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3com S7906E 安装指导

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         1: Vlan-interface200 
             Protocol: igmp, UpTime: 00:04:25, Expires: never 
 
 (10.1.1.100, 225.1.1.1) 
     Protocol: pim-dm, Flag: ACT 
     UpTime: 00:06:14 
     Upstream interface: Tunnel0 
         Upstream neighbor: 50.1.1.1 
         RPF prime neighbor: 50.1.1.1 
     Downstream interface(s) information: 
     Total number of downstreams: 1 
         1: Vlan-interface200 
             Protocol: pim-dm, UpTime: 00:04:25, Expires: never 
As shown above, Switch A is the RPF neighbor of Switch C and the multicast data from Switch A is 
delivered over a GRE tunnel to Switch C.  
Troubleshooting Multicast Routing and Forwarding  
Multicast Static Route Failure 
Symptom 
No dynamic routing protocol is enabled on the routers, and the physic status and link layer status of 
interfaces are both up, but the multicast static route fails. 
Analysis 
z 
If the multicast static route is not configured or updated correctly to match the current network 
conditions, the route entry and the configuration information of multicast static routes do not exist in 
the multicast routing table. 
z 
If a better route is found, the multicast static route may also fail. 
Solution 
1)  In the configuration, you can use the display multicast routing-table static config command to 
view the detailed configuration information of multicast static routes to verify that the multicast 
static route has been correctly configured and the route entry exists. 
2)  In the configuration, you can use the display multicast routing-table static command to view the 
information of multicast static routes to verify that the multicast static route has been correctly 
configured and the route entry exists in the multicast routing table. 
3)  Check the next hop interface type of the multicast static route. If the interface is not a point-to-point 
interface, be sure to specify the next hop address to configure the outgoing interface when you 
configure the multicast static route. 
4)  Check that the multicast static route matches the specified routing protocol. If a protocol was 
specified in multicast static route configuration, enter the display ip routing-table command to 
check if an identical route was added by the protocol. 
5)  Check that the multicast static route matches the specified routing policy. If a routing policy was 
specified when the multicast static route was configured, enter the display route-policy command 
to check the configured routing policy.