Huawei quidway s7700 - Establishing the Configuration Task

12.10.1 Establishing the Configuration Task
After basic functions of IPv6 PIM-DM and MLD are configured, you can configure the PIM
silent function on the interface connected with the user host. This interface should be enabled
with IPv6 PIM-DM and MLD first.
Applicable Environment
At the access layer, the switch interface directly connected to hosts needs to be enabled with
PIM-IPv6. You can establish a PIM-IPv6 neighbor on the switch interface to process various
PIM packets. The configuration, however, has the security vulnerability. When a host
maliciously generates PIM-IPv6 Hello packets and sends the packets in a large quantity, the
switch may break down.
To avoid the preceding case, you can set the status of the switch interface to PIM silent. When
the interface is in the PIM-IPv6 silent state, the interface is prohibited from receiving and
forwarding any PIM-IPv6 packet. All PIM-IPv6 neighbors and PIM-IPv6 state machines on the
interface are deleted. The interface then acts as the static DR, which takes effect immediately.
At the same time, MLD on the interface is not affected.
PIM silent is applicable only to the switch interface directly connected to the host network
segment that is connected only to this switch.
CAUTION
If PIM-IPv6 silent is enabled on the interface connected to a switch, the PIM-IPv6 neighbor
cannot be established and a multicast fault may occur.
If the host network segment is connected to multiple switchs and PIM-IPv6 silent is enabled on
multiple switch interfaces, the interfaces become static DRs. Therefore, multiple DRs exist in
this network segment, and a multicast fault occurs.
Pre-configuration Tasks
Before configuring PIM-IPv6 silent, complete the following tasks:
l Configuring a unicast routing protocol to make the network layer reachable
l Configuring PIM-DM
l Configuring MLD
Data Preparation
To configure PIM-IPv6 silent, you need the following data.
No.
Data
1 Number of the switch interface connected to hosts
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 12 PIM-DM (IPv6) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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