Dell S4820T, Configuration Manual

Page: 745 / 1178

Example of Viewing an RP on a Loopback Interface
Dell#sh run int loop0
!
interface Loopback 0
ip address 1.1.1.1/32
ip pim sparse-mode
no shutdown
Dell#sh run pim
!
ip pim rp-address 1.1.1.1 group-address 224.0.0.0/4
Overriding Bootstrap Router Updates
PIM-SM routers must know the address of the RP for each group for which they have (*,G) entry.
This address is obtained automatically through the bootstrap router (BSR) mechanism or a static RP
configuration.
Use the following command if you have configured a static RP for a group. If you do not use the
override
option with the following command, the RPs advertised in the BSR updates take precedence
over any statically configured RPs.
• Use the
override
option to override bootstrap router updates with your static RP configuration.
ip pim rp-address
Examples of Viewing the Rendezvous Point (Multicast Group) Information
To display the assigned RP for a group, use the
show ip pim rp
command from EXEC privilege mode.
Dell#show ip pim rp
Group RP
225.0.1.40 165.87.50.5
226.1.1.1 165.87.50.5
To display the assigned RP for a group range (group-to-RP mapping), use the
show ip pim rp
mapping
command in EXEC privilege mode.
Dell#show ip pim rp mapping
PIM Group-to-RP Mappings
Group(s): 224.0.0.0/4, Static
RP: 165.87.50.5, v2
Configuring a Designated Router
Multiple PIM-SM routers might be connected to a single local area network (LAN) segment. One of these
routers is elected to act on behalf of directly connected hosts. This router is the designated router (DR).
The DR is elected using hello messages. Each PIM router learns about its neighbors by periodically
sending a hello message out of each PIM-enabled interface. Hello messages contain the IP address of the
interface out of which it is sent and a DR priority value. The router with the greatest priority value is the
DR. If the priority value is the same for two routers, then the router with the greatest IP address is the DR.
By default, the DR priority value is 192, so the IP address determines the DR.
• Assign a DR priority value.
INTERFACE mode
ip pim dr-priority priority-value
PIM Sparse-Mode (PIM-SM)
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