R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

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Troubleshooting multicast routing and forwarding
Static multicast route failure
Symptom
No dynamic routing protocol is enabled on the routers, and the physical status and link layer status of
interfaces are both up, but the static multicast route fails.
Analysis
• If a static multicast route is not correctly configured or updated to match the current network
conditions, it does not exist in the static multicast routing table.
• If a better route is found, the static multicast route might also fail.
Solution
1. Use the display multicast routing-table static command to display information about static
multicast routes to verify that the static multicast route has been correctly configured and the route
entry exists in the static multicast routing table.
2. Check the type of the interface that connects the static multicast route to the RPF neighbor. If the
interface is not a point-to-point interface, be sure to specify the address for the RPF neighbor.
Multicast data fails to reach receivers
Symptom
No multicast packets can cross a multicast boundary set with the multicast boundary command.
Analysis
If you have configured a multicast forwarding boundary by using the multicast boundary command, any
multicast packet will be kept from crossing the boundary.
Solution
1. Use the display pim routing-table command to verify that the corresponding (S, G) entries exist on
each router. If so, routers have received the multicast data. Otherwise, routers have not received
the data.
2. Use the display multicast boundary command to display multicast boundary information on the
interfaces. Use the multicast boundary command to change the multicast forwarding boundary
setting.
3. If the multicast data travels in PIM-SM network, use the display current-configuration command to
check BSR and RP information.