Cisco Bug: CSCur12257 - L2FM OOO Static MAC issue after ISSU followed by peer-link flap
Last Modified
May 29, 2020
Products (8)
- Cisco Nexus 7000 Series Switches
- Cisco Nexus 7000 10-Slot Switch
- Cisco Nexus 7000 4-Slot Switch
- Cisco Nexus 7700 6-Slot Switch
- Cisco Nexus 7700 18-Slot Switch
- Cisco Nexus 7000 18-Slot Switch
- Cisco Nexus 7000 9-Slot Switch
- Cisco Nexus 7700 10-Slot Switch
Known Affected Releases
6.2(8a)
Description (partial)
Symptom: HSRP VMAC for some vlans may not have G and R bit set. This will result in unicast flooding for the packets destined to HSRP vmac Broken State `show mac address-table` Legend: * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC age - seconds since last seen,+ - primary entry using vPC Peer-Link, (T) - True, (F) - False VLAN MAC Address Type age Secure NTFY Ports/SWID.SSID.LID ---------+-----------------+--------+---------+------+----+------------------ * 200 0000.0c9f.f0d0 static - F F Vlan200 Notice above G and R bit are missing. Also instead of a port it may mention vlan200 which means that it will be flooded to all the ports in that vlan Correct State `show mac address-table ` Legend: * - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC age - seconds since last seen,+ - primary entry using vPC Peer-Link, (T) - True, (F) - False VLAN MAC Address Type age Secure NTFY Ports/SWID.SSID.LID ---------+-----------------+--------+---------+------+----+------------------ G 200 0000.0c9f.f0d0 static - F F vPC Peer-Link(R) Conditions: Switchover (ISSU or even EPLD upgrade of supervisor which will cause sup failover) and then followed by flapping of peer-link (or bringing up peer-link)
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