BugZero | Cisco BugID CSCwc03820 - Vulcan:Brenton: 1G(CWDM/DWDM) : Link down issue wi...

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BugZero | Cisco BugID CSCwc03820 - Vulcan:Brenton: 1G(CWDM/DWDM) : Link down issue wi...

ODD
Cisco
CSCwc03820

Cisco - Defect ID: CSCwc03820

Vulcan:Brenton: 1G(CWDM/DWDM) : Link down issue with port Tw2/0/8.

ODD
Cisco
CSCwc03820

Cisco - Defect ID: CSCwc03820

Vulcan:Brenton: 1G(CWDM/DWDM) : Link down issue with port Tw2/0/8.

Last updated on February 22nd, 2026

BugZero Risk Score
7.8 High

Overall: 7.8

Severity: 8.2

Lifecycle: 9.1

Popularity: 4.6

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Bug Details

Description

Symptom

Port stays in not-connected state, even though different 1G SFP’s are connected, but opposite port comes up fine.

Conditions

1. on C9600 2. insert SFP

Workaround

na

Further Problem Description

Change history

2026-01-11 Added: 17.10.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.10.1

Fixed versions: 17.10.1, 17.10.1a, 17.10.1b, 17.11.1, 17.11.1a, 17.12.02a, 17.12.1, 17.12.1a, 17.12.1w, 17.12.1x, 17.12.1y, 17.12.1z, 17.12.1z1, 17.12.1z2, 17.12.1z3, 17.12.1z4, 17.12.1z5, 17.12.1z6, 17.12.2, 17.12.2a, 17.12.3, 17.12.3a, 17.12.4, 17.12.4a, 17.12.4b, 17.12.5, 17.12.5a, 17.12.5b, 17.12.5c, 17.12.5d, 17.12.6, 17.12.6a, 17.12.6b, 17.13.1, 17.13.1a, 17.14.1, 17.14.1a, 17.15.1, 17.15.1a, 17.15.1b, 17.15.1w, 17.15.1x, 17.15.1y, 17.15.1z, 17.15.2, 17.15.2a, 17.15.2b, 17.15.2c, 17.15.3, 17.15.3a, 17.15.3b, 17.15.4, 17.15.4a, 17.15.4b, 17.15.4c, 17.15.4d, 17.15.4s1, 17.15.5, 17.16.1, 17.16.1a, 17.17.1, 17.18.1, 17.18.1a, 17.18.1w, 17.18.1x, 17.18.2, 17.6.6, 17.6.6a, 17.6.7, 17.6.8, 17.6.8a, 17.9.3, 17.9.3a, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, 17.9.5b, 17.9.5c, 17.9.5d, 17.9.5e, 17.9.5f, 17.9.6, 17.9.6a, 17.9.6b, 17.9.7, 17.9.7a, 17.9.7b, 17.9.8, Bengaluru-17.6.6, Cupertino-17.9.3, Dublin-17.10.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:17.10.1

Fixed versions: 17.10.1, 17.10.1a, 17.10.1b, 17.11.1, 17.11.1a, 17.12.02a, 17.12.1, 17.12.1a, 17.12.1w, 17.12.1x, 17.12.1y, 17.12.1z, 17.12.1z1, 17.12.1z2, 17.12.1z3, 17.12.1z4, 17.12.1z5, 17.12.1z6, 17.12.2, 17.12.2a, 17.12.3, 17.12.3a, 17.12.4, 17.12.4a, 17.12.4b, 17.12.5, 17.12.5a, 17.12.5b, 17.12.5c, 17.12.5d, 17.12.6, 17.12.6a, 17.12.6b, 17.13.1, 17.13.1a, 17.14.1, 17.14.1a, 17.15.1, 17.15.1a, 17.15.1b, 17.15.1w, 17.15.1x, 17.15.1y, 17.15.1z, 17.15.2, 17.15.2a, 17.15.2b, 17.15.2c, 17.15.3, 17.15.3a, 17.15.3b, 17.15.4, 17.15.4a, 17.15.4b, 17.15.4c, 17.15.4d, 17.15.4s1, 17.15.5, 17.16.1, 17.16.1a, 17.17.1, 17.18.1, 17.18.1a, 17.18.1w, 17.18.1x, 17.18.2, 17.6.6, 17.6.6a, 17.6.7, 17.6.8, 17.6.8a, 17.9.3, 17.9.3a, 17.9.4, 17.9.4a, 17.9.5, 17.9.5a, 17.9.5b, 17.9.5c, 17.9.5d, 17.9.5e, 17.9.5f, 17.9.6, 17.9.6a, 17.9.6b, 17.9.7, 17.9.7a, 17.9.7b, 17.9.8, Bengaluru-17.6.6, Cupertino-17.9.3, Dublin-17.10.1

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