Adjusting Parameters for Maintaining PIM-SM Neighbors
You can adjust the following parameters about PIM-SM neighbors, including:
l Interval for sending Hello messages
l Time period for the neighbor to hold the reachable state
l Whether to receive the Hello messages with Generation IDs
l Maximum delay in triggering the Hello messages
l Priority for DR election
l DR switching delay
l Neighbor filtering function: An interface sets up neighbor relationships with only the
addresses matching the filtering rules.
Configuring Control Parameters for Multicast Forwarding
You can adjust control parameters for multicast forwarding, including:
l Interval for sending Join messages
l Time period for the downstream interface to keep the forwarding state
l Time for overriding the prune action
l Filtering Join information in the Join/Prune messages
l Neighbor check function: checks whether the Join/Prune and Assert messages are sent to
or received from a PIM neighbor. If not, these messages are not processed.
Configuring Control Parameters for Assert
You can configure the period for retaining the Assert state of the switch interface.
Adjusting Control Parameters for SPT Switchover
You can adjust conditions of the SPT switchover and the interval for checking the forwarding
rate of multicast data.
PIM BFD
In the S7700, you can dynamically set up the BFD session to detect the status of the link between
PIM neighbors. Once a fault occurs on the link, BFD reports the fault to PIM.
PIM GR
The S7700 supports the PIM GR function on the switch with double MPUs. PIM GR ensures
normal multicast data forwarding during master-slave switchover of the switch.
Configuring PIM Silent
On the access layer, the switch interface directly connected to hosts needs to be enabled with
PIM. You can establish a PIM neighbor on the switch interface to process various PIM packets.
The configuration, however, has the security vulnerability. When a host maliciously generates
PIM Hello packets and sends the packets in large quantity, the switch may break down.
To prevent the preceding case, you can set the status of the switch interface to PIM silent. When
the interface is in the PIM silent state, the interface is prohibited from receiving and forwarding
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 6 PIM-SM (IPv4) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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