常用组播路由协议配置方法
IGMP协议配置
IGMP基本设置
配置路由器加入到一个组播组：
Router(config-if)# ip igmp join-group 225.2.2.2
控制某个接口下主机能够加入的组播组
ip igmp access-group access-list
【例如】
Router(config)# access-list 1 225.2.2.2 .0
Router(config)# interface ethernet 0
Router(config-if)ip igmp access-group 1
ACL可以同时对组播报文的源和目的地址控制，达到过滤组播源，同时也能过滤特定接收主机的作用，例如：
Deny all state for a group G
deny igmp any host G
permit igmp any any
Deny all state for a source S
deny igmp host S any
permit igmp any any
Permit all state for a group G
permit igmp any host G
Permit all state for a source S
permit igmp host S any
Filter a particular source for a group G
deny igmp host S host G
permit igmp any host G
IGMP版本切换
Router(config-if)# ip igmp version{2|3}
IGMP查询间隔时间：默认60s
Router(config-if)# ip igmp query-interval 120 IGMP查询超时时间：默认为2倍的查询间隔时间Router(config-if)# ip igmp query-timeout 30
IGMP查询最大响应时间：默认为10s
Router(config-if)# ip igmp query-max-response-time 8
IGMP Proxy
如图2，当C收到组播请求后，发送一条PIM-SM join的消息给B，Ｂ发送一个IGMP的请求到A，A通过一条单播链路将数据传送到
B，这个过程就需要一个IGMP的代理，配置如下：
图2
【例如】
Router A Configuration
ip address .1 255.255.255.0
ip pim dense-mode
!
interface ethernet 1
ip address .1 255.255.255.0
ip pim dense-mode
ip igmp unidirectional link
!
interface ethernet 2
ip address .1 255.255.255.0
Router B Configuration
ip pim rp-address .1 5
access-list 5 permit 239.0.0.0 0.255.255.255.255 !
ip address .1 255.255.255.0
ip pim dense-mode
ip igmp helper-address udl ethernet 0 ip igmp proxy-service
!
interface ethernet 0
ip address .2 255.255.255.0
ip pim dense-mode
ip igmp unidirectional link
!
interface ethernet 1
ip address .1 255.255.255.0
ip pim sparse-mode
ip igmp mroute-proxy loopback 0
!
ip address .1 255.255.255.0
Router C Configuration
ip pim rp-address .1 5
access-list 5 permit 239.0.0.0 0.255.255.255 !
interface ethernet 0
ip address .1 255.255.255.0
ip pim sparse-mode
!
interface ethernet 1
ip address .1 255.255.255.0
ip pim sparse-mode
IGMP Snooping
开启IGMP轮询
Router(config)#ip igmp snooping
IGMP Snooping调整
在单个vlanxx启用Snooping：
ip igmp snooping vlan
IGMP Snooping快速离开
ip igmp snooping vlan immediate-leave
The following example shows how to enable IGMP Immediate-Leave processing on VLAN 1:
Router(config)# ip igmp snooping vlan 1 immediate-leave IGMP Snooping参考多播路由
ip igmp snooping vlan mrouter
To add a multicast router port and to configure the multicast router learning method, use the ip
igmp snooping vlan mrouter command in global
configuration mode.
ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn pim-dvmrp}