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组播配置举例组播配置举例关键词:IGMP、IGMPSnooping、组播VLAN、PIM、MSDP、MBGP摘

要:本文主要介绍组播功能在具体组网中的应用配置,包括以下两种典型组网应用:域内的二、三层组播应用情况,以及域间的三层组播应用情况。缩略语:缩略语英文全名中文解释ASAutonomousSystem自治系统ASMAny-SourceMulticast任意信源组播BGPBorderGatewayProtocol边界网关协议BSRBootStrapRouter自举路由器C-BSRCandidate-BSR候选BSRC-RPCandidate-RP候选RPDRDesignatedRouter指定路由器IGMPInternetGroupManagementProtocol互联网组管理协议MBGPMulticastBorderGatewayProtocol组播边界网关协议MP-BGPMultiProtocolBorderGatewayProtocol多协议边界网关协议MSDPMulticastSourceDiscoveryProtocol组播源发现协议OSPFOpenShortestPathFirst开放最短路径优先PIM-DMProtocolIndependentMulticast-DenseMode协议无关组播—密集模式PIM-SMProtocolIndependentMulticast-SparseMode协议无关组播—稀疏模式RPRendezvousPoint汇集点RPFReversePathForwarding逆向路径转发RPTRendezvousPointTree共享树SPTShortestPathTree最短路径树SSMSource-SpecificMulticast指定信源组播

录1特性简介2应用场合3域内二、三层组播配置举例3.1组网需求3.2配置思路3.3配置步骤3.3.1RouterA的配置3.3.2RouterB的配置3.3.3RouterC的配置3.3.4RouterD的配置3.3.5SwitchA的配置3.3.6SwitchB的配置3.3.7SwitchC的配置3.4验证结果4域间三层组播配置举例4.1组网需求4.2配置思路4.3配置步骤4.3.1RouterA的配置4.3.2RouterB的配置4.3.3RouterC的配置4.3.4RouterD的配置4.3.5RouterE的配置4.3.6RouterF的配置4.4验证结果5相关资料5.1相关协议和标准

1

特性简介组播是指在IP网络中将数据包以尽力传送的形式发送到某个确定的节点集合,其基本思想是:源主机只发送一份数据,其目的地址为组播组地址;组播组中的所有接收者都可收到同样的数据拷贝,并且只有组播组内的主机可以接收该数据,而其它主机则不能收到。作为一种与单播和广播并列的通信方式,组播技术能够有效地解决单点发送、多点接收的问题,从而实现了IP网络中点到多点的高效数据传送,能够节约大量网络带宽、降低网络负载。以下是对各常用组播协议的简单介绍:1.IGMPIGMP是TCP/IP协议族中负责IP组播组成员管理的协议,用来在IP主机和与其直接相邻的组播路由器之间建立、维护组播组成员关系。IGMP运行于主机和与主机直连的路由器之间,其实现的功能是双向的:一方面,主机通过IGMP通知路由器希望接收某个特定组播组的信息;另一方面,路由器通过IGMP周期性地查询局域网内的组播组成员是否处于活动状态,实现所连网段组成员关系的收集与维护。2.IGMPSnoopingIGMPSnooping是运行在二层设备上的组播约束机制,用于管理和控制组播组。运行IGMPSnooping的二层设备通过对收到的IGMP报文进行分析,为二层端口和组播MAC地址建立起映射关系,并根据这个映射关系转发组播数据。3.组播VLAN在传统的组播点播方式下,当连接在二层设备上、属于不同VLAN的用户分别进行组播点播时,三层组播设备需要向该二层设备的每个VLAN分别发送一份组播数据;而当二层设备运行了组播VLAN之后,三层组播设备只需向该二层设备的组播VLAN发送一份组播数据即可,从而既避免了带宽的浪费,也减轻了三层组播设备的负担。4.PIMPIM是ProtocolIndependentMulticast(协议无关组播)的简称,表示可以利用静态路由或者任意单播路由协议(包括RIP、OSPF、IS-IS、BGP等)所生成的单播路由表为IP组播提供路由。组播路由与所采用的单播路由协议无关,只要能够通过单播路由协议产生相应的组播路由表项即可。PIM借助单播路由表对组播报文进行RPF检查,以实现对组播数据的转发。根据转发机制的不同,PIM分为以下两种模式:

PIM-DM:属于密集模式的组播路由协议,使用“推(Push)模式”传送组播数据,通常适用于组播组成员相对比较密集的小型网络;

