Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 600)

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Location Description

• ip igmp access-group igmpjoinfilR2G2

• no shutdown

Rate Limiting IGMP Join Requests

If you expect a burst of IGMP Joins, protect the IGMP process from overload by limiting that rate at which

new groups can be joined.

Hosts whose IGMP requests are denied will use the retry mechanism built-in to IGMP so that they’re

membership is delayed rather than permanently denied.

• Limit the rate at which new groups can be joined.

INTERFACE mode

ip igmp group-join-limit

To view the enable status of this feature, use the show ip igmp interface command from EXEC

Privilege mode.

Preventing a PIM Router from Forming an Adjacency

To prevent a router from participating in PIM (for example, to configure stub multicast routing), use the

following command.

• Prevent a router from participating in protocol independent multicast (PIM).

INTERFACE mode

ip pim neighbor-filter

Setting a Threshold for Switching to the SPT

The functionality to specify a threshold for switchover to the shortest path trees (SPTs) is available on

theS6000 platform. After a receiver receives traffic from the RP, PM-SM switches to SPT to forward

multicast traffic. Every multicast group has an RP and a unidirectional shared tree (group-specific shared

tree).

The SPT-Threshold is zero, which means that the last-hop designated router (DR) joins the shortest path

tree (SPT) to the source upon receiving the first multicast packet.

Initially, a single PIM-SM tree called a shared tree to distribute traffic. It is called shared because all traffic

for the group, regardless of the source, or the location of the source, must pass through the RP. The

shared tree is unidirectional; that is, all multicast traffic flows only from the RP to the receivers. Once a

receiver receives traffic from the RP, PM-SM switches to SPT to forward multicast traffic, which connects

the receiver directly to the source.

You can configure PIM to switch over to the SPT when the router receives multicast packets at or beyond

a specified rate.

Table 50. Configuring PIM to Switch Over to the SPT

IPv4 Configure PIM to switch over to the SPT when

the multicast packet rate is at or beyond a

ip pim spt-threshold

{value | infinity}

CONFIGURATION

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Multicast Features

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