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在cisco 3750路由器上验证igmpv3以及PIM功能，用了两个FE口，FE0/0和FE0/1，FE0/1连一台PC，运行igmp测试软件（发igmpV3的协议包），FE0/0连另一台PC，这台PC作为流量发生器，向FE0/0发组播数据，同时在另一台PC上上抓包验证。
问题是：3750显示出来的组播组信息和组播路由表不一致。
Router#sh version
Cisco IOS Software, 3700 Software (C3725-JSX-M), Version 12.3(8)T, RELEASE SOFTW
ARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright © 1986-2004 by Cisco Systems, Inc.
Compiled Thu 13-May-04 18:22 by eaarmas
下面是FE0/1上的组播组信息，可以看出，此时FE0/1在225.1.1.1这个组播组上的filter mode是INCLUDE，同时source address是10.1.1.1和10.1.1.2，也就是说，和FE0/1相连的系统只接收从10.1.1.1和10.1.1.2发向225.1.1.1的组播数据。
Router#sh ip igmp groups fastEthernet 0/1 detail
Flags: L - Local, U - User, SG - Static Group, VG - Virtual Group,
SS - Static Source, VS - Virtual Source
Interface: FastEthernet0/1
Group: 225.1.1.1
Flags:
Uptime: 00:00:44
Group mode: INCLUDE
Last reporter: 120.0.0.1
Group source list: (C - Cisco Src Report, U - URD, R - Remote, S - Static,
V - Virtual, Ac - Accounted towards access control limit,
M - SSM Mapping)
Source Address Uptime v3 Exp CSR Exp Fwd Flags
10.1.1.1 00:00:44 00:04:28 stopped Yes R
10.1.1.2 00:00:44 00:04:28 stopped Yes R
但是，组播路由表却显示，从10.1.1.1，10.1.1.2，10.1.1.3和10.1.1.4这4个源地址发向225.1.1.1的组播数据都可以从FE0/1转发出去，这是不是和FE0/1上的组播组信息不一致？实际测试结果也表明，和FE0/1相连的PC是可以收到这四个源地址发出的数据。
接口上的组播组信息和组播路由信息之间的关系如何？为何不一致？
Router#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 225.1.1.1), 00:00:54/stopped, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/1, Forward/Sparse-Dense, 00:00:19/00:00:00
(10.1.1.1, 225.1.1.1), 00:00:46/00:02:51, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/1, Forward/Sparse-Dense, 00:00:19/00:00:00
(10.1.1.2, 225.1.1.1), 00:00:47/00:02:50, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/1, Forward/Sparse-Dense, 00:00:20/00:00:00
(10.1.1.3, 225.1.1.1), 00:00:47/00:02:50, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/1, Forward/Sparse-Dense, 00:00:20/00:00:00
(10.1.1.4, 225.1.1.1), 00:00:48/00:02:59, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/1, Forward/Sparse-Dense, 00:00:21/00:00:00
(*, 224.0.1.40), 07:19:38/00:04:04, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse-Dense, 07:19:38/00:00:00
恳请各位给我点建议，谢谢大家！ |
