Requirements for Interdomain Multicast Routing

AE.

Interdomain multicast routing refers to the ability of different service providers (ISPs) to share multicast traffic between their respective multicast administrative domains. Before separate ISPs can provide interdomain multicast routing, there are certain conditions that must be met. Let's look at each of the options given and determine which ones are correct:

A. Each ISP must configure MSDP to connect its individual multicast administrative domain to the domains at other ISPs. MSDP (Multicast Source Discovery Protocol) is a protocol that enables interdomain multicast routing by allowing different domains to exchange information about active multicast sources. This information is used by the receiving domain to build a multicast distribution tree. Therefore, this option is correct as it is necessary for each ISP to configure MSDP to connect its individual multicast administrative domain to the domains at other ISPs to enable interdomain multicast routing.

B. Each ISP must dedicate a single router to handle multicast traffic between providers. This option is incorrect. There is no requirement for each ISP to dedicate a single router to handle multicast traffic between providers for interdomain multicast routing. It is possible to use multiple routers to handle multicast traffic between providers.

C. Each ISP must replace its RP assignment with a global RP. This option is incorrect. There is no need for each ISP to replace its RP (Rendezvous Point) assignment with a global RP for interdomain multicast routing. RP is used to build the multicast distribution tree within a domain and is not related to interdomain multicast routing.

D. Each ISP must configure its network to use PIM-DM. This option is incorrect. PIM-DM (Protocol Independent Multicast-Dense Mode) is a multicast routing protocol used to flood multicast traffic across the network. However, PIM-DM is not a requirement for interdomain multicast routing. Other multicast routing protocols such as PIM-SM (Protocol Independent Multicast-Sparse Mode) can also be used for interdomain multicast routing.

E. Each ISP must support intradomain multicast routing. This option is correct. Intradomain multicast routing refers to the ability of a single ISP to route multicast traffic within its own multicast administrative domain. Before interdomain multicast routing can be enabled, each ISP must ensure that it supports intradomain multicast routing to handle multicast traffic within its own domain.

Therefore, the correct answers are A and E.