Cisco Switch uplink connection issue

[DG9]

Dear Team,

We have two switch one side c9300 and other side CBS350 and we have attach dac cable from C9300 to CBS 350 switch as a uplink , but at c9300 side dac cable not detect , CBS 350 side showing detect .

so my question is , is it supported or not , this scenario ?

Waiting for your reply...

Thanks & Regards

DG

[DG9]

Dear Team,

at C9300 side showing error disable logs..

Thanks & regards

DG

[shambhu.kumar]

Please share show interface status  switches.

Please mention which ports are connected between 9300 and CBS 350

[DG9]

Dear Sir,

at 9300 side tw1/1/1 and cbs350 side 1/0/22 connected .

but at 9300 side showing error disable .

C9300 side :- Twe1/1/1 err-disabled 1 auto auto unknown

CBS350 side :- NAME: "TenGigabitEthernet1/0/22" DESCR: "SFP-10Gbase-CX1"
PID: SFP-H10GB-CU10M VID: V01 SN: TED2114H861

Waiting for you reply...

Thanks & Regards

DG

[shambhu.kumar]

9300 side tw1/1/1

config t
interface TwentyFiveGigE1/1/1
udld port aggressive

cbs350 side 1/0/22

config t
interface TenGigabitEthernet1/0/22
udld port aggressive

show udld tw1/1/1
show udld TenGigabitEthernet1/0/22

It seems Cable issue. Can you change the cable and check.

[Hamed Fazel]

By default BPDU guard in enabled on interfaces in 9300 and maybe that cause the error-disabled.

configure that interface by below command

spanning-tree bpduguard disable
shut
no shut

[DG9]

Dear Team,

We have try to do same on c9300 interface side but no change got error disable.

Current configuration : 126 bytes
!
interface TwentyFiveGigE1/1/1
switchport mode trunk
spanning-tree bpdufilter enable
spanning-tree bpduguard disable
end

C9300 side :- Twe1/1/1 err-disabled 1 auto auto unknown

Thanks & Regards

DG

[paul driver]

Hello

Is that spanning-tree error disabled?
if so try the following--------with caution.

int x
spanning-tree bpdufilter enable
shut
no shut

[DG9]

Dear Team,

We have try to do same on c9300 interface side but no change got error disable.

Current configuration : 126 bytes
!
interface TwentyFiveGigE1/1/1
switchport mode trunk
spanning-tree bpdufilter enable
spanning-tree bpduguard disable
end

C9300 side :- Twe1/1/1 err-disabled 1 auto auto unknown

Thanks & Regards

DG

[Hamed Fazel]

please show the status of the interface with below command.

show interface TwentyFiveGigE1/1/1 switchport

[DG9]

Dear Team,

Please check below output for your reference.

Switch#sh interfaces tw1/1/1 switchport
Name: Twe1/1/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Vepa Enabled: false
App Interface: false
Appliance trust: none

Thanks & Regards

DG

[amikat]

Hi,

You may consider to issue the "show interfaces status err-disabled" command to check the actual reason why your Twe1/1/1 is err-disabled.

Best regards,

Antonin

[DG9]

Dear Team,

Please check below output for your referrence.

Switch# sh interfaces status err-disabled

Port Name Status Reason Err-disabled Vlans

Twe1/1/1 err-disabled gbic-invalid

Thanks & Regards

DG

[Hamed Fazel]

Put this command under the interface it is hidden command so type it all.

service unsupported-transceiver

Shut

No shut

[amikat]

Hi,

Thanks for the feedback. Your Cat9300 clearly does not like this SFP+ DAC. When checking the Cisco compatibility matrix (https://tmgmatrix.cisco.com/) it shows the longest passive DAC supported for C9300 is 5 meters (SFP-H10GB-CU5M), for 10 meters it requires the active DAC (SFP-H10GB-ACU10M - still copper but containing electronics).

Provided your SFP-H10GB-CU10M is not Cisco-sourced, it MAY be active in actual fact but not coded so. For that case please check your IOS XE version. The SFP-H10GB-ACU10M support should be since: IOS XE 16.8.1 for C9300-NM-2Y,
IOS XE 16.5.1 for C9300-NM-8X, IOS XE 17.1.1 for C9300-NM-2Q.

Otherwise you MAY consider to play with the "service unsupported-transceiver", "no errdisable detect cause gbic-invalid", etc. commands.

Good Luck!

Best regards,

Antonin