Hi   I've read through the datasheets of each and I cannot find anything on support for "inter-class stacking". To be specific I am building a core stack and I am planning on using 2x 9300-24UX and 2x C9500-24Y4C. Ideally I would want the core to be a single stack.   Thanks ... View more

Hi   I have 2x WS-C2960X-48LPS-L running 15.2(2)E7 IOS. I've noticed random interface flapping in the logs and I am not sure what else to check. I followed articles in here with similar issues with no luck.   This is just a short snippet of the recent logs:     105688: Jun 2 22:30:26.782: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/13, changed state to up 105689: Jun 2 22:30:27.782: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/13, changed state to up 105690: Jun 2 22:44:31.001: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/40, changed state to down 105691: Jun 2 22:44:32.001: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/40, changed state to down 105692: Jun 2 22:44:35.517: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/40, changed state to up 105693: Jun 2 22:44:36.520: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/40, changed state to up 105694: Jun 2 22:44:49.435: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/22, changed state to down 105695: Jun 2 22:44:50.435: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/22, changed state to down 105696: Jun 2 22:44:53.916: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/22, changed state to up 105697: Jun 2 22:44:54.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/22, changed state to up 105698: Jun 2 22:58:47.282: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/13, changed state to down 105699: Jun 2 22:58:48.285: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/13, changed state to down 105700: Jun 2 22:58:49.446: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/12, changed state to down   2960X-3# sh interfaces gi1/0/43 controller GigabitEthernet1/0/43 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is cc70.edfb.44ab (bia cc70.edfb.44ab) Description: AP tajnistvo Butina MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX input flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:01, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 3000 bits/sec, 3 packets/sec 5 minute output rate 2000 bits/sec, 3 packets/sec 14034288 packets input, 3295145189 bytes, 0 no buffer Received 648360 broadcasts (569772 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 569772 multicast, 0 pause input 0 input packets with dribble condition detected 29375439 packets output, 12031813200 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 pause output 0 output buffer failures, 0 output buffers swapped out Transmit GigabitEthernet1/0/43 Receive 3441879032 Bytes 3295145189 Bytes 12912032 Unicast frames 13385928 Unicast frames 12835928 Multicast frames 569772 Multicast frames 3627485 Broadcast frames 78588 Broadcast frames 0 Too old frames 3099142246 Unicast bytes 0 Deferred frames 150910311 Multicast bytes 0 MTU exceeded frames 20619779 Broadcast bytes 0 1 collision frames 0 Alignment errors 0 2 collision frames 0 FCS errors 0 3 collision frames 0 Oversize frames 0 4 collision frames 0 Undersize frames 0 5 collision frames 0 Collision fragments 0 6 collision frames 0 7 collision frames 1131137 Minimum size frames 0 8 collision frames 9311153 65 to 127 byte frames 0 9 collision frames 1048235 128 to 255 byte frames 0 10 collision frames 893648 256 to 511 byte frames 0 11 collision frames 726403 512 to 1023 byte frames 0 12 collision frames 920030 1024 to 1518 byte frames 0 13 collision frames 0 Overrun frames 0 14 collision frames 0 Pause frames 0 15 collision frames 0 Excessive collisions 0 Symbol error frames 0 Late collisions 0 Invalid frames, too large 0 VLAN discard frames 3682 Valid frames, too large 0 Excess defer frames 0 Invalid frames, too small 6555596 64 byte frames 0 Valid frames, too small 12924200 127 byte frames 1360740 255 byte frames 0 Too old frames 780107 511 byte frames 0 Valid oversize frames 242266 1023 byte frames 0 System FCS error frames 7508258 1518 byte frames 0 RxPortFifoFull drop frame 4278 Too large frames 0 Good (1 coll) frames 0 Good (>1 coll) frames 2960X-3#show cable-diagnostics tdr int gi1/0/43 TDR test last run on: June 03 09:53:56 Interface Speed Local pair Pair length Remote pair Pair status --------- ----- ---------- ------------------ ----------- -------------------- Gi1/0/43 1000M Pair A 80 +/- 10 meters Pair B Normal Pair B 80 +/- 10 meters Pair A Normal Pair C 80 +/- 10 meters Pair D Normal Pair D 80 +/- 10 meters Pair C Normal These 2 switches are used to connects end user devices, polycom phones, APs etc. I see ports flapping on both switches. Flapping ports connect to APs, trunk port to other 2960X,  as well as other devices. So no pattern there. I first noticed this on APs that would just go down after 40 days or so. Not all of them tho. Last time 1/2 went down on switch1 and 2/2 went down on switch2. Looking at the logs I noticed flaping on other ports as well.   Any ideas?   Thanks ... View more