PIM-SM:属于稀疏模式的组播路由协议,使用“拉(Pull)模式”传送组播数据,通常适用于组播组成员分布相对分散、范围较广的大中型网络。5.MSDP在基本的PIM-SM模式下,组播源只向本PIM-SM域内的RP注册,且各域的组播源信息是相互隔离的,因此RP仅知道本域内的组播源信息,只能在本域内建立组播分发树。如果能够有一种机制,使不同域内的RP共享其组播源信息,就可以实现组播数据的跨域传输。MSDP就是为了解决多个PIM-SM域之间的互连而开发的一种域间组播解决方案,用来发现其它PIM-SM域内的组播源信息。它通过在各域的RP之间建立MSDP对等体关系,使这些RP可以共享各域内的组播源信息。尽管MSDP是为域间组播开发的,但它在PIM-SM域内还有着一项特殊的应用——AnycastRP(任播RP)。AnycastRP是指在同一PIM-SM域内通过设置两个或多个具有相同地址的RP,并在这些RP之间建立MSDP对等体关系,以实现域内各RP之间的负载分担和冗余备份。6.MBGP当组播源与接收者分布在不同的AS中时,需要跨AS建立组播转发树。应用MP-BGP协议就可以专门跨AS传输组播路由信息。BGP-4协议仅应用于单播,MP-BGP是对BGP的多协议扩展,它在现有BGP-4的基础上增强了功能,使BGP能够为包括组播路由协议在内的多种路由协议提供路由信息:

MP-BGP可以同时为单播和组播维护路由信息,将它们储存在不同的路由表中,保持单播和组播之间路由信息相互隔离;

作为BGP的多协议扩展,MP-BGP可以同时支持单播和组播模式,为两种模式构建不同的网络拓扑结构;

原BGP-4所支持的单播路由策略和配置方法大部分都可应用于组播模式,从而可以根据路由策略为单播和组播维护不同的路由。MP-BGP在组播上的应用简称为MBGP(组播BGP)。2

应用场合利用组播技术可以方便地提供一些新的增值业务,包括在线直播、网络电视、网络电台、远程教育、远程医疗、视频会议等对带宽和数据交互的实时性要求较高的信息服务。如图1所示,是各常用组播协议在网络中的应用场合示意图。图1

常用组播协议应用场合示意图3

域内二、三层组播配置举例3.1

组网需求(1)

需求分析

某企业的核心网内部通过OSPF协议互连,并拥有两个视频源:Source1通过组播组G1()传送节目1,Source2则通过组播组G2()传送节目2。要求在核心网通过使用PIM-SM协议实现视频流的组播分发,并利用AnycastRP功能实现双RP负载分担和冗余备份,提高网络可靠性。

该企业的接入网按部门划分为多个VLAN以方便管理,各部门内的点播者(Receiver)有不同的点播需求:HostA和HostC点播节目1,HostE点播节目2。要求在接入网通过IGMP、IGMPSnooping和组播VLAN的结合使用,使视频流按需送达各点播者,提高带宽利用率。(2)

网络规划设备接口IP地址设备接口IP地址Source1-00/24Source2-00/24RouterAEth1//24RouterCEth1//24

S2/1/24

S2/1/24

S2/2/24

Loop0/32RouterBS2/1/24

Loop/32

S2/2/24RouterDEth1//24

Loop0/32

Eth1//24

Loop/32

S2/1/24图2

域内二、三层组播配置组网图3.2

配置思路(1)

配置核心网:

在所有路由器上都配置OSPF协议,并在其各接口上使能PIM-SM协议;

为了避免物理接口down而导致的网络振荡,将RouterB和RouterC各自的Loopback1接口配置为C-BSR、Loopback0接口配置为C-RP;

在RouterB和RouterC各自的Loopback1接口之间建立MSDP对等体关系,以实现AnycastRP功能。(2)

配置接入网:

在RouterC和RouterD的主机侧接口上使能IGMP协议;

在所有交换机上划分VLAN,并在VLAN内使能IGMPSnooping,同时使能丢弃未知组播数据报文功能,以防止交换机在没有二层组播转发表项时将组播数据在VLAN内广播;

在SwitchA上配置基于子VLAN的组播VLAN,以避免RouterC将不同VLAN内点播的相同组播数据重复发至SwitchA。3.3

配置步骤

说明:以下配置均是在实验室环境下进行的配置和验证,配置前设备的所有参数均采用出厂时的缺省配置。如果您已经对设备进行了配置,为了保证配置效果,请确认现有配置和以下配置不冲突。本文档不严格与具体软、硬件版本对应。

3.3.1

RouterA的配置1.配置步骤#配置OSPF协议。<RouterA>system-view[RouterA]ospf1[RouterA-ospf-1]area[RouterA-ospf-1-area-]network55[RouterA-ospf-1-area-]network55[RouterA-ospf-1-area-]network55[RouterA-ospf-1-area-]quit[RouterA-ospf-1]quit#使能IP组播路由,并在各接口上使能PIM-SM。[RouterA]multicastrouting-enable[RouterA]interfaceethernet1/1[RouterA-Ethernet1/1]pimsm[RouterA-Ethernet1/1]quit[RouterA]interfaceserial2/1[RouterA-Serial2/1]pimsm[RouterA-Serial2/1]quit[RouterA]interfaceserial2/2[RouterA-Serial2/2]pimsm[RouterA-Serial2/2]return2.配置文件<RouterA>displaycurrent-configuration#

