You are asked to configure PIM-SM in your network. Your implementation must allow for load sharing betweenredundant RPs and, should an RP failure occur, the RP failover time should be minimized.
Which two configuration tasks are required in this scenario? (Choose two.)
A.
Configure MSDP peering sessions between the routers designated as RPs.
B.
Configure at least two static RPs and bundle them in an RP redundancy group under [edit protocols pim].
C.
On the routers designated as RPs, configure the shared anycast address on the loopback inteface.
D.
Configure the shared anycast address on the RPs as the primary address on the loopback interface.
Explanation:
For the purposes of load balancing and redundancy, you can configure anycast RP. You can use anycast RP
within a domain to provide redundancy and RP load sharing.
Anycast means that multiple RP routers share the same unicast IP address.
D: On each RP router in the domain, make sure that the router’s regular loopback address is the primary
address for the interface, and set the router ID.
B: On each non-RP router in the domain, configure a static RP address using the shared address.
Example:
[edit protocols pim]
user@host# set rp static address 10.1.1.2
http://www.juniper.net/techpubs/en_US/junos14.1/topics/topic-map/mcast-pim-anycast-rp.html
write answer is A,C
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Would like to say A, D. What do you think ?
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i would say A and C
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https://www.juniper.net/documentation/en_US/junos/topics/example/multicast-pim-anycast-rp-configuring.html
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interfaces {
lo0 {
description “PIM RP”;
unit 0 {
family inet {
address 198.51.100.254/32 {
primary;
}
address 198.51.100.253/32;shared RP address
}}}}
Specify the RP address.
Include the address statement at the [edit protocols pim rp local] hierarchy level (the same address as the secondary lo0 interface).
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Anycast RP is a redundancy and load balancing mechanism applicable to the PIM-SM distribution model
RFC 2026
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Ans: A & C
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A & C is the correct answer.
There is no such things as an RP redundancy group and you cannot make the Anycast address a primary lo0 address without affecting the routers Router ID and IGP operation.
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Options A and D, final answer.
Although the anycast address can be either the primary or secondary lo0.0 loopback address.
Best practices is to use the router’s lo0.0 (primary loopback) address prefix for configuring the AMT anycast prefix in the default routing instance,
and the router’s lo0.n (secondary loopback) address prefix for configuring the AMT anycast prefix in VPN routing instances.
However, in this question, it was specific to say allow for load sharing, so options A and C fits into this requirement, so use the secondary loopback address to be able to allow for the anycast prefix to be advertised by unicast routing protocols to route AMT discovery messages to the router from nearby AMT gateways.
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