BugZero | Cisco BugID CSCvh79448 - 3850 mGRE: counter errors with removing tunnel int...

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BugZero | Cisco BugID CSCvh79448 - 3850 mGRE: counter errors with removing tunnel int...

ODD
Cisco
CSCvh79448

Cisco - Defect ID: CSCvh79448

3850 mGRE: counter errors with removing tunnel interface and adding it back

ODD
Cisco
CSCvh79448

Cisco - Defect ID: CSCvh79448

3850 mGRE: counter errors with removing tunnel interface and adding it back

Last updated on March 2nd, 2021

BugZero Risk Score
7.7 High

Overall: 7.7

Severity: 8.2

Lifecycle: 9.1

Popularity: 3.7

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Bug Details

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Description

Symptom

GRE tunnel interface is showing huge counters after removing the GRE tunnel interface and adding the configuration of the interface back.

Conditions

Create a GRE/mGRE tunnel and send traffic so that packet/byte counters show non-zero stats. Now unconfigure and configure the tunnel (using same tunnel index). This causes the packet/byte counters for the tunnel to show abnormally large garbage values.

Workaround

issue the command "clear counter"

Further Problem Description

Issue is due to not initializing the counter values cached in forwarding layer, which triggers a counter update with negative values to ios.

Change history

2021-03-02 Added: 16.8.1

Links

Original Vendor Announcement

Relevant Products

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Affected versions:16.8.1

Fixed versions: 16.10.1, 16.10.1a, 16.10.1b, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1i, 16.10.1s, 16.10.2, 16.10.3, 16.6(3.25), 16.6.4, 16.6.4a, 16.6.4s, 16.6.5, 16.6.5a, 16.6.5b, 16.6.6, 16.6.7, 16.6.7a, 16.6.8, 16.6.9, 16.8(1.23), 16.8.2, 16.8.3, 16.9(0.67), 16.9.1, 16.9.1a, 16.9.1b, 16.9.1c, 16.9.1d, 16.9.1s, 16.9.2, 16.9.2a, 16.9.2s, 16.9.3, 16.9.3a, 16.9.3h, 16.9.3s, 16.9.4, 16.9.4c, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, Everest-16.6.4, Fuji-16.8.2, Fuji-16.9.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:16.8.1

Fixed versions: 16.10.1, 16.10.1a, 16.10.1b, 16.10.1c, 16.10.1d, 16.10.1e, 16.10.1f, 16.10.1g, 16.10.1i, 16.10.1s, 16.10.2, 16.10.3, 16.6(3.25), 16.6.4, 16.6.4a, 16.6.4s, 16.6.5, 16.6.5a, 16.6.5b, 16.6.6, 16.6.7, 16.6.7a, 16.6.8, 16.6.9, 16.8(1.23), 16.8.2, 16.8.3, 16.9(0.67), 16.9.1, 16.9.1a, 16.9.1b, 16.9.1c, 16.9.1d, 16.9.1s, 16.9.2, 16.9.2a, 16.9.2s, 16.9.3, 16.9.3a, 16.9.3h, 16.9.3s, 16.9.4, 16.9.4c, 16.9.5, 16.9.5f, 16.9.6, 16.9.7, Everest-16.6.4, Fuji-16.8.2, Fuji-16.9.1

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