sysnameRouterA#

multicastrouting-enable#interfaceEthernet1/1

portlink-moderoute

ipaddress

pimsm#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#interfaceSerial2/2

link-protocolppp

ipaddress

pimsm#ospf1

area

network55

network55

network55#return3.3.2

RouterB的配置1.配置步骤#配置OSPF协议。<RouterB>system-view[RouterB]ospf1[RouterB-ospf-1]area[RouterB-ospf-1-area-]network[RouterB-ospf-1-area-]network[RouterB-ospf-1-area-]network55[RouterB-ospf-1-area-]network55[RouterB-ospf-1-area-]quit[RouterB-ospf-1]quit#使能IP组播路由,并在各接口上使能PIM-SM。[RouterB]multicastrouting-enable[RouterB]interfaceserial2/1[RouterB-Serial2/1]pimsm[RouterB-Serial2/1]quit[RouterB]interfaceserial2/2[RouterB-Serial2/2]pimsm[RouterB-Serial2/2]quit[RouterB]interfaceloopback0[RouterB-LoopBack0]pimsm[RouterB-LoopBack0]quit[RouterB]interfaceloopback1[RouterB-LoopBack1]pimsm[RouterB-LoopBack1]quit#将Loopback1接口配置为C-BSR,将Loopback0接口配置为C-RP。[RouterB]pim[RouterB-pim]c-bsrloopback1[RouterB-pim]c-rploopback0[RouterB-pim]quit#配置MSDP对等体。[RouterB]msdp[RouterB-msdp]originating-rploopback1[RouterB-msdp]peerconnect-interfaceloopback1[RouterB-msdp]return2.配置文件<RouterB>displaycurrent-configuration#

sysnameRouterB#

multicastrouting-enable#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#interfaceSerial2/2

link-protocolppp

ipaddress

pimsm#interfaceLoopBack0

ipaddress55

pimsm#interfaceLoopBack1

ipaddress55

pimsm#ospf1

area

network

network

network55

network55#pim

c-bsrLoopBack1

c-rpLoopBack0#msdp

originating-rpLoopBack1

peerconnect-interfaceLoopBack1#return3.3.3

RouterC的配置1.配置步骤#配置OSPF协议。<RouterC>system-view[RouterC]ospf1[RouterC-ospf-1]area[RouterC-ospf-1-area-]network[RouterC-ospf-1-area-]network[RouterC-ospf-1-area-]network55[RouterC-ospf-1-area-]network55[RouterC-ospf-1-area-]quit[RouterC-ospf-1]quit#使能IP组播路由,在各接口上使能PIM-SM,并在主机侧接口上使能IGMP。[RouterC]multicastrouting-enable[RouterC]interfaceethernet1/1[RouterC-Ethernet1/1]pimsm[RouterC-Ethernet1/1]igmpenable[RouterC-Ethernet1/1]quit[RouterC]interfaceserial2/1[RouterC-Serial2/1]pimsm[RouterC-Serial2/1]quit[RouterC]interfaceloopback0[RouterC-LoopBack0]pimsm[RouterC-LoopBack0]quit[RouterC]interfaceloopback1[RouterC-LoopBack1]pimsm[RouterC-LoopBack1]quit#将Loopback1接口配置为C-BSR,将Loopback0接口配置为C-RP。[RouterC]pim[RouterC-pim]c-bsrloopback1[RouterC-pim]c-rploopback0[RouterC-pim]quit#配置MSDP对等体。[RouterC]msdp[RouterC-msdp]originating-rploopback1[RouterC-msdp]peerconnect-interfaceloopback1[RouterC-msdp]return2.配置文件<RouterC>displaycurrent-configuration#

sysnameRouterC#

multicastrouting-enable#interfaceEthernet1/1

portlink-moderoute

ipaddress

igmpenable

pimsm#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#interfaceLoopBack0

ipaddress55

pimsm#interfaceLoopBack1

ipaddress55

pimsm#ospf1

area

network

network

network55

network55#pim

c-bsrLoopBack1

c-rpLoopBack0#msdp

originating-rpLoopBack1

peerconnect-interfaceLoopBack1#return3.3.4

RouterD的配置1.配置步骤#配置OSPF协议。<RouterD>system-view[RouterD]ospf1[RouterD-ospf-1]area[RouterD-ospf-1-area-]network55[RouterD-ospf-1-area-]network55[RouterD-ospf-1-area-]network55[RouterD-ospf-1-area-]quit[RouterD-ospf-1]quit#使能IP组播路由,在各接口上使能PIM-SM,并在主机侧接口上使能IGMP。[RouterD]multicastrouting-enable[RouterD]interfaceethernet1/1[RouterD-Ethernet1/1]pimsm[RouterD-Ethernet1/1]quit[RouterD]interfaceethernet1/2[RouterD-Ethernet1/2]pimsm[RouterD-Ethernet1/2]igmpenable[RouterD-Ethernet1/2]quit[RouterD]interfaceserial2/1[RouterD-Serial2/1]pimsm[RouterD-Serial2/1]quit2.配置文件<RouterD>displaycurrent-configuration#

