Troubleshooting Multicast Routing And Forwarding; Multicast Static Route Failure; Multicast Data Fails To Reach Receivers - HP 4800G Series Configuration Manual

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
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.
If the optimal 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.

Multicast Data Fails to Reach Receivers

Symptom
The multicast data can reach some routers but fails to reach the last hop router.
Analysis
If a multicast forwarding boundary has been configured through the multicast boundary command,
any multicast packet will be kept from crossing the boundary.
Solution
1) Use the display pim routing-table command to check whether the corresponding (S, G) entries
exist on the router. If so, the router has received the multicast data; otherwise, the router has not
received the data.
2) Use the display multicast boundary command to view the multicast boundary information on the
interfaces. Use the multicast boundary command to change the multicast forwarding boundary
setting.
1-15