3Com Switch 8800 Advanced Software V5 Configuration Guide

514 CHAPTER 38: MULTICAST ROUTING AND FORWARDING CONFIGURATION
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 a
VLAN interface, you can specify an RPF neighbor only by providing its IP address
(rpf-nbr-address) rather than an interface type and interface number
(interface-type interface-number).
4 Check that the multicast static route matches the specified routing protocol. If a
protocol was specified when the multicast static route was configured, 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 intermediate devices but fails to reach the last
hop device.
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 device. If so, the device has received the
multicast data; otherwise, the device 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.
3 In the case of PIM-SM, use the display current-configuration command to
check the BSR and RP information.