sysnameRouterD#

multicastrouting-enable#interfaceEthernet1/1

portlink-moderoute

ipaddress

pimsm#interfaceEthernet1/2

portlink-moderoute

ipaddress

igmpenable

pimsm#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#ospf1

area

network55

network55

network55#return3.3.5

SwitchA的配置1.配置步骤#全局使能IGMPSnooping。<SwitchA>system-view[SwitchA]igmp-snooping[SwitchA-igmp-snooping]quit#创建VLAN10,并把端口Ethernet1/2到Ethernet1/3添加到该VLAN中。[SwitchA]vlan10[SwitchA-vlan10]portethernet1/2toethernet1/3[SwitchA-vlan10]quit#创建VLAN20,并把端口Ethernet1/4添加到该VLAN中。[SwitchA]vlan20[SwitchA-vlan20]portethernet1/4[SwitchA-vlan20]quit#创建VLAN5,把端口Ethernet1/1添加到该VLAN中;在该VLAN内使能IGMPSnooping,并使能丢弃未知组播数据报文功能。[SwitchA]vlan5[SwitchA-vlan5]portethernet1/1[SwitchA-vlan5]igmp-snoopingenable[SwitchA-vlan5]igmp-snoopingdrop-unknown[SwitchA-vlan5]quit#配置VLAN5为组播VLAN,并把VLAN10和VLAN20都配置为该组播VLAN的子VLAN。[SwitchA]multicast-vlan5[SwitchA-mvlan-5]subvlan1020[SwitchA-mvlan-5]return2.配置文件<SwitchA>displaycurrent-configuration#

sysnameSwitchA#igmp-snooping#vlan5

igmp-snoopingenable

igmp-snoopingdrop-unknown#vlan10#vlan20#multicast-vlan5

subvlan1020#interfaceEthernet1/1

portaccessvlan5#interfaceEthernet1/2

portaccessvlan10#interfaceEthernet1/3

portaccessvlan10#interfaceEthernet1/4

portaccessvlan20#return3.3.6

SwitchB的配置1.配置步骤#全局使能IGMPSnooping。<SwitchB>system-view[SwitchB]igmp-snooping[SwitchB-igmp-snooping]quit#创建VLAN20,把端口Ethernet1/1到Ethernet1/3添加到该VLAN中;在该VLAN内使能IGMPSnooping,并使能丢弃未知组播数据报文功能。[SwitchB]vlan20[SwitchB-vlan20]portethernet1/1toethernet1/3[SwitchB-vlan20]igmp-snoopingenable[SwitchB-vlan20]igmp-snoopingdrop-unknown[SwitchB-vlan20]return2.配置文件<SwitchB>displaycurrent-configuration#

sysnameSwitchB#igmp-snooping#vlan20

igmp-snoopingenable

igmp-snoopingdrop-unknown#interfaceEthernet1/1

portaccessvlan20#interfaceEthernet1/2

portaccessvlan20#interfaceEthernet1/3

portaccessvlan20#return3.3.7

SwitchC的配置1.配置步骤#全局使能IGMPSnooping。<SwitchC>system-view[SwitchC]igmp-snooping[SwitchC-igmp-snooping]quit#创建VLAN30,把端口Ethernet1/1到Ethernet1/3添加到该VLAN中;在该VLAN内使能IGMPSnooping,并使能丢弃未知组播数据报文功能。[SwitchC]vlan30[SwitchC-vlan30]portethernet1/1toethernet1/3[SwitchC-vlan30]igmp-snoopingenable[SwitchC-vlan30]igmp-snoopingdrop-unknown[SwitchC-vlan30]return2.配置文件<SwitchC>displaycurrent-configuration#

sysnameSwitchC#igmp-snooping#vlan30

igmp-snoopingenable

igmp-snoopingdrop-unknown#interfaceEthernet1/1

portaccessvlan30#interfaceEthernet1/2

portaccessvlan30#interfaceEthernet1/3

portaccessvlan30#return3.4

验证结果当如上配置完成后,HostA和HostC能够收到视频节目1,HostE能够收到视频节目2。此外,通过相应的display命令还可查看设备上的各种配置及运行效果:(1)

通过使用displaymulticast-vlan命令可以查看交换机上组播VLAN的信息。例如:#查看SwitchA上所有组播VLAN的信息。<SwitchA>displaymulticast-vlan

Total1multicast-vlan(s)

Multicastvlan5

subvlanlist:

vlan10

20

portlist:

noport由上可知,VLAN5为组播VLAN,VLAN10和VLAN20为其子VLAN。(2)

通过使用displayigmp-snoopinggroup命令可以查看各交换机上IGMPSnooping组播组的信息。例如:#查看SwitchA上IGMPSnooping组播组的信息。<SwitchA>displayigmp-snoopinggroup

Total3IPGroup(s).

Total3IPSource(s).

Total3MACGroup(s).

Portflags:D-Dynamicport,S-Staticport,C-Copyport

Subvlanflags:R-RealVLAN,C-CopyVLAN

Vlan(id):5.

Total1IPGroup(s).

Total1IPSource(s).

Total1MACGroup(s).

Routerport(s):total1port.

Eth1/1

(D)(00:01:30)

IPgroup(s):thefollowingipgroup(s)matchtoonemacgroup.

