Planet Networking & Communication IGSW-24040T, Руководство пользователя, Страница: 510 / 521

User’s Manual of IGSW-24040T
LLDP-MED
LLDP-MED is an extendsion of IEEE 802.1ab and is defined by the telecommunication industry association
(TIA-1057).
LOC
LOC is an acronym for
L
oss
O
f
C
onnectivity and is detected by a MEP and is indicating lost connectivity in the network.
Can be used as switch criteria by EPS
M
MAC Table
Switching of frames is based upon the DMAC address contained in the frame. The switch builds up a table that maps
MAC addresses to switch ports for knowing which ports the frames should go to (based upon the DMAC address in the
frame). This table contains both static and dynamic entries. The static entries 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 MAC 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
addresses. Dynamic entries are removed from the MAC table if there is not frame with the corresponding SMAC
address have been seen after a configurable age time.
MEP
MEP is an acronym for
M
aintenance
E
ntity
E
ndpoint and is an endpoint in a Maintenance Entity Group (ITU-T Y.1731).
MD5
MD5 is an acronym for
M
essage-
D
igest algorithm
5
. MD5 is a message digest algorithm, used cryptographic hash
function with a 128-bit hash value. It was designed by Ron Rivest in 1991. MD5 is officially defined in RFC 1321 - The
MD5 Message-Digest Algorithm.
Mirroring
For debugging network problems or monitoring network traffic, the switch system 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.
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