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Cisco Employee

Broadcast on a LAn

Hi All,

what is the recommended percentage of broadcast out of the total traffic in a LAN?

Any design document on this on the CCO?

Thanks

Matteo

1 REPLY
Gold

Re: Broadcast on a LAn

Cisco Press's book "Top-Down Detwork Design" (page 103) recommends the following maximum sizes for broadcast domains (VLANs), based on desktop protocols in use:

IP - 500 workstations (reduce to 200 if users are running multimedia apps, have high-bandwidth plus low-delay requirements, and/or high level of broadcast or multicast packets)

NetWare (IPX) - 300 workstations

AppleTalk - 200 workstations

NetBIOS - 200 workstations

Mixed (any of the above) - 200 workstations

Per the same book (p.102), if more than 20% of the network traffic is broadcasts or multicasts, then the network needs to be segmented.

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