Troubleshooting Multicast Routing And Forwarding; Configuration - 3Com Switch 4800G 24-Port Configuration Manual

Switch 4800g family 24-port, pwr 24-port, 48-port, pwr 48-port, 24-port sfp

Hide thumbs Also See for Switch 4800G 24-Port:

Product manual (13 pages)

Datasheet (8 pages)

Configuration manual (27 pages)

Table of Contents

Troubleshooting

Multicast Routing and

Multicast Static Route

[SwitchC-Vlan-interface300] pim dm

[SwitchC-Vlan-interface300] quit

[SwitchC] interface vlan-interface 102

[SwitchC-Vlan-interface102] pim dm

[SwitchC-Vlan-interface102] quit

The configuration on Switch B is similar to that on Switch A. The specific

configuration steps are omitted here.

# Use the display multicast rpf-info command to view the RPF routes to Source

2 on Switch B and Switch C.

[SwitchB] display multicast rpf-info 50.1.1.100

[SwitchC] display multicast rpf-info 50.1.1.100

No information is displayed. This means that no RPF route to Source 2 exists on

Switch B and Switch C.

3 Configure a multicast static route

# Configure a multicast static route on Switch B, specifying Switch A as its RPF

neighbor on the route to Source 2.

[SwitchB] ip rpf-route-static 50.1.1.100 24 30.1.1.2

# Configure a multicast static route on Switch C, specifying Switch B as its RPF

neighbor on the route to Source 2.

[SwitchC] ip rpf-route-static 50.1.1.100 24 20.1.1.2

4 Verify the configuration

# Use the display multicast rpf-info command to view the RPF routes to Source

2 on Switch B and Switch C.

[SwitchB] display multicast rpf-info 50.1.1.100

RPF information about source 50.1.1.100:

RPF interface: Vlan-interface102, 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

[SwitchC] display multicast rpf-info 50.1.1.100

RPF information about source 50.1.1.100:

RPF interface: Vlan-interface101, 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 Switch B and Switch C. The

source is the configured static route.

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.