Some help required please.
I have a stack which contains two access switches, and an interface from switch 1 has a successful link to the core.
However, when I try adding a secondary link on switch 2 back to the core, the interface is in a suspended state.
Access Stack
switchport mode trunk
switchport nonegotiate
channel-protocol lacp
channel-group 1 mode active
Core Switch
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100,120,200,300-302,400-403,700,900-902
switchport mode trunk
no keepalive
channel-protocol lacp
channel-group 1 mode active
Access Stack Interface
GigabitEthernet3/0/47 is up, line protocol is down (suspended)
Hardware is Gigabit Ethernet, address is 40a6.e851.bb2f (bia 40a6.e851.bb2f)
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 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
82 packets input, 5248 bytes, 0 no buffer
Received 82 broadcasts (82 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 82 multicast, 0 pause input
0 input packets with dribble condition detected
0 packets output, 0 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
Core Switch Interface
GigabitEthernet0/42 is up, line protocol is down (suspended)
Hardware is Gigabit Ethernet, address is 3c08.f63a.16aa (bia 3c08.f63a.16aa)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
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 00:44:02, output 00:00:28, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 68
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
34339 packets input, 7966960 bytes, 0 no buffer
Received 5778 broadcasts (2018 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 2018 multicast, 0 pause input
0 input packets with dribble condition detected
59283 packets output, 44210435 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
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
Is there something wrong with my config that's causing this?
EDIT: On both interfaces from the core and the access stack, there is a stationary amber light which usually indicates STP has suspended the port to avoid a loop.
Port Channel 1 (Access Stack)
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 40a6.e8ba.a530 (bia 40a6.e8ba.a530)
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 2/255, rxload 20/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/0/48
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, 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: 3151
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 8118000 bits/sec, 1396 packets/sec
5 minute output rate 1141000 bits/sec, 939 packets/sec
7569694044 packets input, 3273308277235 bytes, 0 no buffer
Received 3873169150 broadcasts (2541283760 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 2541283760 multicast, 0 pause input
0 input packets with dribble condition detected
2240014676 packets output, 349722616455 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
Port Channel 1 (Core Switch)
Port-channel1 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 3c08.f63a.1682 (bia 3c08.f63a.1682)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 21/255, rxload 3/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi0/2
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, 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: 430857
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1200000 bits/sec, 984 packets/sec
5 minute output rate 8536000 bits/sec, 1472 packets/sec
5529865138 packets input, 817634236496 bytes, 0 no buffer
Received 115285777 broadcasts (109549995 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 109549995 multicast, 0 pause input
0 input packets with dribble condition detected
17791035271 packets output, 7051584854682 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
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
Etherchannel Summary (Core)
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi0/2(P) Gi0/3(w) Gi0/42(s)
2 Po2(SU) LACP Gi0/47(P) Gi0/48(P)
3 Po3(SU) LACP Te1/1(P) Te1/2(P)
Etherchannel Summary (Stack)
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi1/0/48(P) Gi2/0/48(D) Gi3/0/47(s)
channel-group 1 mode activeon both interfaces