Enabling The Function Of Tracking A Downstream Neighbor - Huawei Quidway s3700 series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Multicast
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7.7.4 Enabling the Function of Tracking a Downstream Neighbor

When the Generation ID option in the Hello message received from an upstream neighbor
changes, it indicates that the status of the upstream neighbor changes. Therefore, you can
configure a PIM interface to deny the Hello messages without Generation ID options to obtain
the upstream neighbor status in real time.
Context
Do as follows on the PIM-SM switch:
Procedure
l
Issue 01 (2011-10-26)
On a shared network segment where all PIM switchs support the DR priority, the
interface with the highest priority acts as the DR. In the case of the same priority, the
interface with the largest IP address acts as the DR. If a minimum of one PIM
switch does not support the DR priority, the interface with the largest IP address acts
as the DR.
4. Run:
pim timer dr-switch-delay interval
The DR switchover delay is configured and the delay is specified.
When an interface changes from a DR to a non-DR, the original entries are valid till
the delay expires.
By default, once an interface changes from a DR to a non-DR, the original entries are
deleted immediately.
NOTE
The configuration involves the following cases:
l Global configuration: It is valid on all the interfaces.
l Configuration on the interface: The configuration on an interface takes precedence over the global
configuration. If the configuration on an interface is not done, the global configuration is used.
Global configuration
1. Run:
system-view
The system view is displayed.
2. Run:
pim
The PIM view is displayed.
3. Run:
hello-option neighbor-tracking
The function of tracking a downstream neighbor is enabled.
After this function is enabled, information about the downstream neighbor who has
sent a Join message and whose Join state does not times out is recorded.
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7 PIM-SM (IPv4) Configuration
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