Dell PowerConnect B-RX Configuration Manual page 676

23
Anycast RP
This feature uses functionality that is already available on the device Router but re-purposes it to
provide the benefits desired as described in RFC 3446.
Configuring anycast RP
To configure Anycast RP, you must do the following:
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Example
The example shown in
PIM-SM routers. Loopback 1 in RP 1 and RP 2 have the same IP address. Loopback 2 in RP1 and
Loopback 2 in RP2 have different IP addresses and are configured as MSDP peering IP addresses
in a mesh configuration.
In the PIM configuration for PIM-SM routers PIMR1 and PIMR2 the RP address is configured to be
the anycast RP address that was configured on the Loopback 1 interfaces on RP1 and RP2. OSPF
is configured as the IGP for the network and all of the devices are in OSPF area 0.
Since PIMR1 has a lower cost path to RP1 and PIMR2 has a lower cost path to RP2 they will
register with the respective RPs when both are up and running. This shares the load between the
two RPs. If one of the RPs fails, the higher-cost path to the IP address of Loopback 1 on the RPs is
used to route to the still-active RP.
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Configure a loopback interface with the anycast RP address on each of the RPs within the
domain and enable PIM-SM on these interfaces.
Ensure that the anycast RP address is leaked into the IGP domain. This is typically done by
enabling the IGP on the loopback interface (in passive mode) or redistributing the connected
loopback IP address into the IGP.
NOTE
The anycast RP address *must* not be the IGP router-id.
Enable PIM-SM on all interfaces on which multicast routing is desired.
Enable an IGP on each of the loopback interfaces and physical interfaces configured for
PIM-SM.
Configure loopback interfaces with unique IP addresses on each of the RPs for MSDP peering.
This loopback interface is also used as the MSDP originator-id.
The non-RP PIM-SM routers may be configured to use the anycast RP address statically or
dynamically (by the PIMv2 bootstrap mechanism).
Figure 92 is a simple Anycast-enabled network with two RPs and two
BigIron RX Series Configuration Guide
53-1001810-01