Refer to the exhibit. What is the effect of this configuration?

Question

Exhibit

Options

• AThe mroute table is cleared.
• BRouter 1 accepts multicast routes with a tag of 12:1
• CA Cisco MPLS TE tunnel is generated with 192.168.1.2 as the source IP address of router 1.
• DAn LSP virtual interface tunnel is created.

• A
  8% (4)
• B
  75% (38)
• C
  4% (2)
• D
  14% (7)

Explanation

Option B is correct because the exhibited configuration uses a route-map with a match tag statement referencing tag 12:1, which acts as a filter controlling which multicast routes Router 1 will accept - only those carrying that specific tag value pass the permit condition and populate the multicast routing table.

Why the distractors are wrong:

• A is wrong because clearing the mroute table requires an active clear ip mroute command, not a passive route-map or tag configuration.
• C is wrong because generating an MPLS TE tunnel requires tunnel mode mpls traffic-eng along with RSVP and TE-specific commands - a multicast tag match does none of that.
• D is wrong because LSP virtual interfaces are MPLS constructs built through LDP/RSVP label exchange, which is entirely unrelated to multicast route filtering via tags.

Memory tip: Think of the tag as a wristband at a venue door - the route-map is the bouncer who only lets in guests (routes) wearing wristband 12:1. Tags filter; they don't build tunnels or wipe tables.

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