Refer to the exhibit.
Which statement is true?
A.
The command ip multicast rpf multitopology is missing from the configuration.
B.
Multitopology routing for multicast has been enabled for IS-IS.
C.
This output is invalid.
D.
The command mpls traffic-eng multicast-intact is configured on this router.
Explanation:
The following is sample output from the show ip rpf command in a Multi-Topology Routing (MTR)
routing environment. In Cisco IOS releases that support MTR, the “RPF topology” field was
introduced to indicate which RIB topology is being used for the RPF lookup. For the “RPF
topology” field in this example, the first topology listed (ipv4 multicast base) indicates where the
nexthop of the RPF lookup is being conducted and the second topology listed (ipv4 unicast data)
indicates where the route originated from.
Router# show ip rpf 10.30.30.32
RPF information for ? (10.30.30.32)
RPF interfacE. Ethernet1/0
RPF neighbor: ? (10.1.1.32)
RPF route/mask: 10.30.30.32/32
RPF typE. unicast (ospf 100)
Doing distance-preferred lookups across tables
RPF topology: ipv4 multicast base, originated from ipv4 unicast data
The table below describes the fields shown in the displays.
Table 15 show ip rpf Field Descriptions
Field
Description
RPF information for
Hostname and source address for which RPF information is displayed.
RPF interface
For the given source, the interface from which the router expects to receive packets.
RPF neighbor
For the given source, the neighbor from which the router expects to receive packets.
RPF route/mask
Route number and mask that matched against this source.
RPF type
Routing table from which this route was obtained, either unicast, MBGP, DVMRP, or static
mroutes.
RPF recursion count
The number of times the route is recursively resolved.
Doing distance-preferred
Whether RPF was determined based on distance or length of mask.
Using Group Based VRF Select, RPF VRF.
The RPF lookup was based on the group address and the VRF where the RPF lookup is being
performed.
Metric preference
The preference value used for selecting the unicast routing metric to the RP announced by the
designated forwarder (DF).
Metric
Unicast routing metric to the RP announced by the DF.
RPF topology
RIB topology being used for the RPF lookup, and, if originated from a different RIB topology, which
RIB topology the route originated from.
Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/command/imc-xe-3se-5700-
cr-book/imc-xe-3se-3850-cr-book_chapter_010.html
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