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Cisco Bug: CSCut05943 - 3850 incorrect vlan tag once using private vlans

Last Modified

Aug 04, 2017

Products (1)

  • Cisco Catalyst 3850 Series Switches

Known Affected Releases

3.7(0)E

Description (partial)

Symptom:
SW1 Gi1/0/1----TRUNK----Gi1/0/1 SW2 Gi1/0/2----TRUNK----Gi1/0/1 SW3
Gi1/0/48
|
|
Host (ISOLATED VLAN Y)

Each switch has SVI X (PRIMARY vlan). ISOLATED VLAN Y is mapped to PRIMARY VLAN X. We can ping from Host to SVI X of SW1 and SW2 but not SW3.

Conditions:
- 3850/3650 switches running cat3k_caa-universalk9ldpe.SPA.03.07.00.E.152-3.E.bin
- all switches configured with private vlans
- host configured in ISOLATED vlan and trying to communicate with host in PRIMARY vlan, while traffic has to pass between trunks on a device in the middle
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