Hi,
I've got a tricky issue with Cisco WS-C2960X-24PSQ-L. It comes brand new; only upgraded software to 15.2(7)E2 and configured a few things (ssh, passwords...) (full config at the end)
When I plug anything on uplink (ports 25 or 26), or on PoE ports (ports 1-12), everything is fine. But when I plug the same hardware on non-PoE, non-uplink, then nothing happens. The port stays down (ports 13-24).
If then I go to the CLI and "cycle" the port, it works again. Moreover, I see this behavior on 2 different switches of the same model (I sent the first one I had back to seller because I thought it was a faulty hardware...) And even better: This is persistent for that uptime (if I unplug the PC and plug it back, it works fine), but not accross reload: it I save the config and reload, port is permanently down.
Transcript of a test session (notice I do not touch the cables, only use the config...), beginning with a PC plugged on port 13, not working:
cisco#show int gi0/13
GigabitEthernet0/13 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet, address is 00a2.89f2.920d (bia 00a2.89f2.920d)
MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, 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 never, output never, 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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 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
cisco#show run int gi0/13
Building configuration...
Current configuration : 37 bytes
!
interface GigabitEthernet0/13
end
cisco#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
cisco(config)#interface gi0/13
cisco(config-if)#shutdown
Jul 27 21:31:55.724: %LINK-5-CHANGED: Interface GigabitEthernet0/13, changed state to administrati
cisco(config-if)#no shutdown
cisco(config-if)#
Jul 27 21:32:12.816: %LINK-3-UPDOWN: Interface GigabitEthernet0/13, changed state to down
cisco(config-if)#
Jul 27 21:32:16.245: %LINK-3-UPDOWN: Interface GigabitEthernet0/13, changed state to up
Jul 27 21:32:17.248: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/13, changed state to up
cisco(config-if)#end
cisco#show int gi0/13
Jul 27 21:32:26.601: %SYS-5-CONFIG_I: Configured from console by admin on vty0 (192.168.1.194)
GigabitEthernet0/13 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 00a2.89f2.920d (bia 00a2.89f2.920d)
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 never, 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 5000 bits/sec, 2 packets/sec
5 minute output rate 7000 bits/sec, 3 packets/sec
309 packets input, 67353 bytes, 0 no buffer
Received 56 broadcasts (41 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 41 multicast, 0 pause input
0 input packets with dribble condition detected
337 packets output, 181851 bytes, 0 underruns
0 output errors, 0 collisions, 2 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
cisco#
And then, as if by magic, port is up.
The full config (you'll see i've tried various configs on other failed ports, without result):
!
! Last configuration change at 23:32:26 EST Mon Jul 27 2020 by admin
!
version 15.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
no service dhcp
!
hostname cisco
!
boot-start-marker
boot-end-marker
!
enable secret 5 <redacted>
!
username admin secret 9 <redacted>
aaa new-model
!
!
aaa authentication login default local
!
!
!
!
!
!
aaa session-id common
clock timezone EST 1 0
clock summer-time EST recurring
!
!
!
!
no ip dhcp relay information check
!
!
ip domain-name <redacted>
!
!
!
!
!
!
!
crypto pki trustpoint TP-self-signed-2314378624
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-2314378624
revocation-check none
rsakeypair TP-self-signed-2314378624
!
!
crypto pki certificate chain TP-self-signed-2314378624
!
spanning-tree mode rapid-pvst
spanning-tree portfast edge bpduguard default
spanning-tree extend system-id
!
!
!
!
vlan internal allocation policy ascending
!
!
!
!
!
!
!
!
!
!
!
interface Bluetooth0
no ip address
shutdown
downshift disable
!
interface FastEthernet0
no ip address
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface GigabitEthernet0/3
!
interface GigabitEthernet0/4
!
interface GigabitEthernet0/5
!
interface GigabitEthernet0/6
!
interface GigabitEthernet0/7
!
interface GigabitEthernet0/8
!
interface GigabitEthernet0/9
!
interface GigabitEthernet0/10
!
interface GigabitEthernet0/11
!
interface GigabitEthernet0/12
!
interface GigabitEthernet0/13
!
interface GigabitEthernet0/14
!
interface GigabitEthernet0/15
switchport mode access
no cdp enable
spanning-tree portfast edge
!
interface GigabitEthernet0/16
!
interface GigabitEthernet0/17
!
interface GigabitEthernet0/18
!
interface GigabitEthernet0/19
!
interface GigabitEthernet0/20
!
interface GigabitEthernet0/21
!
interface GigabitEthernet0/22
!
interface GigabitEthernet0/23
spanning-tree portfast edge
!
interface GigabitEthernet0/24
spanning-tree portfast edge
!
interface GigabitEthernet0/25
!
interface GigabitEthernet0/26
!
interface GigabitEthernet0/27
!
interface GigabitEthernet0/28
!
interface Vlan1
ip address 192.168.1.254 255.255.255.0
!
ip default-gateway 192.168.1.1
!
ip http server
ip http secure-server
ip ssh time-out 60
ip ssh logging events
ip ssh version 2
!
!
!
!
!
!
line con 0
line vty 5 15
!
!
end
Any idea how I can use that switch? I mean, if the power goes down (it does rarely due to UPS, but sh** happens) I lose all 12 ports until I can manually go to console and restart them one by one... What config do I miss? Or is it a bug in latest IOS?
To summarise my investigations:
- Not a port config issue (port 12 and 13 share the same config, not same behavior)
- Not a faulty hardware (or i'm really unlucky): 2 separate switches show the same behavior
- Not a faulty cable (same cable on different port work fine, tested 6 cables)
- Not a client config or hardware issue (tested 4 NICs (TP Link, Intel, Broadcom, Apple) with 4 very different OSs (macOs, Linux, Windows, FreeBSD)
What else?
Many thanks,
Mathieu
