2 Comments on “Which two statements about the device that generated the output are true?”

1. Snoopy says:

   November 14, 2015 at 4:02 pm

   Explanation: In this example we can see that the s, T, and I flags are set. Here is a list of the
   flags and their meanings:
   show ip mroute Field Descriptions
   Field
   Description
   Flags:
   Provides information about the entry.
   D – Dense
   Entry is operating in dense mode.
   S – Sparse
   Entry is operating in sparse mode.
   B – Bidir Group
   Indicates that a multicast group is operating in bidirectional mode.
   s – SSM Group
   Indicates that a multicast group is within the SSM range of IP addresses. This flag is reset if
   the SSM range changes.
   C – Connected
   A member of the multicast group is present on the directly connected interface.
   L – Local
   The router itself is a member of the multicast group.
   P – Pruned
   Route has been pruned. The Cisco IOS software keeps this information so that a downstream
   member can join the source.
   R – RP-bit set
   Indicates that the (S, G) entry is pointing toward the RP. This is typically prune state along the
   shared tree for a particular source.
   F – Register flag
   Indicates that the software is registering for a multicast source.
   T – SPT-bit set
   Indicates that packets have been received on the shortest path source tree.
   J – Join SPT
   For (*, G) entries, indicates that the rate of traffic flowing down the shared tree is exceeding the
   SPT-Threshold set for the group. (The default SPT-Threshold setting is 0 kbps.) When the J- Join
   shortest path tree (SPT) flag is set, the next (S, G) packet received down the shared tree triggers
   an (S, G) join in the direction of the source, thereby causing the router to join the source tree.
   For (S, G) entries, indicates that the entry was created because the SPT-Threshold for the group
   was exceeded. When the J- Join SPT flag is set for (S, G) entries, the router monitors the traffic
   rate on the source tree and attempts to switch back to the shared tree for this source if the traffic
   rate on the source tree falls below the SPT-Threshold of the group for more than 1 minute.
   M – MSDP created entry
   Indicates that a (*, G) entry was learned through a Multicast Source Discovery Protocol (MSDP)
   peer. This flag is only applicable for a rendezvous point (RP) running MSDP.
   X – Proxy Join Timer Running
   Indicates that the proxy join timer is running. This flag is only set for (S, G) entries of an RP or
   “turnaround” router. A “turnaround” router is located at the intersection of a shared path (*, G) tree
   and the shortest path from the source to the RP.
   A – Advertised via MSDP
   Indicates that an (S, G) entry was advertised through an MSDP peer. This flag is only applicable
   for an RP running MSDP.
   U – URD
   Indicates that a URD channel subscription report was received for the (S, G) entry.
   I – Received Source Specific Host Report
   Indicates that an (S, G) entry was created by an (S, G) report. This (S, G) report could have
   been created by IGMPv3, URD, or IGMP v3lite. This flag is only set on the designated router
   (DR).
   Reference. http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature

   
   
   
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2. Fe says:

   July 11, 2016 at 7:18 pm

   Router# show ip mroute

   IP Multicast Routing Table

   Flags: D – Dense, S – Sparse, B – Bidir Group, s – SSM Group, C – Connected,

   L – Local, P – Pruned, R – RP-bit set, F – Register flag,

   T – SPT-bit set, J – Join SPT, M – MSDP created entry,

   X – Proxy Join Timer Running, A – Candidate for MSDP Advertisement,

   U – URD, I – Received Source Specific Host Report, Z – Multicast Tunnel,

   Y – Joined MDT-data group, y – Sending to MDT-data group

   Timers: Uptime/Expires

   Interface state: Interface, Next-Hop, State/Mode

   
   
   
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