts, 0 throttles
257943 multicast, 49845526 unicast
0 errors octets, 0 deferred
0 collisions, 0 late collisions
stack1/3
--------
stack1/3 is administratively Enabled, link is Up, line protocol is Up
Speed: 10 Gbps, MTU: 9224 bytes, Link flaps: 9
Last update of counters: 0d 00:00:05 ago
Last clearing of counters: 1d 02:39:34 ago
Link status last changed: 0d 02:08:37 ago
Statistics:
Received 4126729 frames, 1055705275 octets
38 pps, 139.896 Kbps
53628 broadcasts, 0 runts, 0 giants, 0 throttles
0 error octets, 0 CRC frames
62817 multicast, 4010284 unicast
Transmitted 18055012 frames, 10422960266 octets
78 pps, 106.027 Kbps
2462964 broadcasts, 0 throttles
2037540 multicast, 13554508 unicast
0 errors octets, 0 deferred
0 collisions, 0 late collisions
stack 1/3 on #0 is the upstream port to stack 1/2 on #6