What is correct regarding the operation of VSX and multicasting with PIM-SM routing configured?
What is correct regarding the operation of VSX and multicasting with PIM-SM routing configured?
In a VSX environment with PIM-SM routing, each VSX peer independently runs PIM and maintains its own group database. One of the VSX peers is elected as the designated router (DR) to forward multicast streams to a receiver VLAN. This setup ensures that multicast traffic is forwarded based on the group database of the elected DR, maintaining proper operation and avoiding potential duplication or conflicts in multicast forwarding.
C answer can be misleading though.. Each VSX peers runs PIM and builds its own group database.= correct Both VSX peers can forward multicast streams to receivers in a VLAN, = not same VLAN ! achieving load sharing = correct only if each VSX is configured as DR for different VLANs so answer A could be more correct as it is less open for misinterpretation
C is correct
In my opinion it is D... A also sounds quite good, but it is crucial that both VSX peers have and use the same multicast tables. "Both the DR and proxy DR maintain the same multicast tables and build the shortest path tree." Reference: https://www.arubanetworks.com/techdocs/AOS-CX/10.07/HTML/5200-7888/Content/Chp_Pre_tra_loss/ip-mul-rou-10.htm
I have to correct my statement, it is answer A. The IGMP Group DB is a copy, each peer has its own database
Answer D Same routing table for fast failover and one is elected DR and share traffic and the other one is DR Proxy.
i think the Answer is A. Each VSX switch has an identical IGMP group database: • Each VSX node individually learns any JOIN/LEAVE message received from a downstream VSX LAG. • The VSX IGMP process translates the received IGMP from the ISL into an IGMP join message from the VSX LAG. Multicast traffic to these IGMP groups is pruned/forwarded based on the individual IGMP group database on each VSX node. ISLP does not synchronize IGMP groups between VSX peers. The IGMP database construction is a data-plane based process. - Chapter 7, Preventing traffic loss, "ArubaOS-CX Virtual Switching Extension (VSX) Guide for 10.03"
Page 634 Study Guide: Both VSX peers have the same Control Plane information. This means that both members will be able to establish PIM neighborships, send PIM Join messages to the RP and Build a Shortest Path Tree (SPT). However, multicast traffic (data plane) is only routed from the VSX peer that acts as the PIM DR. The mechanism to have a pre- established Control Plane on both VSX peers permits the VSX cluster to achieve a fast fail over in case the PIM DR fails. [Aruba Networks]
In stufy book we can see that on peer stands as DR. meanst its A or D. I perefered A
As the question stands A is correct. As Mrvn says, each VSX peer can be the DR for a VLAN, but not both at the same time.
it should be A
"both VSX switches as a PIM Designate Router (DR). One node is the actual DR, the other node is the proxy DR." "Only the actual DR performs multicast routing and forward traffic destined to groups to its downstream VLANs in the data-path." https://www.arubanetworks.com/techdocs/AOS-CX/10.07/HTML/5200-7888/Content/Chp_Pre_tra_loss/ip-mul-rou-10.htm
As the question stands A is correct.
Answer is A: Multicast traffic to these IGMP groups is pruned/forwarded based on the individual IGMP group database on each VSX node. ISLP does not synchronize IGMP groups between VSX peers. Source: https://www.arubanetworks.com/techdocs/AOS-CX/10.06/HTML/5200-7727/Content/Chp_prev_traf_loss/igm-sno-10.htm
The answer should be A
Yes: it should be A.
The correct Answer is A
A: Multicast Traffic Flow: In a VSX environment with PIM-SM, multicast traffic is forwarded based on the multicast distribution tree established by PIM-SM. Each physical switch in the VSX pair independently participates in the PIM-SM operations, including joining the appropriate multicast distribution tree and forwarding multicast traffic accordingly. VSX and Multicast: When operating VSX and using PIM-SM routing, each physical switch within the VSX pair independently runs PIM-SM. This means that each switch has its own RP and maintains its own multicast routing tables.
A: In Aruba VSX (Virtual Switching Extension), the VSX peers do not run PIM (Protocol Independent Multicast) individually and maintain their own multicast group databases.