Zyxel OLT2412 [81/326] Mld port role

Zyxel OLT2412 [81/326] Mld port role
Chapter 8 IPv6
OLT2412 User’s Guide
81
MLD Port Role
A port on the OLT can be either a downstream port or upstream port in MLD. A downstream port
(DSP in the figure) connects to MLD hosts and acts as a multicast router to send MLD queries and
listen to the MLD host’s Report and Done messages. An upstream port (USP in the figure) connects
to a multicast router and works as a host to send Report or Done messages when receiving queries
from a multicast router.
MLD Snooping-Proxy
MLD snooping-proxy is a ZyXEL-proprietary feature. IPv6 MLD proxy allows only one upstream
interface on a switch, while MLD snooping-proxy supports more than one upstream port on a
switch. The upstream port in MLD snooping-proxy can report group changes to a connected
multicast router and forward MLD messages to other upstream ports. This helps especially when
you want to have a network that uses STP to provide backup links between switches and also
performs MLD snooping and proxy functions. MLD snooping-proxy, like MLD proxy, can minimize
MLD control messages and allow better network performance.
In MLD snooping-proxy, if one upstream port is learned via snooping, all other upstream ports on
the same device will be added to the same group. If one upstream port requests to leave a group,
all other upstream ports on the same device will also be removed from the group.
In the following MLD snooping-proxy example, all connected upstream ports (1 ~7) are treated as
one interface. The connection between ports 8 and 9 is blocked by STP to break the loop. If there is
DSP
USP
Proxy
Snooping

Содержание