Answer / jitendera kumar sinha

Spanning Tree Protocol Features
1 Bridge Protocol Data Unit (BPDU) Guard
2 Root Guard
3 EtherChannel Guard
4 Loop Guard

these 4 are major spaing tree feature

for understand that at first we must understand the spaing
tree term
root bridge-it is the bridge with the best bridge id.it is
the focal point of the network and which point is block and
which point is in forwading mode is are made from the root
bridge.
here comes bpdu gurd
slection cretirea of root bridge depend upon BPdu default
vale 2 sec.
each bpdu conatin
1 mac address
2 bridge priorty(32768 default)
3 bridge identy
so
BPDU contains management and control data information that
is used to determine the root bridge and establish the port
roles—for example: root, designated, or blocked port.

2 root port-.the root port is alway link directly conected
to root bridge.if there is more then one link then port
cost is detirmine if port cost is smae then bridge identy
comes in account
here comes root gurd
in a shairesd swiched envorment where there is many
conection betwen switches it is important to identify the
correct placement of the root bridge.With the Root Guard
feature, a Layer 2 interface is set as the designated port,
and if any device through this port becomes the root
bridge, the interface is placed into the blocked stae
this is all about root gurd

i will expalin two parametar tomorrow because i have some
work
thanks
jitendera kumar sinha

Answer / jitendera kumar sinha

here is 3rd answer
ehternet gurd is also known as port securty
let undersatnd what is that

UnderstandingHow PortSecurity Works:
You can use port security to block input to an Ethernet,
Fast Ethernet, or Gigabit Ethernet
port when the MAC address of the station attempting to
access the port is different from
any of the MAC addresses specified for that port.
Alternatively, you can use port security
to filter traffic destined to or received from a specific
host based on the host MAC
address.
When a secure port receives a packet, the source MAC
address of the packet is compared
to the list of secure source addresses that were manually
configured or autoconfigured
(learned) on the port. If a MAC address of a device
attached to the port differs from the
list of secure addresses, the port either shuts down
permanently (default mode), shuts
down for the time you have specified, or drops incoming
packets from the insecure host.
The port's behavior depends on how you configure it to
respond to a security violation.
If a security violation occurs, the Link LED for that port
turns orange, and a link-down
trap is sent to the Simple Network Management Protocol
(SNMP) manager. An SNMP
trap is not sent if you configure the port for restrictive
violation mode. A trap is sent only
if you configure the port to shut down during a security
violation

plz send me cisco contact no india?

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