IPgroupaddress:

(,):

Hostport(s):total0port.

MACgroup(s):

MACgroupaddress:0100-5e01-0101

Hostport(s):total0port.

Vlan(id):10.

Total1IPGroup(s).

Total1IPSource(s).

Total1MACGroup(s).

Routerport(s):total0port.

IPgroup(s):thefollowingipgroup(s)matchtoonemacgroup.

IPgroupaddress:

(,):

Hostport(s):total1port.

Eth1/2

(D)(00:03:23)

MACgroup(s):

MACgroupaddress:0100-5e01-0101

Hostport(s):total1port.

Eth1/2

Vlan(id):20.

Total1IPGroup(s).

Total1IPSource(s).

Total1MACGroup(s).

Routerport(s):total0port.

IPgroup(s):thefollowingipgroup(s)matchtoonemacgroup.

IPgroupaddress:

(,):

Hostport(s):total1port.

Eth1/4

(D)(00:02:16)

MACgroup(s):

MACgroupaddress:0100-5e01-0101

Hostport(s):total1port.

Eth1/4#查看SwitchC上VLAN30内IGMPSnooping组播组的详细信息。<SwitchC>displayigmp-snoopinggroupvlan30verbose

Total1IPGroup(s).

Total1IPSource(s).

Total1MACGroup(s).

Portflags:D-Dynamicport,S-Staticport,C-Copyport

Subvlanflags:R-RealVLAN,C-CopyVLAN

Vlan(id):30.

Total1IPGroup(s).

Total1IPSource(s).

Total1MACGroup(s).

Routerport(s):total1port.

Eth1/1

(D)(00:01:15)

IPgroup(s):thefollowingipgroup(s)matchtoonemacgroup.

IPgroupaddress:

(,):

Attribute:

Host

Hostport(s):total1port.

Eth1/2

(D)(00:02:35)

MACgroup(s):

MACgroupaddress:0100-5e02-0202

Hostport(s):total1port.

Eth1/2由上可知,SwitchA的端口Ethernet1/2和Ethernet1/4下都有组播组G1的接收者,SwitchC的端口Ethernet1/2下有组播组G2的接收者。(3)

通过使用displayigmpinterface命令可以查看各路由器的主机侧接口上IGMP的配置和运行情况。例如:#查看RouterC的主机侧接口Ethernet1/1上IGMP的配置和运行情况。<RouterC>displayigmpinterfaceethernet1/1

Ethernet1/1():

IGMPisenabled

CurrentIGMPversionis2

ValueofqueryintervalforIGMP(inseconds):60

ValueofotherquerierpresentintervalforIGMP(inseconds):125

ValueofmaximumqueryresponsetimeforIGMP(inseconds):10

QuerierforIGMP:(thisrouter)

Total1IGMPGroupreported由上可知,RouterC的接口Ethernet1/1上运行了IGMPv2,并由该接口作为IGMP查询器。(4)

通过使用displaymsdpbrief命令可以查看路由器之间MSDP对等体建立的情况。例如:#查看RouterB上MSDP对等体的简要信息。<RouterB>displaymsdpbriefMSDPPeerBriefInformationofVPN-Instance:publicnet

Configured

Up

Listen

Connect

Shutdown

Down

1

1

0

0

0

0

Peer'sAddress

State

Up/Downtime

AS

SACount

ResetCount

Up

00:10:17

?

1

0#查看RouterC上MSDP对等体的简要信息。<RouterC>displaymsdpbriefMSDPPeerBriefInformationofVPN-Instance:publicnet

Configured

Up

Listen

Connect

Shutdown

Down

1

1

0

0

0

0

Peer'sAddress

State

Up/Downtime

AS

SACount

ResetCount

Up

00:10:17

?

1

0由上可知,RouterB和RouterC各自的Loopback1接口之间已建立起了MSDP对等体关系。(5)

通过使用displaypimrouting-table命令可以查看路由器上PIM路由表的内容。例如:#查看RouterB上有关组播组的PIM路由表内容。<RouterB>displaypimrouting-table

VPN-Instance:publicnet

Total1(*,G)entry;1(S,G)entry

Totalmatched0(*,G)entry;0(S,G)entry#查看RouterC上有关组播组的PIM路由表内容。<RouterC>displaypimrouting-table

VPN-Instance:publicnet

Total1(*,G)entry;1(S,G)entry

Totalmatched1(*,G)entry;1(S,G)entry

(*,)

RP:(local)

Protocol:pim-sm,Flag:WC

UpTime:00:15:04

Upstreaminterface:Register

Upstreamneighbor:NULL

RPFprimeneighbor:NULL

Downstreaminterface(s)information:

Totalnumberofdownstreams:1

1:Ethernet1/1

Protocol:igmp,UpTime:00:15:04,Expires:-

(00,)

RP:(local)

Protocol:pim-sm,Flag:SPT2MSDPACT

UpTime:00:20:28

Upstreaminterface:Serial2/1

Upstreamneighbor:

RPFprimeneighbor:

Downstreaminterface(s)information:

