mac-address limitation

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This post underlines the mac-address limitation. For more information, please read further down this topic.


The customer has set a limit of 5000 addresses with the action of discard and at one side it's not working. On LF4.1, everything is working well, but on LF1.1 there has been seen mac-addresses pass the 5000 limit.


Both devices are CE6880 and the version is V200R005C10SPC800.


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<L.1.1>display mac-address summary

Summary information of slot 1:

Capacity of this slot : 98304

-----------------------------------

Static     :               0

Blackhole  :               0

Dyn-Local  :               0

Dyn-Remote :               0

Dyn-Trunk  :               1

OAM        :               0

Sticky     :               0

Security   :               0

Authen     :               0

Guest      :               0

Mux        :               0

Tunnel     :               2149

Snooping   :               0

Evn        :               5000

Ovsdb      :               0

In-used    :               7150

-----------------------------------


As we can see, the EVN learned that mac-addresses are limited to 5000 (which is OK), but we can see that the tunnel learned that mac-addresses are overpassing the limit.


The 2149 Tunnel addresses consists of the number of MAC address entries learned by Layer 2 tunnel.


The EVN mac-address entries are learned through the EVPN tunnel. EVN uses MP-BGP to transmit the MAC address entries between Layer 2 networks.


Solution


The difference between them is that the EVN / EVPN mac-address entries are coming from the forwarding plane and the 'tunnel' mac-address entries are coming from the control plane. These are the mac-addresses learned through the BGP, so that is why they are separate from the addresses learned through the EVPN tunnel.


The mac-address limit command is limiting the addresses through the forwarding plane. This is the reason for the mac-addresses through the control plane to overlap the 5000 limit; also, it would not be recommended to limit the addresses learned through the control plane.


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