47.组播-断言机制.docx

组播-断言机制当没有接收者时，R2和R4都会被pruneR1#ping 224.1.1.1 repeat 100Type escape sequence to abort.Sending 100, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:.R5#debug ip mpacket IP multicast packets debugging is onR5#debug ip pim 224.1.1.1PIM debugging is onR5#*Mar 25 09:25:06.787: IP(0): s=192.168.15.1 (Serial1/0) d=224.1.1.1 (Serial1/1) 把组播流量从S1/1口发出id=0, ttl=254, prot=1, len=100(100), mforward*Mar 25 09:25:06.795: IP(0): s=192.168.15.1 (Serial1/0) d=224.1.1.1 (Serial1/3)把组播流量从S1/3口发出 id=0, ttl=254, prot=1, len=100(100), mforward*Mar 25 09:25:06.895: PIM(0): Received v2 Join/Prune on Serial1/1 from 192.168.52.2, to us*Mar 25 09:25:06.895: PIM(0): Prune-list: (192.168.15.1/32, 224.1.1.1) *Mar 25 09:25:06.895: PIM(0): Prune Serial1/1/224.1.1.1 from (192.168.15.1/32, 224.1.1.1)R5#从R2收到prune消息*Mar 25 09:25:11.267: PIM(0): Received v2 Join/Prune on Serial1/3 from 192.168.54.4, to us*Mar 25 09:25:11.271: PIM(0): Prune-list: (192.168.15.1/32, 224.1.1.1) *Mar 25 09:25:11.275: PIM(0): Prune Serial1/3/224.1.1.1 from (192.168.15.1/32, 224.1.1.1)从R4收到prune消息R5#*Mar 25 09:28:08.803: IP(0): s=192.168.15.1 (Serial1/0) d=224.1.1.1 (Serial1/1) id=91, ttl=254, prot=1, len=100(100), mforward*Mar 25 09:28:08.807: IP(0): s=192.168.15.1 (Serial1/0) d=224.1.1.1 (Serial1/3) id=91, ttl=254, prot=1, len=100(100), mforward3秒钟后再次转发流量*Mar 25 09:28:08.915: PIM(0): Received v2 Join/Prune on Serial1/1 from 192.168.52.2, to us*Mar 25 09:28:08.919: PIM(0): Prune-list: (192.168.15.1/32, 224.1.1.1) *Mar 25 09:28:08.919: PIM(0): Prune Serial1/1/224.1.1.1 from (192.168.15.1/32, 224.1.1.1)这次收到了来自R2的prune消息，因为R2选举失败R2#debug ip pim 224.1.1.1PIM debugging is onR2#debug ip mpacket IP multicast packets debugging is onR2#*Mar 25 09:25:06.079: IP(0): s=192.168.15.1 (Serial1/2) d=224.1.1.1 (FastEthernet0/0)从F0/0把流量转发出去 id=0, ttl=253, prot=1, len=100(100), mforward*Mar 25 09:25:06.111: PIM(0): Send v2 Assert on FastEthernet0/0 for 224.1.1.1, source 192.168.15.1, metric 120/1 并发送一个v2的Assert报文到224.1.1.1，其中含有AD和metric*Mar 25 09:25:06.111: PIM(0): Assert metric to source 192.168.15.1 is 120/1*Mar 25 09:25:06.111: PIM(0): We win, our metric 120/1第一次发送出去默认“我们赢了”，选举成功，因为还没有“对手”*Mar 25 09:25:06.111: PIM(0): Schedule to prune FastEthernet0/0*Mar 25 09:25:06.111: PIM(0): (192.168.15.1/32, 224.1.1.1) oif FastEthernet0/0 in Forward state*Mar 25 09:25:06.111: IP(0): s=192.168.15.1 (FastEthernet0/0) d=224.1.1.1 id=0, ttl=252, prot=1, len=114(100), not RPF interface从F0/0收到了组播流量，RPF检测失败*Mar 25 09:25:06.119: PIM(0): Received v2 Assert on FastEthernet0/0 from 10.0.0.4从F0/0收到来自R4的assert报文*Mar 25 09:25:06.123: PIM(0): Assert metric to source 192.168.15.1 is 90/2681856对方的AD和metirc*Mar 25 09:25:06.123: PIM(0): We lose, our metric 120/1经过比较，我们输了*Mar 25 09:25:06.127: PIM(0): Prune FastEthernet0/0/224.1.1.1 from (192.168.15.1/32, 224.1.1R2#.1)准备剪枝*Mar 25 09:25:06.127: PIM(0): Insert (192.168.15.1,224.1.1.1) prune in nbr 192.168.52.5s queue*Mar 25 09:25:06.131: PIM(0): (192.168.15.1/32, 224.1.1.1) oif FastEthernet0/0 in Prune state*Mar 25 09:25:06.139: PIM(0): Building Join/Prune packet for nbr 192.168.52.5*Mar 25 09:25:06.143: PIM(0): Adding v2 (192.168.15.1/32, 224.1.1.1) Prune*Mar 25 09:25:06.147: PIM(0): Send v2 join/prune to 192.168.52.5 (Serial1/2)发送prune报文并被剪枝*Mar 25 09:25:07.011: PIM(0): Received v2 Assert on FastEthernet0/0 from 10.0.0.4*Mar 25 09:25:07.015: PIM(0): Assert metric to source 