Totalnumberofdownstreams:1

1:Ethernet1/1

Protocol:pim-sm,UpTime:

-,Expires:

-由上可知,组播组G1当前有效的RP为RouterC的Loopback0接口。4

域间三层组播配置举例4.1

组网需求(1)

需求分析

两个ISP拥有各自的网络:AS100和AS200,AS内部通过OSPF协议互连。AS200中的视频源(Source)通过组播组G()传送节目,AS100和AS200中都有该节目的点播者(Receiver):HostA和HostB。要求在AS内通过使用PIM-SM和IGMP协议实现视频流的组播分发和按需送达。同时根据业务需要,AS100独自构成组播域PIM-SM1,而AS200则划分为两个组播域:PIM-SM2和PIM-SM3。

为了解决组播域之间、以及各AS之间组播信息的交换,要求通过配置MSDP对等体实现各PIM-SM域之间组播源信息的交换,通过配置MBGP协议实现各AS之间组播路由信息的交换。(2)

网络规划设备接口IP地址设备接口IP地址RouterAEth1//24RouterDEth1//24

S2/1/24

S2/1/24

S2/2/24

POS5/1/24

Loop0/32

Loop0/32RouterBS2/1/24RouterES2/1/24

S2/2/24

S2/2/24

Loop0/32

Loop0/32RouterCS2/1/24RouterFEth1//24

S2/2/24

S2/1/24

POS5/1/24

Loop0/32

Loop0/32Source-00/24图3

域间三层组播配置组网图4.2

配置思路(1)

配置域内组播路由:

在所有路由器上都配置OSPF协议,在其各接口上使能PIM-SM协议,并在RouterA和RouterD的主机侧接口上使能IGMP协议;

为了避免物理接口down而导致的网络振荡,将RouterC、RouterD和RouterE各自的Loopback0接口配置为C-BSR和C-RP;

划分PIM-SM域,将RouterC和RouterD各自的POS5/1接口、RouterD和RouterE各自的Serial2/1接口配置为BSR的服务边界(即PIM-SM域的边界)。(2)

配置域间组播路由:

在PIM-SM域的RP之间,即RouterC和RouterD、RouterD和RouterE之间分别建立MSDP对等体关系;

在所有相邻路由器之间建立MBGP对等体关系,即RouterA、RouterB和RouterC两两之间、RouterD和RouterE之间、RouterE和RouterF之间分别建立IBGP/MBGP对等体关系,RouterC和RouterD之间则建立EBGP/MBGP对等体关系。4.3

配置步骤

说明:以下配置均是在实验室环境下进行的配置和验证,配置前设备的所有参数均采用出厂时的缺省配置。如果您已经对设备进行了配置,为了保证配置效果,请确认现有配置和以下配置不冲突。本文档不严格与具体软、硬件版本对应。

4.3.1

RouterA的配置1.配置步骤#配置OSPF协议。<RouterA>system-view[RouterA]ospf1[RouterA-ospf-1]area[RouterA-ospf-1-area-]network[RouterA-ospf-1-area-]network55[RouterA-ospf-1-area-]network55[RouterA-ospf-1-area-]network55[RouterA-ospf-1-area-]quit[RouterA-ospf-1]quit#使能IP组播路由,在各接口上使能PIM-SM,并在主机侧接口上使能IGMP。[RouterA]multicastrouting-enable[RouterA]interfaceethernet1/1[RouterA-Ethernet1/1]pimsm[RouterA-Ethernet1/1]igmpenable[RouterA-Ethernet1/1]quit[RouterA]interfaceserial2/1[RouterA-Serial2/1]pimsm[RouterA-Serial2/1]quit[RouterA]interfaceserial2/2[RouterA-Serial2/2]pimsm[RouterA-Serial2/2]quit[RouterA]interfaceloopback0[RouterA-LoopBack0]pimsm[RouterA-LoopBack0]quit#配置BGP协议和MBGP对等体,并引入直连和OSPF路由。[RouterA]bgp100[RouterA-bgp]router-id[RouterA-bgp]peeras-number100[RouterA-bgp]peeras-number100[RouterA-bgp]import-routedirect[RouterA-bgp]import-routeospf1[RouterA-bgp]ipv4-familymulticast[RouterA-bgp-af-mul]peerenable[RouterA-bgp-af-mul]peerenable[RouterA-bgp-af-mul]import-routedirect[RouterA-bgp-af-mul]import-routeospf1[RouterA-bgp-af-mul]return2.配置文件<RouterA>displaycurrent-configuration#

