A network engineer must design an MSDP multicast solution to provide RP resilience in a network with two separate domains. Also, multicast sources and receivers must register with the local RP. Which solution must the engineer choose?
A.
Configure the RP has value to 0, and traffic will route to the closest RP
B.
Configure the RP loopback interface with the same IP address/32, and traffic will route to the closest RP
C.
Configure the RP group ranges to split the multicast traffic, and traffic will route to the longest match
D.
Configure the RP priority with the same value, and traffic will route to the closest RP
Answer is B
https://techhub.hpe.com/eginfolib/networking/docs/switches/7500/5200-1936a_ip-multi_cg/content/495505225.htm#:~:text=One%20or%20more%20pairs%20of,RPs%20by%20these%20MSDP%20peers.&text=As%20shown%20in%20Figure%2057,on%20any%20PIM%2DSM%20router.
Option B is the correct answer because Anycast RP is a technique that allows multiple RPs to share the same IP address. By configuring the RP loopback interface with the same IP address/32 in both domains, multicast traffic can be forwarded to the closest RP in each domain. This allows for RP redundancy and load sharing, ensuring that multicast traffic continues to flow even if one of the RPs fails.
Both can be true and correct because if you check the link:
https://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/115011-anycast-pim.html
Relevant running configurations
Nexus 1 relevant configuration:
ip pim rp-address 10.1.1.1 group-list 224.0.0.0/4
ip pim anycast-rp 10.1.1.1 192.168.1.1
ip pim anycast-rp 10.1.1.1 192.168.2.2
interface loopback1
ip address 192.168.1.1/32
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface loopback7
ip address 10.1.1.1/32
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface Ethernet9/2
ip address 10.7.7.1/24
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface Ethernet9/3
ip address 172.16.1.2/24
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
Nexus 2 relevant configuration:
ip pim rp-address 10.1.1.1 group-list 224.0.0.0/4
ip pim ssm range 232.0.0.0/8
ip pim anycast-rp 10.1.1.1 192.168.1.1
ip pim anycast-rp 10.1.1.1 192.168.2.2
interface loopback1
ip address 192.168.2.2/32
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface loopback7
ip address 10.1.1.1/32
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
interface Ethernet9/2
ip address 10.7.7.2/24
ip router ospf 1 area 0.0.0.0
ip pim sparse-mode
-----------------------------
This is exactly what we need here:
ip pim anycast-rp 10.1.1.1 192.168.1.1
ip pim anycast-rp 10.1.1.1 192.168.2.2
(10.1.1.1 is the "loopback 7" for both of the devices -> Which is the same -> Question 174)
(192.168.1.1 / 192.168.2.2 is their "Loopback 1" which should be a diverse loopback address for each RP -> Question 181)
I think D
Two or more RPs are configured with the same IP address (for example, 10.0.0.1) on loopback interfaces. The loopback address should be configured with a 32-bit mask. All the downstream routers are configured so that they know that 10.0.0.1 is the IP address of their local RP. IP routing automatically selects the topologically closest RP for each source and receiver.
https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/Phase_1/mcstmsdp/mcst_p1.html
This section is not available anymore. Please use the main Exam Page.300-420 Exam Questions
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
LSLS55
7 months, 2 weeks agoClauster
10 months, 3 weeks agoSpicyMochi
1 year, 1 month agoandrewChan
1 year, 7 months agoSickcnt
1 year, 8 months agoSickcnt
1 year, 8 months agoHope66
1 year, 8 months agoEards
1 year, 8 months agoReinier_veen
1 year, 8 months agoHope66
1 year, 8 months agoEards
1 year, 8 months ago