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3-6 AR400 Series Router Software Reference

Software Release 2.6.6

C613-03079-00 REV A

Three sets of options are allowed for packet storm protection:

■ broadcast limit (BCLIMIT)

■ broadcast limit and multicast limit (BCLIMIT and MCLIMIT)

■ broadcast limit, multicast limit, and destination lookup failure limit

(BCLIMIT, MCLIMIT, and DLFLIMIT)

The limit specified for each option, i.e the number of kilobits per second

(Kbps), must be the same for all modes of storm protection selected. The limit

is set to the most recent limit specified. For example:

SET SWI PORT=1 BCLIMIT=256 MCLIMIT=256 DLFLIMIT=256

Packet storm protection limits are set on a per port basis.

To display the packet storm protection settings, use the command:

SHOW SWITCH PORT[={port-list|ALL}]

Virtual Local Area Networks (VLANs)

A Virtual LAN (VLAN) is a logical, software-defined subnetwork. It allows

similar devices on the network to be grouped together into one broadcast

domain, irrespective of their physical position in the network. Multiple VLANs

can be used to group workstations, servers, and other network equipment

connected to the router, according to similar data and security requirements.

Decoupling logical broadcast domains from the physical wiring topology

offers several advantages, including the ability to:

■ Move devices and people with minimal, or no, reconfiguration

■ Change a device’s broadcast domain and access to resources without

physically moving the device, by software reconfiguration or by moving its

cable from one switch port to another

■ Isolate parts of the network from other parts, by placing them in different

VLANs

■ Share servers and other network resources without losing data isolation or

security

■ Direct broadcast traffic to only those devices that need to receive it in order

to reduce traffic across the network

■ Connect 802.1q-compatible devices together through one port on each

device

Devices that are members of the same VLAN only exchange data with each

other through the router’s switching capabilities. To exchange data between

devices in separate VLANs, the router’s routing capabilities are used. The

router passes VLAN status information, indicating whether a VLAN is up or

down, to the Internet Protocol (IP) module. IP uses this information to

determine route availability.

The router has a maximum of 64 VLANs ranging from a VLAN identifier (VID)

of 1 to 4094.

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