110| Network Configuration Parameters AOS-W 6.5.3.x| User Guide
Optimizing VLAN Broadcast and Multicast Traffic
Broadcast and Multicast (BCMC) traffic from APs, remote APs, or distributions terminating on the same VLAN
floods all VLAN member ports. This causes critical bandwidth wastage, especially when the APs are connected
to an L3 cloud where the available bandwidth is limited or expensive. Suppressing the VLAN BCMC traffic to
prevent flooding can result in loss of client connectivity.
To effectively prevent flooding of BCMC traffic on all VLAN member ports, use the bcmc-optimization
parameter under the interface vlan command. This parameter ensures controlled flooding of BCMC traffic
without compromising the client connectivity. This option is disabled by default. You must enable this
parameter for the controlled flooding of BCMC traffic.
If you enable BCMC Optimization on uplink ports, the switch-generated Layer-2 packets will be dropped.
The bcmc-optimization parameter has the following exemptions:
n All DHCP traffic will continue to flood VLAN member ports even if you enable the bcmc-optimization
parameter.
n ARP broadcasts and VRRP (multicast) traffic will still be allowed.
You can configure BCMC optimization using the WebUI or CLI.
In the WebUI
1. Navigate to Configuration > Network > IP.
2. In the IP Interfaces tab, click Edit of the VLAN for configuring BCMC optimization.
3. Select the Enable BCMC check box to enable BCMC Optimization for the selected VLAN.
Figure 16 Enable BCMC Optimization
In the CLI
(host)(config) #interface vlan 1
(host)(config-subif)#bcmc-optimization
(host)(config-subif)#show interface vlan 1
Configuring Ports
Both Fast Ethernet and Gigabit Ethernet ports can be set to access or trunk mode. A port is in access mode
enabled by default and carries traffic only for the VLAN to which it is assigned. In trunk mode, a port can carry
traffic for multiple VLANs.
For a trunk port, specify whether the port will carry traffic for all VLANs configured on the switch or for specific
VLANs only. You can also specify the native VLAN for the port. A trunk port uses 802.1q tags to mark frames
for specific VLANs, However, frames on a native VLAN are not tagged.
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