Ericsson ECN330, User Manual

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Configuring the ECN330-switch
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1553-KDU 137 365 Uen D 2006-06-16
Command Attributes
• VLAN (Interface) – VLAN interface bound to a primary IP address.
(Range: 1-4094)
• IGMP Protocol Status (Admin Status) – Enables IGMP on a VLAN
interface. (Default: Disabled)
• Last Member Query Interval – A multicast client sends an IGMP leave
message when it leaves a group. The router then checks to see if this
was the last host in the group by sending an IGMP query and starting a
timer based on this command. If no reports are received before the
timer expires, the group is deleted. (Range: 0-25 seconds; Default: 1
second)
• This value may be tuned to modify the leave latency of the network.
A reduced value results in reduced time to detect the loss of the last
member of a group.
• Max Query Response Time – Configures the maximum response time
advertised in IGMP queries. (Range: 0-25 seconds; Default: 10
seconds)
• The ECN330-switch must be using IGMPv2 for this command to
take effect.
• This command defines how long any responder (that is, client or
router) still in the group has to respond to a query message before
the router deletes the group.
• By varying the Maximum Query Response Time, the burstiness of
IGMP messages passed on the subnet can be tuned; where larger
values make the traffic less bursty, as host responses are spread
out over a larger interval.
• The number of seconds represented by the maximum response
interval must be less than the Query Interval.
• Query Interval – Configures the frequency at which host query
messages are sent. (Range: 1-255; Default: 125 seconds)
• Multicast routers send host query messages to determine the
interfaces that are connected to downstream hosts requesting a
specific multicast service. Only the designated multicast router for a
subnet sends host query messages, which are addressed to the
multicast address 224.0.0.1.