3com S7906E 安装指导

 

1-14 

Configurations performed in MLD view are globally effective, while configurations performed in interface 

view are effective on the current interface only. 

If the same function or parameter is configured in both PIM view and interface view, the configuration 

performed in interface view is given priority, regardless of the configuration sequence. 

 

Before adjusting MLD performance, complete the following tasks: 

z 

Configure any IPv6 unicast routing protocol so that all devices in the domain can be interoperable 

at the network layer. 

z 

Configure basic functions of MLD. 

In addition, prepare the following data: 

z 

Startup query interval 

z 

Startup query count 

z 

MLD query interval 

z 

MLD querier robustness variable  

z 

Maximum response delay of MLD general query messages 

z 

MLD last listener query interval  

z 

MLD other querier present interval 

MLD queries include multicast-address-specific queries and multicast-address-and-source-specific 

queries, and IPv6 multicast groups change dynamically, so a device cannot maintain the information for 

all IPv6 multicast sources and groups. Therefore, a router may receive IPv6 multicast packets 

addressed to IPv6 multicast groups that have no members on the local subnet. In this case, the 

Router-Alert option carried in the IPv6 multicast packets is useful for the router to make a decision 

whether to deliver the IPv6 multicast packets to the upper-layer protocol for processing. For details 

about the Router-Alert option, refer to RFC 2113. 

An MLD message is processed differently depending whether it carries the Router-Alert option in the 

IPv6 header: 

z 

By default, in consideration of compatibility, the device does not check the Router-Alert option, that 

is, it processes all received MLD messages. In this case, the device passes MLD messages to the 

upper layer protocol for processing, no matter whether the MLD messages carry the Router-Alert 

option or not. 

z 

To enhance the device performance, avoid unnecessary costs, and ensure the protocol security, 

you can configure the device to discard MLD messages without the Router-Alert option.  

Follow these steps to configure the Router-Alert option for MLD messages globally: 

Enter system view 

system-view 

— 

Enter MLD view 

mld 

—