BugZero | Cisco BugID CSCvc93561 - BVI Multicast traffic drop with Bundle or Satellit...

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BugZero | Cisco BugID CSCvc93561 - BVI Multicast traffic drop with Bundle or Satellit...

Cisco - Defect ID: CSCvc93561

BVI Multicast traffic drop with Bundle or Satellite access bundle over ICL Bundle

Cisco - Defect ID: CSCvc93561

BVI Multicast traffic drop with Bundle or Satellite access bundle over ICL Bundle

Last updated on June 14th, 2023

BugZero Risk Score
7.8 High

Overall: 7.8

Severity: 8.2

Lifecycle: 9.1

Popularity: 5.1

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Bug Details

Description

General

Bug in released code.

Symptom

Unknown unicast/broadcast traffic loss with MVPN/Multicast over IRB, with bundle AC.

Conditions

L3 multicast traffic switching to an L2 network with BVI. The AC on the bridge should be a bundle with more than 1 bundle member. Bundle members span multiple LCs. The individual slotmask calculation of the bundle will only incorporate one of the bundle members location rather than all members contribution to the slotmask.

Workaround

Make the number of the bundle members to 1. Or, migrate all bundle-members to single LC.

Further Problem Description

The bridge port information to flood traffic should contain all bundle members. However, the traffic is flooded to only the first bundle member leading to drops. This issue is SPECIFIC to L3 mutlicast or MVPN over IRB, and does NOT impact regular L2 bridging with bundle AC.

Change history

2023-06-14 Added: 6.1.31, 6.1.4, 6.1.42, 6.1.45, 6.2.1, 6.2.2, 6.2.25, 6.2.3, 6.3.1, 6.3.15, 6.3.2, 6.3.3, 6.4.0, 6.4.1, 6.4.2, 6.5.1, 6.5.15, 6.5.2, 6.5.25, 6.5.26, 6.5.28, 6.5.3, 6.5.90, 6.5.92, 6.5.93, 6.6.1, 6.6.11, 6.6.12, 6.6.2, 6.6.25, 6.6.3, 7.0.0, 7.0.1, 7.0.11, 7.0.90, 7.1.1

Links

Original Vendor Announcement

Relevant Products

Click on a version to see all relevant bugs

Affected versions:No known affected versions

Fixed versions: 6.1.31, 6.1.4, 6.1.42, 6.1.45, 6.2.1, 6.2.2, 6.2.25, 6.2.3, 6.3.1, 6.3.15, 6.3.2, 6.3.3, 6.4.0, 6.4.1, 6.4.2, 6.5.1, 6.5.15, 6.5.2, 6.5.25, 6.5.26, 6.5.28, 6.5.3, 6.5.90, 6.5.92, 6.5.93, 6.6.1, 6.6.11, 6.6.12, 6.6.2, 6.6.25, 6.6.3, 7.0.0, 7.0.1, 7.0.11, 7.0.90, 7.1.1

Relevant Products

Click on a version to see all relevant bugs

Affected versions:No known affected versions

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OPERATIONAL DEFECT DATABASE

Cisco - Defect ID: CSCvc93561

BVI Multicast traffic drop with Bundle or Satellite access bundle over ICL Bundle

Cisco - Defect ID: CSCvc93561

BVI Multicast traffic drop with Bundle or Satellite access bundle over ICL Bundle

Last updated on June 14th, 2023

BugZero Risk Score7.8 High

Bug Details

General

Symptom

Conditions

Workaround

Further Problem Description

Links

Top Cisco Defects

Ready to prevent the next vendor outage?

BugZero Risk Score
7.8 High