Cisco Bug: CSCsz40600 - 1812 switch layer3-forwards packets which layer2 should process
Feb 02, 2017
- Cisco 1800 Series Integrated Services Routers
Known Affected Releases
Symptom: 1812 switch port forward some packets by routing whereas the packets should be processed by Layer2 forwarding, when SVI(Switched Virtual Interface) has bridge-group. If two 1812 routers connect each other by switchport, and the MAC address entry for transit packet aging out, the transit packet may be duplicated for flooding and loop between two routers. This problem will be resolved by this enhancement request adding a feature of software MAC filtering. Condition: - Cisco1812 switchport(FastEthernet2 ~ FastEthernet9) - The MAC address entry for the transit packet does not exist in MAC address table due to MAC age out etc. But, the ARP entry exists in ARP cache table. Then, the transit packet is flooded to all related switch ports. As the result, the packet loop if two 1812 routers connect each other by switchport.
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Bug Details Include
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