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 NA = Not Applicable
LI = Listening LE = Learning
F = Forwarding
Port Name Control Dplx Media Link Speed Part Auto VlanID GVRP STP
-------------------------------------------------------------------------------
1 B1 E H 10Tx UP 10
2 B2 E H 10Tx DOWN 10
3 JohnDoe E H
4 JaneDoe E H
5 B5 E F 100Tx UP 100 No E
6 B6 E H 10Tx DOWN 10
ML810(device)##
show port=11
Configuration details of port 11
--------------------------------------------------
Port Name
Port Link State
Port Type : TP Port
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
9.3.4

Broadcast Storms

MULTILINK ML810 MANAGED EDGE SWITCH – INSTRUCTION MANUAL
D = Disable
F = Full Duplex
B = Blocking
No E 1
No E 1
10Tx DOWN 10 No E
10Tx DOWN 10 No E
1
No E 1
: JohnDoe
: DOWN
: Enable
: 1
: 10Mbps
: half-duplex
: Enable
: NO STP
: No GVRP
: None
: Enable
: Enable
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.
- -
- -
1 - -
1 - -
- -
- -
Note that the flow control and back pressure is
shown as enabled for the specific port. The global
show port
The back pressure and flow control parameters
are global – i.e., the same for all ports.
PORT SETUP
command does not provide this detail.
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