User Manual UMN:CLI
V5808
435
9.2.8.3 Configuring Upstream Interface Mode
When a single downstream interface is specified with multiple upstream interfaces, V5808
supports two methods of IGMP proxy operation that are priority mode and load balancing
mode. You can choose the way how to handle multicast traffic going to upstream
interfaces. The priority mode is configured by default.
There are two modes for handling the multicast traffic toward upstream interfaces
- Priority mode: Each downstream interface joins one upstream interface of the highest
priority based on its credit, priority and vid.
- Load balancing mode: It distributes multicast packets across multiple links of upstream
interfaces with the largest credit value according to hash-threshold algorithm for IGMP
group.
Every upstream interface has a credit unit value (default :100) and a priority. The
upstream interfaces are specified a priority based on its credit value, the configured
priority value and vid. The highest upstream interface has larger credit, higher priority and
lower vid than other ones.
To specify the priority on an upstream interface, use the following command.
ip igmp proxy-service priority
<0-255>
Specifies the priority on an upstream interface
(default :0)
no ip igmp proxy-service
priority
Deletes the configured priority of upstream interface.
To choose the upstream interface mode for IGMP proxy operation, use the following
command.
ip igmp proxy-service multipath
grpip
Specifies load balancing mode for upstream interface
no ip igmp proxy-service
multipath grpip
Specifies priority mode for upstream interface.
9.2.8.4 IGMP-Proxy IF Flap Discredit
IGMP IF is IGMP Proxy-enabled upstream or downstream interface that is used for IGMP
proxy implementation.
IGMP IF flap discredit function is intended to apply a traffic flow penalty in IGMP interface
due to its link down-up (Flap). All of IGMP IFs have 100 credit values by default.
An IGMP IF loses the specified credit value in case the flapping happens on this interface.
Therefore, the forwarding path for the flow must be recalculated, causing low multicast
forwarding performance.
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