192.168.15.1 is 90/2681856*Mar 25 09:25:07.015: PIM(0): We lose, our metric 120/1*Mar 25 09:25:07.019: PIM(0): (192.168.15.1/32, 224.1.1.1) oif FastEthernet0/0 in Prune stateR4#debug ip pim 224.1.1.1 PIM debugging is onR4#debug ip mpacket IP multicast packets debugging is onR4#*Mar 25 09:25:06.263: IP(0): s=192.168.15.1 (Serial1/2) d=224.1.1.1 (FastEthernet0/0) id=0, ttl=253, prot=1, len=100(100), mforward*Mar 25 09:25:06.283: PIM(0): Send v2 Assert on FastEthernet0/0 for 224.1.1.1, source 192.168.15.1, metric 90/2681856 *Mar 25 09:25:06.287: PIM(0): Assert metric to source 192.168.15.1 is 90/2681856*Mar 25 09:25:06.287: PIM(0): We win, our metric 90/2681856*Mar 25 09:25:06.291: PIM(0): Schedule to prune FastEthernet0/0*Mar 25 09:25:06.291: PIM(0): (192.168.15.1/32, 224.1.1.1) oif FastEthernet0/0 in Forward state第一次发送assert报文*Mar 25 09:25:06.295: IP(0): s=192.168.15.1 (FastEthernet0/0) d=224.1.1.1 id=0, ttl=252, prot=1,R4# len=114(100), not RPF interface同样从F0/0收到组播流量，RPF检测失败*Mar 25 09:25:06.303: PIM(0): Received v2 Assert on FastEthernet0/0 from 10.0.0.2*Mar 25 09:25:06.307: PIM(0): Assert metric to source 192.168.15.1 is 120/1*Mar 25 09:25:06.307: PIM(0): We win, our metric 90/2681856通过比较，我们赢了，当选DR*Mar 25 09:25:06.311: PIM(0): (192.168.15.1/32, 224.1.1.1) oif FastEthernet0/0 in Forward state*Mar 25 09:25:07.219: PIM(0): Send v2 Assert on FastEthernet0/0 for 224.1.1.1, source 192.168.15.1, metric 90/2681856 *Mar 25 09:25:07.219: PIM(0): Assert metric to source 192.168.15.1 is 90/2681856*Mar 25 09:25:07.219: PIM(0): We win, our metric 90/2681856R4#*Mar 25 09:25:07.219: PIM(0): (192.168.15.1/32, 224.1.1.1) oif FastEthernet0/0 in Forward state*Mar 25 09:25:10.731: PIM(0): Prune FastEthernet0/0/224.1.1.1 from (192.168.15.1/32, 224.1.1.1)*Mar 25 09:25:10.735: PIM(0): Insert (192.168.15.1,224.1.1.1) prune in nbr 192.168.54.5s queue*Mar 25 09:25:10.735: PIM(0): Building Join/Prune packet for nbr 192.168.54.5*Mar 25 09:25:10.735: PIM(0): Adding v2 (192.168.15.1/32, 224.1.1.1) Prune*Mar 25 09:25:10.735: PIM(0): Send v2 join/prune to 192.168.54.5 (Serial1/2)由于被有接收者，被剪枝R2#sh ip mroute Outgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode(*, 224.1.1.1), 00:01:27/stopped, RP 0.0.0.0, flags: D Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: FastEthernet0/0, Forward/Dense, 00:01:27/00:00:00 Serial1/2, Forward/Dense, 00:01:27/00:00:00(192.168.15.1, 224.1.1.1), 00:01:27/00:01:39, flags: PT Incoming interface: Serial1/2, RPF nbr 192.168.52.5 Outgoing interface list: FastEthernet0/0, Prune/Dense, 00:01:27/00:01:33F0/0被Prune(*, 224.0.1.40), 00:03:00/stopped, RP 0.0.0.0, flags: DCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: FastEthernet0/0, Forward/Dense, 00:02:47/00:00:00Serial1/2, Forward/Dense, 00:03:00/00:00:00R4#sh ip mroute IP Multicast Routing TableOutgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode(*, 224.1.1.1), 00:01:45/stopped, RP 0.0.0.0, flags: D Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: FastEthernet0/0, Forward/Dense, 00:01:45/00:00:00 Serial1/2, Forward/Dense, 00:01:45/00:00:00(192.168.15.1, 224.1.1.1), 00:01:45/00:01:22, flags: PT Incoming interface: Serial1/2, RPF nbr 192.168.54.5 Outgoing interface list: FastEthernet0/0, Prune/Dense, 00:01:41/00:01:18, F0/0被Prune AA - Assert winner(*, 224.0.1.40), 00:03:08/stopped, RP 0.0.0.0, flags: DCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: