Sunday, 6 July 2014

8 port Websmart Switch BC-3008WS

 8 port Websmart Switch BC-3008WS 

1) This model default IP address is 192.168.2.1  ID- admin Password - admin
2) This switch is not having reset button so you should have to note his changed IP address & password.



How switch broadcast storm protection works ?

Understanding Storm Control 

Storm control prevents traffic on a LAN from being disrupted by a broadcast, multicast, or unicast storm on a port. A LAN storm occurs when packets flood the LAN, creating excessive traffic and degrading network performance. Errors in the protocol-stack implementation, mistakes in network configuration, or users issuing a denial-of-service attack can cause a storm.

Storm control is configured for the switch as a whole but operates on a per-port basis. By default, storm control is disabled.

Storm control uses rising and falling thresholds to block and then restore the forwarding of broadcast, unicast, or multicast packets. You can also set the switch to shut down the port when the rising threshold is reached.

Storm control uses one of these methods to measure traffic activity:

•Bandwidth based

•Traffic rate at which packets are received (in packets per second) (available only on non-Long-Reach Ethernet [LRE] Catalyst 2950 switches)

The thresholds can either be expressed as a percentage of the total available bandwidth that can be used by the broadcast, multicast, or unicast traffic, or as the rate at which the interface receives multicast, broadcast, or unicast traffic.

When a switch uses the bandwidth-based method, the rising threshold is the percentage of total available bandwidth associated with multicast, broadcast, or unicast traffic before forwarding is blocked. The falling threshold is the percentage of total available bandwidth below which the switch resumes normal forwarding. In general, the higher the level, the less effective the protection against broadcast storms.

When a non-LRE Catalyst 2950 switch running Cisco IOS Release 12.1(14)EA1 or later uses traffic rates as the threshold values, the rising and falling thresholds are in packets per second. The rising threshold is the rate at which multicast, broadcast, and unicast traffic is received before forwarding is blocked. The falling threshold is the rate below which the switch resumes normal forwarding. In general, the higher the rate, the less effective the protection against broadcast storms.

Default Storm Control Configuration

By default, broadcast, multicast, and unicast storm control is disabled on the switch. The default action is to filter traffic and to not send an SNMP trap.

Configuring Storm Control and Threshold Levels

You configure storm control on a port and enter the threshold level that you want to be used for a particular type of traffic.

Storm control is supported on physical interfaces. You can also configure storm control on an EtherChannel, although you cannot configure storm control on the individual ports of that channel.

Reference of Cisco website

 
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