Broadcast Storms - GE MultiLink ML810 Instruction Manual

CHAPTER 9: PORT MIRRORING AND SETUP
Back pressure and flow control (continued)
ML810(device)##
show port
Keys: E = Enable
H = Half Duplex
M = Multiple VLAN's
LI = Listening
F = Forwarding
Port Name Control
-------------------------------------------------------------------------------
1 B1 E
2 B2 E
3 JohnDoe E
4 JaneDoe E
5 B5 E
6 B6 E
ML810(device)##
show port=11
Configuration details of port 11
--------------------------------------------------
Port Name
Port Link State
Port Type
Port Admin State
Port VLAN ID
Port Speed
Port Duplex Mode
Port Auto-negotiation State
Port STP State
Port GVRP State
Port Priority Type
Port Security
Port Flow Control
Port Back Pressure
Port Link Loss Alert
9.3.4

Broadcast Storms

MULTILINK ML810 MANAGED EDGE SWITCH – INSTRUCTION MANUAL
D = Disable
F = Full Duplex
NA = Not Applicable
LE = Learning
B = Blocking
Dplx Media Link Speed
H 10Tx UP 10
H 10Tx DOWN 10
H 10Tx DOWN 10
H 10Tx DOWN 10
F 100Tx UP 100
H 10Tx DOWN 10
: JohnDoe
: DOWN
: TP Port
: Enable
: 1
: 10Mbps
: half-duplex
: Enable
: NO STP
: No GVRP
: None
: Enable
: Enable
: Enable
: Enabled
One of the best features of the MultiLink ML810 Managed Edge Switch is its ability to keep
broadcast storms from spreading throughout a network. Network storms (or broadcast
storms) are characterized by an excessive number of broadcast packets being sent over
the network. These storms can occur if network equipment is configured incorrectly.
Storms can reduce network performance and cause bridges, routers, workstations, servers
and PCs to slow down or even crash.
The MultiLink ML810 Managed Edge Switch is capable of detecting and limiting storms on
each port. A network administrator can also set the maximum rate of broadcast packets
(frames) that are permitted from a particular interface. If the maximum number is
exceeded, a storm condition is declared. Once it is determined that a storm is occurring on
an interface, any additional broadcast packets received on that interface will be dropped
until the storm is determined to be over. The storm is determined to be over when a one-
second period elapses with no broadcast packets received.
Part Auto VlanID GVRP
No E 1 -
No E 1 -
No E 1 -
No E 1 -
No E 1 -
No E 1 -
Note that the flow control and back pressure is
shown as enabled for the specific port. The global
command does not provide this detail.
show port
The back pressure and flow control parameters
are global – i.e., the same for all ports.
PORT MIRRORING AND SETUP
STP
-
-
-
-
-
-
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