300-360 · Question #86
After enabling global multicast, multicast traffic has been flooding the wired and wireless network. The wireless engineer has been troubleshooting and is attempting to find the source of the…
The correct answer is A. show ip mroute. The show ip mroute command displays the IP multicast routing table on a Cisco router or Layer 3 switch. Each entry shows the multicast source address (S), the group address (G), the RPF (Reverse Path Forwarding) incoming interface - which is the interface toward the traffic…
Question
After enabling global multicast, multicast traffic has been flooding the wired and wireless network. The wireless engineer has been troubleshooting and is attempting to find the source of the traffic. What command will display the multicast traffic source as well as the incoming interface?
Options
- Ashow ip mroute
- Bshow ip igmp groups
- Cshow ip pim neighbor
- Dshow ip device tracking all
How the community answered
(35 responses)- A86% (30)
- B9% (3)
- C3% (1)
- D3% (1)
Explanation
The show ip mroute command displays the IP multicast routing table on a Cisco router or Layer 3 switch. Each entry shows the multicast source address (S), the group address (G), the RPF (Reverse Path Forwarding) incoming interface - which is the interface toward the traffic source - and the outgoing interface list. This allows the engineer to trace exactly which source is generating the flood and on which interface it is arriving. show ip igmp groups (B) shows group membership but not source addresses or incoming interfaces. show ip pim neighbor (C) shows PIM adjacencies, not active multicast flows. show ip device tracking all (D) is a host-tracking command unrelated to multicast routing.
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