C
HAPTER
46
| Multicast Routing Commands
PIM Multicast Routing
– 1104 –
ip pim rp-address This command sets a static address for the Rendezvous Point (RP) for a
particular multicast group. Use the no form to remove an RP address or an
RP address for a specific group.
SYNTAX
[no] ip pim rp-address rp-address [group-prefix group-address
mask]
rp-address - Static IP address of the router that will be an RP for the
specified multicast group(s).
group-address - An IP multicast group address. If a group address
is not specified, the RP is used for all multicast groups.
mask - Subnet mask that is used for the group address.
DEFAULT SETTING
None
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† The router will act as an RP for all multicast groups in the local PIM-SM
domain if no groups are specified. A static RP can either be configured
for the whole multicast group range 224.0.0.0/4, or for specific group
ranges.
â—† Using this command to configure multiple static RPs with the same RP
address is not allowed. If an IP address is specified that was previously
used for an RP, then the older entry is replaced.
â—† Multiple RPs can be defined for different groups or group ranges. If a
group is matched by more than one entry, the router will use the RP
associated with the longer group prefix length. If the prefix lengths are
the same, then the static RP with the highest IP address is chosen.
â—† Static definitions for RP addresses may be used together with RP
addresses dynamically learned through the bootstrap router (BSR). If
an RP address learned by the BSR and one statically configured using
this command are both available for a group range, the RP address
learned by the BSR is chosen over the one statically configured.
â—† All routers within the same PIM-SM domain must be configured with the
same RP(s). Selecting an RP through the dynamic election process is
therefore preferable for most situations. Using the dynamic RP election
process also allows a backup RP to automatically take over if the active
RP router becomes unavailable.
â—† If the no form of this command is used without specifying a multicast
group, the default 224.0.0.0 (with the mask 240.0.0.0) is removed. In
other words, all multicast groups are removed.
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