S2700, S3700 V100R006C05 配置指南-IP组播
配置PIM BFD示例
组网需求
在图4-5所示的组播网络中,Switch之间已完成PIM-SM基本配置,用户主机正常接收来自组播源Source的组播数据。SwitchA是组播源端DR,SwitchB和SwitchC同时连接用户主机网段。要求当组成员端DR变化时,能够快速响应。
解决方案:在用户主机网段建立BFD Session,快速响应DR变化。
操作步骤
- 使能全局BFD,在接口下配置PIM BFD。
在SwitchB和SwitchC上全局使能BFD,并在连接用户主机网段的接口上使能PIM BFD功能,配置PIM BFD参数。SwitchC的配置过程与SwitchB相似,配置过程略。
[SwitchB] bfd [SwitchB-bfd] quit [SwitchB] interface vlanif 100 [SwitchB-Vlanif100] pim bfd enable [SwitchB-Vlanif100] pim bfd min-tx-interval 100 min-rx-interval 100 detect-multiplie 3
- 验证配置结果。
使用display pim interface verbose命令,可以查看PIM接口上的详细信息。SwitchB上的PIM接口信息表明用户主机网段的DR为SwitchC,接口使能了PIM BFD。
<SwitchB> display pim interface vlanif100 verbose VPN-Instance: public net Interface: Vlanif100, 10.1.1.1 PIM version: 2 PIM mode: Sparse PIM state: up PIM DR: 10.1.1.2 PIM DR Priority (configured): 1 PIM neighbor count: 1 PIM hello interval: 30 s PIM LAN delay (negotiated): 500 ms PIM LAN delay (configured): 500 ms PIM hello override interval (negotiated): 2500 ms PIM hello override interval (configured): 2500 ms PIM generation ID: 0XF5712241 PIM require-GenID: disabled PIM hello hold interval: 105 s PIM assert hold interval: 180 s PIM triggered hello delay: 5 s PIM J/P interval: 60 s PIM J/P hold interval: 210 s PIM BSR domain border: disabled PIM BFD: enabled PIM BFD min-tx-interval: 100 ms PIM BFD min-rx-interval: 100 ms PIM BFD detect-multiplier: 3 Number of routers on link not using DR priority: 0 Number of routers on link not using LAN delay: 0
# 使用display pim bfd session显示各Switch的BFD Session信息,查看BFD Session是否建立。
<SwitchB> display pim bfd session VPN-Instance: public net Total 1 BFD session Created Vlanif100 (10.1.1.1): Total 1 BFD session Created Neighbor ActTx(ms) ActRx(ms) ActMulti Local/Remote State 10.1.1.2 100 100 3 8192/8192 Up
# 使用display pim routing-table命令可以查看PIM路由表。SwitchC作为DR,存在(S,G)和(*,G)表项。显示信息如下:
<SwitchC> display pim routing-table VPN-Instance: public net Total 1 (*, G) entry; 1 (S, G) entry (*, 225.1.1.1) RP: 10.1.5.2 Protocol: pim-sm, Flag: WC UpTime: 00:13:46 Upstream interface: Vlanif200, Upstream neighbor: 10.1.2.2 RPF prime neighbor: 10.1.2.2 Downstream interface(s) information: Total number of downstreams: 1 1: Vlanif100, Protocol: pim-sm, UpTime: 00:13:46, Expires:- (10.1.7.1, 225.1.1.1) RP: 10.1.5.2 Protocol: pim-sm, Flag: SPT ACT UpTime: 00:00:42 Upstream interface: Vlanif200 Upstream neighbor: 10.1.2.2 RPF prime neighbor: 10.1.2.2 Downstream interface(s) information: Total number of downstreams: 1 1: Vlanif100 Protocol: pim-sm, UpTime: 00:00:42, Expires:-
配置文件
SwitchA只需配置PIM SM的基本功能,在本例中不重点关注,配置文件略。
- SwitchB的配置文件如下。SwitchC的配置文件与SwitchB相似,内容略。
# sysname SwitchB # vlan batch 100 200 # multicast routing-enable # bfd # interface Vlanif100 ip address 10.1.1.1 255.255.255.0 pim sm pim bfd enable pim bfd min-tx-interval 100 min-rx-interval 100 igmp enable # interface Vlanif200 ip address 10.1.2.1 255.255.255.0 pim sm # interface Ethernet0/0/1 port hybrid pvid vlan 200 port hybrid untagged vlan 200 # interface Ethernet0/0/2 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # ospf 1 area 0.0.0.0 network 10.1.1.0 0.0.0.255 network 10.1.2.0 0.0.0.255 # return
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