sysnameRouterA#

multicastrouting-enable#interfaceEthernet1/1

portlink-moderoute

ipaddress

igmpenable

pimsm#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#interfaceSerial2/2

link-protocolppp

ipaddress

pimsm#interfaceLoopBack0

ipaddress55

pimsm#bgp100

router-id

import-routedirect

import-routeospf1

undosynchronization

peeras-number100

peeras-number100

#

ipv4-familymulticast

import-routedirect

import-routeospf1

peerenable

peerenable#ospf1

area

network

network55

network55

network55#return4.3.2

RouterB的配置1.配置步骤#配置OSPF协议。<RouterB>system-view[RouterB]ospf1[RouterB-ospf-1]area[RouterB-ospf-1-area-]network[RouterB-ospf-1-area-]network55[RouterB-ospf-1-area-]network55[RouterB-ospf-1-area-]quit[RouterB-ospf-1]quit#使能IP组播路由,并在各接口上使能PIM-SM。[RouterB]multicastrouting-enable[RouterB]interfaceserial2/1[RouterB-Serial2/1]pimsm[RouterB-Serial2/1]quit[RouterB]interfaceserial2/2[RouterB-Serial2/2]pimsm[RouterB-Serial2/2]quit[RouterB]interfaceloopback0[RouterB-LoopBack0]pimsm[RouterB-LoopBack0]quit#配置BGP协议和MBGP对等体,并引入OSPF路由。[RouterB]bgp100[RouterB-bgp]router-id[RouterB-bgp]peeras-number100[RouterB-bgp]peeras-number100[RouterB-bgp]import-routeospf1[RouterB-bgp]ipv4-familymulticast[RouterB-bgp-af-mul]peerenable[RouterB-bgp-af-mul]peerenable[RouterB-bgp-af-mul]import-routeospf1[RouterB-bgp-af-mul]return2.配置文件<RouterB>displaycurrent-configuration#

sysnameRouterB#

multicastrouting-enable#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#interfaceSerial2/2

link-protocolppp

ipaddress

pimsm#interfaceLoopBack0

ipaddress55

pimsm#bgp100

router-id

import-routeospf1

undosynchronization

peeras-number100

peeras-number100

#

ipv4-familymulticast

import-routeospf1

peerenable

peerenable#ospf1

area

network

network55

network55#return4.3.3

RouterC的配置1.配置步骤#配置OSPF协议。<RouterC>system-view[RouterC]ospf1[RouterC-ospf-1]area[RouterC-ospf-1-area-]network[RouterC-ospf-1-area-]network55[RouterC-ospf-1-area-]network55[RouterC-ospf-1-area-]network55[RouterC-ospf-1-area-]quit[RouterC-ospf-1]quit#使能IP组播路由,并在各接口上使能PIM-SM。[RouterC]multicastrouting-enable[RouterC]interfaceserial2/1[RouterC-Serial2/1]pimsm[RouterC-Serial2/1]quit[RouterC]interfaceserial2/2[RouterC-Serial2/2]pimsm[RouterC-Serial2/2]quit[RouterC]interfacepos5/1[RouterC-Pos5/1]pimsm[RouterC-Pos5/1]quit[RouterC]interfaceloopback0[RouterC-LoopBack0]pimsm[RouterC-LoopBack0]quit#配置BSR的服务边界。[RouterC]interfacepos5/1[RouterC-Pos5/1]pimbsr-boundary[RouterC-Pos5/1]quit#将Loopback0接口配置为C-BSR和C-RP。[RouterC]pim[RouterC-pim]c-bsrloopback0[RouterC-pim]c-rploopback0[RouterC-pim]quit#配置BGP协议和MBGP对等体,并引入OSPF路由。[RouterC]bgp100[RouterC-bgp]router-id[RouterC-bgp]peeras-number100[RouterC-bgp]peeras-number100[RouterC-bgp]peeras-number200[RouterC-bgp]import-routeospf1[RouterC-bgp]ipv4-familymulticast[RouterC-bgp-af-mul]peerenable[RouterC-bgp-af-mul]peerenable[RouterC-bgp-af-mul]peerenable[RouterC-bgp-af-mul]import-routeospf1[RouterC-bgp-af-mul]quit[RouterC-bgp]quit#配置MSDP对等体。[RouterC]msdp[RouterC-msdp]peerconnect-interfacepos5/1[RouterC-msdp]return2.配置文件<RouterC>displaycurrent-configuration#

