16
Virtual Circuit:
Select Enable to activate the current PVC configuration. The current
PVC is displayed at the top of the page in parenthesis. Default is Enabled for PVC0 and
Disabled for PVC1-PVC7.
Bridge:
Enable to connect the LAN to the WAN (bridge the two connections). This is
available in Bridge Mode only (see Table 5-2). Default is Disabled.
IGMP:
IGMP (Internet Group Management Protocol) relay/proxy specification and envi-
ronment, default is Disabled. IGMP is available in all modes and all encapsulations.
Support IGMP proxy/relay function for Router, based on the following requirement and
cases:
l
On CO side, there must be at least one IGMP querier (router) present. IGMP que-
rier will send IGMP query packet. The Router is responsible to relay these IGMP
queries to Ethernet.
l
End-user multicast application device sends IGMP report while receiving IGMP
query or being activated by the user. The Router should be responsible to proxy
(that is, change source IP to Router
’
s WAN IP) the IGMP report to ADSL WAN
side, including all PVCs. The same case is for IGMP leave packet.
l
Not necessary to relay multicast routing between two ADSL PVCs or two inter-
faces in LAN side.
l
Special purpose multicast packet (such as RIP 2 packet) should run without In-
terference.
Table 5-2. Packet Process
Rx Entity
Packet Class
TTL
Action
IGMP query
1
Relay to Ethernet
IGMP report
1
Ignore
IGMP leave
1
Ignore
ADSL
General Multicast IP
-
Relay it to Ethernet
IGMP query
1
Ignore
IGMP report
1
Relay to all ADSL PVCs
IGMP leave
1
Relay to all ADSL PVCs
Ethernet
General Multicast IP
-
Ignore
Before the IGMP mode is enabled; please go to the Miscella-
neous Configuration page to enable the IGMP proxy. Other-
wise, the IGMP selection will not be valid.
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