<GLOBAL>
This command is used to display relevant multicast information from the target multicast router. Information displayed includes adjacency information, protocol, metrics, thresholds, and flags from the target multicast router. This information can be used by network operators to determine whether bi-directional adjacencies exist.
Label | Description |
General flags | |
version | Indicates software version on queried router. |
prune | Indicates that router understands pruning. |
genid | Indicates that router sends generation IDs. |
mtrace | Indicates that the router handles mtrace requests. |
Neighbors flags | |
1 | Metric |
0 | Threshold (multicast time-to-live) |
pim | PIM enabled on interface. |
down | Operational status of interface. |
disabled | Administrative status of interface. |
leaf | No downstream neighbors on interface. |
querier | Interface is IGMP querier. |
tunnel | Neighbor reached via tunnel. |
This command traces a multicast path from a source to a receiver and displays multicast packet rate and loss information. The mstat command adds the capability to show the multicast path in a limited graphic display and provide drops, duplicates, TTLs, and delays at each node. This information is useful to network operators because it identifies nodes with high drop and duplicate counts. Duplicate counts are shown as negative drops.
Label | Description |
hop | Number of hops from the source to the listed router. |
router name | Name of the router for this hop or “?” when not reverse DNS translated. |
address | Address of the router for this hop. |
protocol | Protocol used. |
ttl | Forward TTL threshold. TTL that a packet is required to have before it will be forwarded over the outgoing interface. |
forwarding code | Forwarding information/error code for this hop. |
For each interface between 2 nodes a line is printed, following the same layout as other routers with an implementation derived from mrouted. Consider the following:
This command traces the multicast path from a source to a receiver by passing a trace query hop-by-hop along the reverse path from the receiver to the source. At each hop, information such as the hop address, routing error conditions, and packet statistics are gathered and returned to the requester. A network administrator can determine where multicast flows stop and verify the flow of the multicast stream.
Label | Description |
hop | Number of hops from the source to the listed router. |
router name | Name of the router for this hop. If a DNS name query is not successful a “?” displays. |
address | Address of the router for this hop. |
protocol | Protocol used. |
ttl | Forward TTL threshold. TTL that a packet is required to have before it will be forwarded over the outgoing interface. |
forwarding code | Forwarding information/error code for this hop. |