Switching of frames is based upon the DMAC
The switch builds up a table that maps MAC addresses to switch ports for
knowing which ports the frames should
address contained in the frame.
go to (based upon the DMAC address in
me). This table contains both static and dynamic entries. The static entries
AC
es.
ing SMAC address has been seen after a configurable age time.
the fra
are configured by the network administrator if the administrator wants to do a
fixed mapping between the DMAC address and switch ports.
The frames also contain a MAC address (SMAC address), which shows the M
address of the equipment sending the frame. The SMAC address is used by the
switch to automatically update the MAC table with these dynamic MAC address
Dynamic entries are removed from the MAC table if no frame with the
correspond
Mirroring
For debugging network problems or monitoring network traffic, the switch syst
can be configured to mirror frames from multiple ports to a mirror port. (In this
context, mirroring a frame is the same as copying the frame.)
Both incoming (source) and outgoing (destination) frames can be mirrored to the
mirror port.
em
MLD
MLD is an acronym for
M
ulticast
L
istener
D
iscovery for IPv6. MLD is used by
IPv6 routers to discover multicast listeners on a directly attached link, much as
IGMP is used in IPv4. The protocol is embedded in ICMPv6 instead of using a
separate protocol.
MSTP
In 2002, the IEEE introduced an evolution of RSTP:
the
M
ultiple
S
panning
T
ree
P
rotocol. The MSTP protocol provides
spanning tree instances, while ensuring RSTP and STP
for multiple
compatibility. The
rd was originally defined by IEEE 802.1s, but was later incorporated in
standa
IEEE 802.1D-2005.
MVR
Multicast VLAN Registration (MVR) is a protocol for Layer 2 (IP)-networks that
enables multicast-traffic from a source VLAN to be shared with
subscriber-VLANs.
e
streams being sent in the core network, instead the stream(s) are
received on the MVR-VLAN and forwarded to the VLANs where hosts have
m (Wikipedia).
The main reason for using MVR is to save bandwidth by preventing duplicat
multicast
requested it/the
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