C9300-48T-E 25G interface can't up

[shiran.wang]

Cisco C9300 switch 25G interface can't up, TW1/1/2 is configure interface which connect to C9500 switch 25G interface,

TW1/1/1 connect to TW2/1/1 is not configure interface also can't up,

what special configure need under this interface to bring it up.

configure as below (seems it can not detect connect cable)

interface Port-channel1
description To_C9500_TBITCSW01
switchport mode trunk

interface FortyGigabitEthernet2/1/1
!
interface FortyGigabitEthernet2/1/2
!
interface TwentyFiveGigE2/1/1
!
interface TwentyFiveGigE2/1/2
switchport mode trunk
channel-protocol pagp
channel-group 1 mode auto

interface FortyGigabitEthernet1/1/1
!
interface FortyGigabitEthernet1/1/2
!
interface TwentyFiveGigE1/1/1
!
interface TwentyFiveGigE1/1/2
switchport mode trunk
channel-protocol pagp
channel-group 1 mode auto

TwentyFiveGigE1/1/2 is down, line protocol is down (notconnect)
Hardware is Twenty Five Gigabit Ethernet, address is 4cbc.489c.ae40 (bia 4cbc.489c.ae40)
MTU 1500 bytes, BW 25000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 25Gb/s, link type is auto, media type is SFP-25GBase-SR
Fec is auto
input flow-control is on, 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: 0/2000/0/0 (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, 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

[Mark Malone]

Hi
what type of fiber is running between them MMF or twinax ?
same problem when not in a Port-channel setup ?

[balaji.bandi]

What is the distance between Cat 9300 and Cat 9500 ?

here is the distance support for SR

https://www.cisco.com/c/dam/en/us/products/collateral/interfaces-modules/transceiver-modules/at-a-glance-c45-739941.pdf

if that is below your distance try, with out Trunk or Port-channel (like p2p interface see if the interface come up.)

[Leo Laohoo]

What firmware is the switch running on?
Post the complete output to the command "sh license feat".

[thor.smith]

I think you need to configure the tw1/1/2 interface with the command “speed no negotiation”   You may need to configure you port channel interface with this command as well.  

[Diana Karolina Rojas]

Hello!

Did you find the cause of your problem?

Best Regards,

[thor.smith]

Yes I did.

[Diana Karolina Rojas]

Can you provide me your solution?, I am having the same issue right now.

Best Regards,

[thor.smith]

Good afternoon,

I used the "speed nonegotiate" command on the involved interfaces on the C9300 switch. That resolved the issue and the interfaces connected. I also had some 10/25 Gig SFPs that weren't working. I found they required on the C9300 the "speed nonegotiate" command on the involved interfaces and the FEC had to be set to c174 for these to work.

[Diana Karolina Rojas]

Thank you so much! I will try that, we have a link between a C9500 and a C9300, in the 9500 side we can change the FEC, but in the C9300 we can't, the command is not accepted inside the interface, I am starting to think that the IOS version we are running is wrong because we have another identical device with newer version and takes the command without problem.

Thank you!

[thor.smith]

IOS version might be why you can't run the command. When I did this it was on a Cisco C9300-48T switch running IOS 16.9.4 with Uplink Module C9300-NM-2Y 2x25G

[balaji.bandi]

have you tried no speed negotiation.