Optimizing VLAN Broadcast and Multicast Traffic

广播,Multicast traffic from APs,remote APsRemote APs extend corporate network to the users working from home or at temporary work sites. Remote APs are deplyed at branch office sites and are connected to the central network on a WAN link., or distributions terminating on the sameVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.floods allVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or 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 theVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.broadcast-multicast traffic to prevent flooding can result in loss of client connectivity.

To effectively prevent flooding of broadcast-multicast traffic on allVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.member ports, use thebcmc-optimizationparameter under theinterface vlancommand. This parameter ensures controlled flooding of broadcast-multicast traffic without compromising the client connectivity. This option is disabled by default. You must enable this parameter for the controlled flooding of broadcast-multicast traffic.

If you enable broadcast-multicast optimization on uplink ports, themanaged device-generated Layer-2 packets will be dropped.

Thebcmc-optimizationparameter has the following exemptions:

AllDHCPDynamic Host Configuration Protocol. A network protocol that enables a server to automatically assign an IP address to an IP-enabled device from a defined range of numbers configured for a given network.traffic will continue to floodVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.member ports even if you enable thebcmc-optimizationparameter.

ARPAddress Resolution Protocol. ARP is used for mapping IP network address to the hardware MAC address of a device.broadcasts andVRRPVirtual Router Redundancy Protocol. VRRP is an election protocol that dynamically assigns responsibility for a virtual router to one of the VRRP routers on a LAN.(multicast) traffic will still be allowed.

The following procedure configures broadcast-multicast optimization:

1.In theMobility Masternode hierarchy, navigate toConfiguration > Interfaces > VLANs.

2.Select aVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.from theVLANstable.

3.UnderVlan Ids, select theVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.ID number.

4.Navigate to theIPv4tab for the selectedVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN.ID.

5.ClickOther Optionto expand it.

6.Set theBCMC optimizationtoEnabledfor the selectedVLANVirtual Local Area Network. In computer networking, a single Layer 2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them through one or more routers; such a domain is referred to as a Virtual Local Area Network, Virtual LAN, or VLAN..

7.ClickSubmit.

8.ClickPending Changes.

9.In thePending Changeswindow, select the check box and clickDeploy changes.

The followingCLICommand-Line Interface. A console interface with a command line shell that allows users to execute text input as commands and convert these commands to appropriate functions.command configures broadcast-multicast optimization:

(host) [mynode] (config) #interface vlan

(host) [mynode] (config-subif)#bcmc-optimization

(host) [mynode] (config-subif)#show interface vlan