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Cisco Bug: CSCuj18184 - FP leaf nodes Incorrectly learnt additional MACs per each SVIs

Last Modified

Jan 29, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.1(4)S26 6.2(5.23)S0

Description (partial)

The layer 2 and layer 3 boundary Fabric Path leaf switches are learning two additional MAC addresses per VLAN.  These two MACs are learning from the spine root switches, but on the root switches. These MACs does not exist on the MAC tables.  These MAC addresses are incorrectly learned when Nexus 7000 processes PIM hello packets. One of the MAC addresses is learned from the vPC peer.

If a large number of SVIs are defined on the switch, the extra MAC addresses consume a big chuck of MAC address table space on a F2/F2E FE (forwarding engine). As a result, the MAC address table may be exhausted.

Classical ethernet is connected to the Fabric Path network. vPC, SVI, and vPC gateway are enable on a couple of N7K vPC pair. Nexus 7000 receives a PIM hello packets. This bug applies to F2/F2E modules only.
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