APC IP DSLAM Betriebsanweisung PDF herunterladen (Seite 433)

100

101

425

Port Index : 6

Port Igmp Snoop Status : Enable Leave Mode :

Normal

IGMP PacketsPrio:2MaxGroupAllowed:2'

Querier Status : Enable McastVlan Status :

Enable

No McastVlan Match Action : Learn

Output field

Field Description

Port Index

This parameter specifies a bridge port for which

IGMP Snooping needs to be enabled or

disabled.

Port Igmp Snoop

Status

This parameter specifies whether IGMP

Snooping is to be enabled on the port.

Leave Mode

This parameter specifies the Igmp Snooping

Leave message processing mode for the port. If

the mode is set to 'Normal', the Leave message

is forwarded to the Querier. Then, based on the

Query received from Querier, the Leave

processing is triggered. If the mode is set to

'Fast', the port is immediately deleted from that

multicast group on Leave message reception

and then the Leave message is forwarded. The

mode should be set to 'Fast' for a port only if

there is one host behind the port. This is

because if there are multiple hosts behind the

port then it will lead to traffic disruption for other

hosts who might still be listening to that multicast

group. If the mode is set to 'FastNormal', the

Leave message is forwarded and the Leave

processing is triggered immediately without

waiting for any trigger from the Querier. The

'FastNormal' mode, thus, saves the delay (equal

to the time taken for Leave message to reach

router and Querier processing time for it and the

time taken for Query to reach IGMP Snoop

module) in Leave processing.

IGMP PacketsPrio'

This parameter specifies the Egress Priority to

be set in case the Ethernet frames carrying

IGMP packets sent over this port need to be

tagged by the control plane. In case the frame

came tagged, priority that came in the tagged

frame will not be changed. The configured

priority will also be used for choice of traffic

class/Queue on outgoing interface whether the

frame is tagged . In case the bridge port is over

an Aggregated ATM VC, this will also be used to

identify the VC, on which the packet is to be

sent. There is an additional support of invalid

value for egress priority in IGMP port info to

indicate that the priority is not to be forced on

egress frame for this port.

MaxGroupAllowed

This parameter controls the no. of simultaneous

channels that can be received by this port

Querier Status

This parameter controls whether a port can

become querier

McastVlan Status

This parameter controls the status of Multicast

Vlan option on a port

No McastVlan Match

Action

This parameter specifies the action to be taken

when multicast vlan can not be determined for a

port where multicast vlan option is enabled

Possible action values will be :Drop,

1 2 ... 428 429 430 431 432 433 434 435 436 437 438 ... 602 603

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