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300-515 · Question #75

Refer to the exhibit. Which statement about this configuration is true?

The correct answer is A. Router 1 will accept multicast routes with a route-target of 12:1. Option A is correct because in MVPN configurations, import route-targets determine which BGP multicast routes a router will accept into its MVRF - the exhibit's configuration shows an import route-target of 12:1, meaning Router 1 will accept any multicast route tagged with that…

Multicast VPN

Question

Refer to the exhibit. Which statement about this configuration is true?

Exhibit

300-515 question #75 exhibit

Options

  • ARouter 1 will accept multicast routes with a route-target of 12:1.
  • B192.168.1.2 must be reachable by all routers participating in the mvpn-intranet MVRF.
  • CRouter 1 has statically defined thresholds for data MDT.
  • DThe MVRF must be configured on each router on the customer and service provider networks.

How the community answered

(31 responses)
  • A
    52% (16)
  • B
    13% (4)
  • C
    29% (9)
  • D
    6% (2)

Explanation

Option A is correct because in MVPN configurations, import route-targets determine which BGP multicast routes a router will accept into its MVRF - the exhibit's configuration shows an import route-target of 12:1, meaning Router 1 will accept any multicast route tagged with that value, just as with standard L3VPN BGP route-target logic.

Option B is wrong because the address referenced (192.168.1.2) is typically the default MDT group address, and only PE routers - not all routers on every participating network - need reachability to it; customer-side routers are unaffected.

Option C is incorrect because data MDT thresholds are configured explicitly with the mdt data command followed by a threshold value; if the exhibit shows only a default MDT statement without that command, no static data MDT thresholds are defined - the router uses defaults.

Option D is wrong because MVRF is only required on PE (Provider Edge) routers, not on every CE (customer) or P (core provider) router; those routers participate in the underlay or handle standard routing without needing VRF-aware multicast configuration.

Memory tip: Think of route-targets in MVPN exactly like regular L3VPN - import = accept inbound, export = advertise outbound. If you see an import RT in the config, that router accepts routes carrying that tag.

Topics

#MVPN#Route-Targets#MVRF#Multicast Filtering

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