3Com 4800G Series, Configuration Manual

Page: 714 / 1246

714 C
HAPTER
49: M
ULTICAST
R
OUTING AND
F
ORWARDING
C
ONFIGURATION
Analysis
■
If the multicast static route is not configured or updated correctly to match the
current network conditions, the route entry does not exist in the multicast
route configuration table and 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.
3 In the case of PIM-SM, use the display current-configuration command to
check the BSR and RP information.