Troubleshooting Multicast Routing And Forwarding; Multicast Static Route Failure - 3Com MSR 50 Series Configuration Manual

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HAPTER ULTICAST
Troubleshooting
Multicast Routing and
Forwarding
Multicast Static Route
Failure
R F C
OUTING AND ORWARDING
[RouterB] display multicast rpf-info 50.1.1.100
RPF information about source 50.1.1.100:
RPF interface: Ethernet1/2, RPF neighbor: 30.1.1.2
Referenced route/mask: 50.1.1.0/24
Referenced route type: multicast static
Route selection rule: preference-preferred
Load splitting rule: disable
[RouterC] display multicast rpf-info 50.1.1.100
RPF information about source 50.1.1.100:
RPF interface: Ethernet1/1, RPF neighbor: 20.1.1.2
Referenced route/mask: 50.1.1.0/24
Referenced route type: multicast static
Route selection rule: preference-preferred
Load splitting rule: disable
As shown above, the RPF routes to Source 2 exist on Router B and Router C. The
source is the configured static route.
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
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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.
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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 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.
ONFIGURATION