Configuring Pim Stub Routing; Pim Stub Routing Configuration Guidelines - Cisco Catalyst 3120 Software Manual

Configuring IP Multicast Routing
Command
Step 5 ip pim {dense-mode | sparse-mode |
sparse-dense-mode}
Step 6
end
Step 7
show running-config
Step 8
copy running-config startup-config
To disable multicasting, use the no ip multicast-routing distributed global configuration command. To
return to the default PIM version, use the no ip pim version interface configuration command. To
disable PIM on an interface, use the no ip pim interface configuration command.

Configuring PIM Stub Routing

The PIM Stub routing feature supports multicast routing between the distribution layer and the access
layer. It supports two types of PIM interfaces, uplink PIM interfaces, and PIM passive interfaces. A
routed interface configured with the PIM passive mode does not pass or forward PIM control traffic, it
only passes and forwards IGMP traffic.

PIM Stub Routing Configuration Guidelines

Follow these guidelines when enabling PIM stub routing on an interface:
•
•
•
•
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
44-14
Purpose
Enable a PIM mode on the interface.
By default, no mode is configured.
The keywords have these meanings:
Note
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Before configuring PIM stub routing, you must have IP multicast routing configured on both the stub
router and the central router. You must also have PIM mode (dense-mode, sparse-mode, or
dense-sparse-mode) configured on the uplink interface of the stub router.
The PIM stub router does not route the transit traffic between the distribution routers. Unicast
(EIGRP) stub routing enforces this behavior. You must configure unicast stub routing to assist the
PIM stub router behavior. For more information, see the
page 38-43.
Only directly connected multicast (IGMP) receivers and sources are allowed in the Layer 2 access
domains. The PIM protocol is not supported in access domains.
The redundant PIM stub router topology is not supported.
• dense-mode—Enables dense mode of operation.
sparse-mode—Enables sparse mode of operation. If you configure
•
sparse mode, you must also configure an RP. For more information,
see the "Configuring a Rendezvous Point" section on page
• sparse-dense-mode—Causes the interface to be treated in the mode
in which the group belongs. Sparse-dense mode is the recommended
setting.
After you enable a PIM mode on the interface, the ip
mroute-cache distributed interface configuration command is
automatically entered for the interface and appears in the running
configuration.
Chapter 44 Configuring IP Multicast Routing
"EIGRP Stub Routing" section on
44-16.
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