Solved: Re: 9800-L-F SFP 10G Interfaces wont connect

AdamStewart0400 · ‎08-02-2022

I have the exact issue as the below post, albeit with different switches. The WLC side always comes UP/UP.

C9800-L-F-K9 ans Switch 3750x, no connect - Cisco Community

WLC port - Te0/1/0 connected trunk full a-1000 1000BaseSX - Te0/1/0 unassigned YES unset up up
3560 port - Gi0/15 * Connection to UK notconnect 1 auto auto 1000BaseSX SFP - GigabitEthernet0/15 unassigned YES unset down down

I have tried different SFP modules LH-SMD/SX-MMD from different revisions, different switches 3560-CX/3850 and the result is always the same.

For something so basic, I am at a loss. I could use the 4mGig ports to continue but this would be undesirable due to our core being a 4500-X.

Have I missed something blatantly obvious? Docs suggest - 2x 10 G/mGig ports. This mGig port supports speeds of 10G, 5G, 2.5G, and 1G. SFPs are compatible. Ver is Amsterdam 17.03.04c

Any ideas would be appreciated

Rich R · ‎08-02-2022

"show run int Te0/1/0" on the WLC? If you have "negotiation auto" configured change that to "no negotiation auto" - as it's not supported.
If that's the problem take a close look at the logs - it tells you but some of the messages are a bit cryptic/badly worded.
Presumably the same applies to the switch port.

The other post you linked never got a solution but the config there does show "negotiation auto" so I reckon that was the cause.

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Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
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TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs

View solution in original post

Rich R · ‎08-02-2022

"show run int Te0/1/0" on the WLC? If you have "negotiation auto" configured change that to "no negotiation auto" - as it's not supported.
If that's the problem take a close look at the logs - it tells you but some of the messages are a bit cryptic/badly worded.
Presumably the same applies to the switch port.

The other post you linked never got a solution but the config there does show "negotiation auto" so I reckon that was the cause.

------------------------------
Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
------------------------------
TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs

AdamStewart0400 · ‎08-02-2022

Hi rrudling, thankyou for the reply.

both sides are set to no negotiation auto/ switchport nonegotiate. switchport mode trunk.

Even in the 'down/down state' on the 3560-CX, making changes to the interface impacts the Link state of the WLC's Te0/1/0 port.

AdamStewart0400 · ‎08-02-2022

rrudling,

Thankyou for the pointer.

I see where i have made my mistake.

After enabling DTP debug i have realized this nonegotiate auto is not related to DTP at all. Running the command 'speed nonegotiate' on the switchport brought the trunk into life.

Many Thanks