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Cisco Bug: CSCvi63171 - First routed multicast packet has source MAC of base MAC address of the switch.

Last Modified

Dec 19, 2018

Products (1)

  • Cisco Catalyst 3750-X Series Switches

Known Affected Releases


Description (partial)

The first routed multicast packet on a 3750X has the source MAC address set to the base Ethernet MAC address of the switch/stack. Subsequent multicast routed packets have the correct source MAC address set to the MAC of the outgoing L3 instance on the 3750X switch (SVI or routed port).

The switch receives multicast traffic that needs to be routed. As part of the routing process the switch will need to perform a rewrite of the source and destination MAC address of the packet. The first packet of that multicast stream will have an incorrect rewrite of the source MAC address set to the switch/stack Ethernet Base MAC address (as seen on the "show version" output).
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