8.8 RP的发现

1.基本概念

静态RP适用于规模较小的组播网络，BSR使得PIM-SM路由器能够动态的发现与组播对应的RP。

2.静态RP关联ACL

1）R1配置

[R1]acl 2000
[R1-acl-basic-2000]rule permit source 239.0.0.0 0.0.0.127
[R1-acl-basic-2000]quit
[R1]acl 2001 
[R1-acl-basic-2001]rule permit source 239.0.0.128 0.0.0.127
[R1-acl-basic-2001]quit
[R1]pim
[R1-pim]static-rp 2.2.2.2 2000
[R1-pim]static-rp 3.3.3.3 2001

2）R2配置

[R2]interface LoopBack 0
[R2-LoopBack0]ip address 2.2.2.2 32
[R2]ospf 1
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0
[R2]acl 2000
[R2-acl-basic-2000]rule permit source 239.0.0.0 0.0.0.127
[R2-acl-basic-2000]quit
[R2]acl 2001 
[R2-acl-basic-2001]rule permit source 239.0.0.128 0.0.0.127
[R2-acl-basic-2001]quit
[R2]pim
[R2-pim]static-rp 2.2.2.2 2000
[R2-pim]static-rp 3.3.3.3 2001

3）R3配置

[R3]acl 2000
[R3-acl-basic-2000]rule permit source 239.0.0.0 0.0.0.127
[R3-acl-basic-2000]quit
[R3]acl 2001 
[R3-acl-basic-2001]rule permit source 239.0.0.128 0.0.0.127
[R3-acl-basic-2001]quit
[R3]pim
[R3-pim]static-rp 2.2.2.2 2000
[R3-pim]static-rp 3.3.3.3 2001

4）R4配置

[R4]acl 2000
[R4-acl-basic-2000]rule permit source 239.0.0.0 0.0.0.127
[R4-acl-basic-2000]quit
[R4]acl 2001                              
[R4-acl-basic-2001]rule permit source 239.0.0.128 0.0.0.127
[R4-pim]pim
[R4-pim]static-rp 2.2.2.2 2000
[R4-pim]static-rp 3.3.3.3 2001

4）查看pim信息（239.0.0.100、239.0.0.200）

<R4>display pim rp 239.0.0.100
 VPN-Instance: public net
 Static RP Address is: 2.2.2.2
         Configured ACL: 2000
 RP mapping for this group is: 2.2.2.2

<R4>display pim rp 239.0.0.200
 VPN-Instance: public net
 Static RP Address is: 3.3.3.3
         Configured ACL: 2001
 RP mapping for this group is: 3.3.3.3

3.BSR

RP是组播网络中数据组播汇聚中心。

C-RP为候选RP。

BSR是组播网络中管理中心，用于管理动态选举RP。

C-BSR是BSR的候选者。

4.BSR基础配置

1）R3配置

[R3]multicast routing-enable
[R3]interface LoopBack 0
[R3-LoopBack0]ip address 3.3.3.3 32
[R3-LoopBack0]pim sm
[R3]pim 
[R3-pim]c-bsr LoopBack 0

2）R5配置

[R5]multicast routing-enable 
[R5]interface LoopBack 0
[R5-LoopBack0]ip address 5.5.5.5 32
[R5-LoopBack0]pim sm
[R5-pim]c-bsr priority 100
[R5-pim]c-bsr LoopBack 0

3）R2配置

[R2]multicast routing-enable 
[R2]interface LoopBack 0
[R2-LoopBack0]ip address 2.2.2.2 32
[R2-LoopBack0]pim sm
[R2-pim]c-rp LoopBack 0

4）R4配置（缺省时，C-RP为所有组播服务，缺省优先级为0）

[R4]multicast routing-enable 
[R4]interface LoopBack 0
[R4-LoopBack0]ip address 4.4.4.4 32
[R4-LoopBack0]pim sm
[R4]acl 2000
[R4-acl-basic-2000]rule permit source 239.0.0.0 0.0.0.255
[R4-pim]c-rp LoopBack 0 group-policy 2000 priority 100