I was aware it was a split stack, but on looking at the config I didn't notice the link was aggregated, thank you for pointing that out.
in my defence I was in a very dark pokey walk in storage cupboard with the switches in blistering heat as their air con had packed up with sweat dripping into my eyes using a mobile phone light to see :(
My (now wrong) assumption at the time was we had two cisco trunks coming in from the core switch split across the stack relying on STP to shut one down for redundancy, because there is another fibre link in the 3750 which is dead but connected, I'd assumed the other fibre link went into our PE department where we have another stack (how wrong you can be when sweating to death)
However what you've pointed out does complicate things
Seeing as the core switch is seen as one switch is it possible to configure the HP switch to take the existing configured port channel in standalone mode as a single switch ?
ie/ bring the other fibre link into the single HP switch ?
and would I have to reconfigure the core switch to LACP ?
Smoothwall side of internet connection etherchannel
Port-channel12 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 001e.f6dc.aa02 (bia 001e.f6dc.aa02)
MTU 1500 bytes, BW 2000000 Kbit, 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, link type is auto, media type is unknown
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/0/2 Gi2/0/2
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:03:59, 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 2051000 bits/sec, 555 packets/sec
5 minute output rate 865000 bits/sec, 405 packets/sec
1924445647 packets input, 787428244684 bytes, 0 no buffer
Received 168898654 broadcasts (135649217 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 135649217 multicast, 0 pause input
0 input packets with dribble condition detected
2273622492 packets output, 2127411055358 bytes, 0 underruns
0 output errors, 0 collisions, 1 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
Corresponding Port Channel on core switch
Port-channel10 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 001f.9dba.360c (bia 001f.9dba.360c)
Description: ****LC_GND_FLR****
MTU 1500 bytes, BW 2000000 Kbit, 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, link type is auto, media type is unknown
Media-type configured as connector
input flow-control is off, output flow-control is unsupported
Members in this channel: Gi1/0/12 Gi2/0/12
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:05:25, 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 896000 bits/sec, 410 packets/sec
5 minute output rate 2024000 bits/sec, 548 packets/sec
2273659041 packets input, 2127421403480 bytes, 0 no buffer
Received 32081202 broadcasts (31287959 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 31287959 multicast, 0 pause input
0 input packets with dribble condition detected
1924496499 packets output, 787450331464 bytes, 0 underruns
0 output errors, 0 collisions, 4 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