FastEthernet0/0, Forward/Dense, 00:03:05/00:00:00 Serial1/2, Forward/Dense, 00:03:08/00:00:00在R2上查看PIM邻居R2#sh ip pim neighbor PIM Neighbor TableMode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority, S - State Refresh CapableNeighbor Interface Uptime/Expires Ver DRAddress Prio/Mode192.168.52.5 Serial1/2 00:25:51/00:01:29 v2 1 / S10.0.0.4 FastEthernet0/0 00:26:07/00:01:43 v2 1 / DR SR4当选DRR4是DR，一旦有组播流量就负责转发流量现在R3加入组R3(config-if)#ip igmp join-group 224.1.1.1R2和R4都收到来自R3-PC的graft报文R2#*Mar 25 09:53:27.463: PIM(0): Building Graft message for 224.1.1.1, FastEthernet0/0: no entries*Mar 25 09:53:27.463: PIM(0): Building Graft message for 224.1.1.1, Serial1/2: 192.168.15.1/32*Mar 25 09:53:27.467: PIM(0): Send v2 Graft to 192.168.52.5 (Serial1/2)*Mar 25 09:53:27.555: PIM(0): Received v2 Graft-Ack on Serial1/2 from 192.168.52.5*Mar 25 09:53:27.555: Group 224.1.1.1: 192.168.15.1/32R4#*Mar 25 09:53:27.695: PIM(0): Building Graft message for 224.1.1.1, FastEthernet0/0: no entries*Mar 25 09:53:27.699: PIM(0): Building Graft message for 224.1.1.1, Serial1/2: 192.168.15.1/32*Mar 25 09:53:27.703: PIM(0): Send v2 Graft to 192.168.54.5 (Serial1/2)*Mar 25 09:53:27.767: PIM(0): Received v2 Graft-Ack on Serial1/2 from 192.168.54.5*Mar 25 09:53:27.767: Group 224.1.1.1: 192.168.15.1/32现在R1上PING 224.1.1.1R1#ping 224.1.1.1 repeat 3Type escape sequence to abort.Sending 3, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:Reply to request 0 from 10.0.0.3, 8 msReply to request 1 from 10.0.0.3, 8 msReply to request 2 from 10.0.0.3, 20 msR2上没有转发流量R2(config-if)#*Mar 25 09:56:57.639: IP(0): s=192.168.15.1 (FastEthernet0/0) d=224.1.1.1 id=108, ttl=252, prot=1, len=114(100), not RPF interfaceR2(config-if)#*Mar 25 09:56:59.663: IP(0): s=192.168.15.1 (FastEthernet0/0) d=224.1.1.1 id=109, ttl=252, prot=1, len=114(100), not RPF interfaceR4上转发了流量R4(config-if)#*Mar 25 09:56:55.839: IP(0): s=192.168.15.1 (Serial1/2) d=224.1.1.1 (FastEthernet0/0) id=107, ttl=253, prot=1, len=100(100), mforwardR4(config-if)#*Mar 25 09:56:57.855: IP(0): s=192.168.15.1 (Serial1/2) d=224.1.1.1 (FastEthernet0/0) id=108, ttl=253, prot=1, len=100(100), mforwardR4(config-if)#*Mar 25 09:56:59.843: IP(0): s=192.168.15.1 (Serial1/2) d=224.1.1.1 (FastEthernet0/0) id=109, ttl=253, prot=1, len=100(100), mforward再看R5的组播路由表R5(config-if)#do sh ip mrouIP Multicast Routing TableOutgoing interface flags: H - Hardware switched, A - Assert winner Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode(*, 224.1.1.1), 00:00:19/stopped, RP 0.0.0.0, flags: D Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Serial1/0, Forward/Dense, 00:00:19/00:00:00 Serial1/1, Forward/Dense, 00:00:19/00:00:00 Serial1/3, Forward/Dense, 00:00:19/00:00:00(192.168.15.1, 224.1.1.1), 00:00:19/00:02:45, flags: T Incoming interface: Serial1/0, RPF nbr 0.0.0.0 Outgoing interface list: Serial1/1, Prune/Dense, 00:00:19/00:02:40 Serial1/3, Forward/Dense, 00:00:19/00:00:00OIL中S1/1被剪枝，而S1/3转发流量(*, 224.0.1.40), 00:40:56/stopped, RP 0.0.0.0, flags: DCL Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Serial1/0, Forward/Dense, 00:40:56/00:00:00 Serial1/1, Forward/Dense, 00:40:38/00:00:00 Serial1/3, Forward/Dense, 00:40:27/00:00:00R4为DR,优先级为1R4#sh ip pim int f0/0Address Interface Ver/ Nbr Query DR DR Mode Count Intvl Prior10.0.0.4 FastEthernet0/0 v2/D 1 30 1 10.0.0.4修改R2的优先级为2，抢占DRR2(config-if)#ip pim dr-priority ? DR priority, preference given to larger valueR