sysnameRouterC#

multicastrouting-enable#interfaceSerial2/1

link-protocolppp

ipaddress

pimsm#interfaceSerial2/2

link-protocolppp

ipaddress

pimsm#interfacePos5/1

link-protocolppp

ipaddress

pimbsr-boundary

pimsm#interfaceLoopBack0

ipaddress55

pimsm#bgp100

router-id

import-routeospf1

undosynchronization

peeras-number100

peeras-number100

peeras-number200#

ipv4-familymulticast

import-routeospf1

peerenable

peerenable

peerenable#ospf1

area

network

network55

network55

network55#pim

c-bsrLoopBack0

c-rpLoopBack0#msdp

peerconnect-interfacePos5/1#return4.3.4

RouterD的配置1.配置步骤#配置OSPF协议。<RouterD>system-view[RouterD]ospf1[RouterD-ospf-1]area[RouterD-ospf-1-area-]network[RouterD-ospf-1-area-]network55[RouterD-ospf-1-area-]network55[RouterD-ospf-1-area-]network55[RouterD-ospf-1-area-]quit[RouterD-ospf-1]quit#使能IP组播路由,在各接口上使能PIM-SM,并在主机侧接口上使能IGMP。[RouterD]multicastrouting-enable[RouterD]interfaceethernet1/1[RouterD-Ethernet1/1]pimsm[RouterD-Ethernet1/1]igmpenable[RouterD-Ethernet1/1]quit[RouterD]interfaceserial2/1[RouterD-Serial2/1]pimsm[RouterD-Serial2/1]quit[RouterD]interfacepos5/1[RouterD-Pos5/1]pimsm[RouterD-Pos5/1]quit[RouterD]interfaceloopback0[RouterD-LoopBack0]pimsm[RouterD-LoopBack0]quit#配置BSR的服务边界。[RouterD]interfaceserial2/1[RouterD-Serial2/1]pimbsr-boundary[RouterD-Serial2/1]quit[RouterD]interfacepos5/1[RouterD-Pos5/1]pimbsr-boundary[RouterD-Pos5/1]quit#将Loopback0接口配置为C-BSR和C-RP。[RouterD]pim[RouterD-pim]c-bsrloopback0[RouterD-pim]c-rploopback0[RouterD-pim]quit#配置BGP协议和MBGP对等体,并引入直连和OSPF路由。[RouterD]bgp200[RouterD-bgp]router-id[RouterD-bgp]peeras-number100[RouterD-bgp]peeras-number200[RouterD-bgp]import-routedirect[RouterD-bgp]import-routeospf1[RouterD-bgp]ipv4-familymulticast[RouterD-bgp-af-mul]peerenable[RouterD-bgp-af-mul]peerenable[RouterD-bgp-af-mul]import-routedirect[RouterD-bgp-af-mul]import-routeospf1[RouterD-bgp-af-mul]quit[RouterD-bgp]quit#配置MSDP对等体。[RouterD]msdp[RouterD-msdp]peerconnect-interfacepos5/1[RouterD-msdp]peerconnect-interfaceserial2/1[RouterD-msdp]return2.配置文件<RouterD>displaycurrent-configuration#

sysnameRouterD#

multicastrouting-enable#interfaceEthernet1/1

portlink-moderoute

ipaddress

igmpenable

pimsm#interfaceSerial2/1

link-protocolppp

ipaddress

pimbsr-boundary

pimsm#interfacePos5/1

link-protocolppp

ipaddress

pimbsr-boundary

pimsm#interfaceLoopBack0

ipaddress55

pimsm#bgp200

router-id

import-routedirect

import-routeospf1

undosynchronization

peeras-number100

peeras-number200#

ipv4-familymulticast

import-routedirect

import-routeospf1

peerenable

peerenable#ospf1

area

network

network55

network55

network55#pim

c-bsrLoopBack0

c-rpLoopBack0#msdp

peerconnect-interfacePos5/1

peerconnect-interfaceSerial2/1#return4.3.5

RouterE的配置1.配置步骤#配置OSPF协议。<RouterE>system-view[RouterE]ospf1[RouterE-ospf-1]area[RouterE-ospf-1-area-]network[RouterE-ospf-1-area-]network55[RouterE-ospf-1-area-]network55[RouterE-ospf-1-area-]quit[RouterE-ospf-1]quit#使能IP组播路由,并在各接口上使能PIM-SM。[RouterE]multicastrouting-enable[RouterE]interfaceserial2/1[RouterE-Serial2/1]pimsm[RouterE-Serial2/1]quit[RouterE]interfaceserial2/2[RouterE-Serial2/2]pimsm[RouterE-Serial2/2]quit[RouterE]interfaceloopback0[RouterE-LoopBack0]pimsm[RouterE-LoopBack0]quit#配置BSR的服务边界。[RouterE]interfaceserial2/1[RouterE-Serial2/1]pimbsr-boundary[RouterE-Serial2/1]quit#将Loopback0接口配置为C-BSR和C-RP。[RouterE]pim[RouterE-pim]c-bsrloopback0[RouterE-pim]c-rploopback0[RouterE-pim]quit#配置BGP协议和MBGP对等体,并引入OSPF路由。[RouterE]bgp200[RouterE-bgp]router-id[RouterE-bgp]peeras-number200[RouterE-bgp]peeras-number200[RouterE-bgp]import-routeospf1[RouterE-bgp]ipv4-familymulticast[RouterE-bgp-af-mul]peerenable[RouterE-bgp-af-mul]peerenable[RouterE-bgp-af-mul]import-routeospf1[RouterE-bgp-af-mul]quit[RouterE-bgp]quit#配置MSDP对等体。[RouterE]msdp[RouterE-msdp]peerconnect-interfaceserial2/1[RouterE-msdp]return2.配置文件<RouterE>displaycurrent-configuration#

sysnameRouterE#

multicastrouting-enable#interfaceSerial2/1

link-protocolppp

ipaddress

pimbsr-boundary

pimsm#interfaceSerial2/2

link-protocolppp

ipaddress

pimsm#interfaceLoopBack0

ipaddress55

pimsm#bgp200

router-id

import-routeospf1

undosynchronization

peeras-number200

peeras-number200#

ipv4-familymulticast

import-routeospf1

peer

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