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MAC addresses aging out in a VLAN, STP TC guard is ON
We have a Netgear M4300 stack running v12.0.13.7, although this problem was also confirmed in at least v12.0.11.15 as well.
If we turn off Spanning Tree the MAC addresses age out normally, when enabled they age out almost instantly, where two consecutive 'show mac-addr-table vlan 11' shows different entries. This however only happens with MACs learnt via the physical uplink port (2/0/21).
Nothing appears in the logs and we're guarding root and have topology change notifications blocked entering this interface. Appears to me like a bug, don't think TCNs (even if these are leaking through tcpguard), would age out MACs in less than a second though...
(M4300-24X24F) #show running-config interface 2/0/21 !Current Configuration: ! interface 2/0/21 description 'dot1q-tunnel in to vlan 11' spanning-tree guard root spanning-tree tcnguard no spanning-tree port mode mtu 12270 vlan pvid 11 vlan ingressfilter vlan participation auto 1 vlan participation include 11 exit (M4300-24X24F) #show mac-addr-table vlan 11 Address Entries Currently in Use............... 5510 MAC Address Interface Status ----------------- ----------------------- ------------ 00:C0:89:21:E9:20 2/0/21 Learned 00:C0:89:3D:52:8C 2/0/21 Learned 02:BD:36:44:92:8D lag 22 Learned 02:CE:14:AD:F7:A0 lag 22 Learned 08:55:31:30:21:C8 2/0/21 Learned 08:55:31:C1:1D:FF 2/0/21 Learned 4C:5E:0C:39:03:24 2/0/21 Learned 4C:5E:0C:C1:52:E4 lag 22 Learned 74:4D:28:05:76:C0 2/0/21 Learned 74:4D:28:07:A9:62 2/0/21 Learned 74:4D:28:07:B1:28 2/0/21 Learned C4:AD:34:6A:49:75 lag 22 Learned C4:AD:34:71:A6:8F 2/0/21 Learned C4:AD:34:85:35:2E 2/0/21 Learned C4:AD:34:85:35:30 2/0/21 Learned C4:AD:34:BD:62:9E 2/0/21 Learned CC:2D:E0:BD:4F:FC lag 28 Learned CC:2D:E0:E4:B3:86 lag 26 Learned D4:CA:6D:01:CB:BF 2/0/21 Learned E4:8D:8C:3A:C0:A4 lag 22 Learned
Working perfectly, if we however then enable STP MACs age out instantly (we hit <up arrow> <enter> in quick succession):
(M4300-24X24F) #configure (M4300-24X24F) (Config)#interface 2/0/21 (M4300-24X24F) (Interface 2/0/21)#spanning-tree port mode (M4300-24X24F) (Interface 2/0/21)#end
(M4300-24X24F) #show mac-addr-table vlan 11 Address Entries Currently in Use............... 5505 MAC Address Interface Status ----------------- ----------------------- ------------ 02:BD:36:44:92:8D lag 22 Learned 02:CE:14:AD:F7:A0 lag 22 Learned 4C:5E:0C:C1:52:E4 lag 22 Learned C4:AD:34:6A:49:75 lag 22 Learned CC:2D:E0:BD:4F:FC lag 28 Learned CC:2D:E0:E4:B3:86 lag 26 Learned E4:8D:8C:3A:C0:A4 lag 22 Learned (M4300-24X24F) #show mac-addr-table vlan 11 Address Entries Currently in Use............... 5506 MAC Address Interface Status ----------------- ----------------------- ------------ 02:BD:36:44:92:8D lag 22 Learned 02:CE:14:AD:F7:A0 lag 22 Learned 4C:5E:0C:C1:52:E4 lag 22 Learned C4:AD:34:6A:49:75 lag 22 Learned C4:AD:34:85:35:2E 2/0/21 Learned CC:2D:E0:BD:4F:FC lag 28 Learned CC:2D:E0:E4:B3:86 lag 26 Learned E4:8D:8C:3A:C0:A4 lag 22 Learned (M4300-24X24F) #show mac-addr-table vlan 11 Address Entries Currently in Use............... 5505 MAC Address Interface Status ----------------- ----------------------- ------------ 02:BD:36:44:92:8D lag 22 Learned 02:CE:14:AD:F7:A0 lag 22 Learned 4C:5E:0C:C1:52:E4 lag 22 Learned C4:AD:34:6A:49:75 lag 22 Learned CC:2D:E0:BD:4F:FC lag 28 Learned CC:2D:E0:E4:B3:86 lag 26 Learned E4:8D:8C:3A:C0:A4 lag 22 Learned
Herewith the detailed port statistics, should it prove usefull:
(M4300-24X24F) #show interface ethernet 2/0/21 switchport Port: 2/0/21 VLAN Switchport mode:General Private VLAN configured Host association: Private VLAN configured Promiscuous VLANS: Operational Private VLANS : (M4300-24X24F) #show interface ethernet 2/0/21 Total Packets Received (Octets)................ 3024704173710 Packets Received 64 Octets..................... 287 Packets Received 65-127 Octets................. 1155372332 Packets Received 128-255 Octets................ 378566382 Packets Received 256-511 Octets................ 225519018 Packets Received 512-1023 Octets............... 47300784 Packets Received 1024-1518 Octets.............. 121998893 Packets Received > 1518 Octets................. 1642070200 Packets RX and TX 64 Octets.................... 1299261 Packets RX and TX 65-127 Octets................ 1886863883 Packets RX and TX 128-255 Octets............... 1692376333 Packets RX and TX 256-511 Octets............... 355322410 Packets RX and TX 512-1023 Octets.............. 94493344 Packets RX and TX 1024-1518 Octets............. 441926937 Packets RX and TX 1519-2047 Octets............. 2564615377 Packets RX and TX 2048-4095 Octets............. 0 Packets RX and TX 4096-9216 Octets............. 0 Total Packets Received Without Errors.......... 3570010569 Unicast Packets Received....................... 3559492436 Multicast Packets Received..................... 10089972 Broadcast Packets Received..................... 428161 Receive Packets Discarded...................... 0 Total Packets Received with MAC Errors......... 0 Jabbers Received............................... 0 Fragments Received............................. 0 Undersize Received............................. 0 Alignment Errors............................... 0 FCS Errors..................................... 0 Overruns....................................... 0 Total Received Packets Not Forwarded........... 0 802.3x Pause Frames Received................... 0 Unacceptable Frame Type........................ 0 Total Packets Transmitted (Octets)............. 2315267939534 Packets Transmitted 64 Octets.................. 1298974 Packets Transmitted 65-127 Octets.............. 731491551 Packets Transmitted 128-255 Octets............. 1313809951 Packets Transmitted 256-511 Octets............. 129803392 Packets Transmitted 512-1023 Octets............ 47192560 Packets Transmitted 1024-1518 Octets........... 319928044 Packets Transmitted > 1518 Octets.............. 924877618 Max Frame Size................................. 12288 Maximum Transmit Unit.......................... 12270 Total Packets Transmitted Successfully......... 3468402092 Unicast Packets Transmitted.................... 3459971073 Multicast Packets Transmitted.................. 8204346 Broadcast Packets Transmitted.................. 226673 Transmit Packets Discarded..................... 0 Total Transmit Errors.......................... 0 Total Transmit Packets Discarded............... 0 Single Collision Frames........................ 0 Multiple Collision Frames...................... 0 Excessive Collision Frames..................... 0 802.3x Pause Frames Transmitted................ 0 GVRP PDUs received............................. 0 GVRP PDUs Transmitted.......................... 0 GVRP Failed Registrations...................... 0 GMRP PDUs Received............................. 0 GMRP PDUs Transmitted.......................... 0 GMRP Failed Registrations...................... 0 STP BPDUs Transmitted.......................... 0 STP BPDUs Received............................. 0 RSTP BPDUs Transmitted......................... 0 RSTP BPDUs Received............................ 32 MSTP BPDUs Transmitted......................... 34 MSTP BPDUs Received............................ 0 EAPOL Frames Transmitted....................... 0 EAPOL Start Frames Received.................... 0 Load Interval.................................. 300 Received Rate(Mbps)............................ 16.0 Transmitted Rate(Mbps)......................... 16.0 Received Error Rate............................ 0 Transmitted Error Rate......................... 0 Packets Received Per Second.................... 5405 Packets Transmitted Per Second................. 4731 Time Since Counters Last Cleared............... 9 day 10 hr 45 min 50 sec
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