Usage Guidelines
Use the PIM topology table to display various entries for a given group, (*, G), (S, G), and (S, G)RPT, each with its own interface list.
PIM communicates the contents of these entries through the Multicast Routing Information Base (MRIB), which is an intermediary for communication between multicast routing protocols, such as PIM; local membership protocols, such as Internet Group Management Protocol (IGMP); and the multicast forwarding engine of the system.
The MRIB shows on which interface the data packet should be accepted and on which interfaces the data packet should be forwarded, for a given (S, G) entry. Additionally, the Multicast Forwarding Information Base (MFIB) table is used during forwarding to decide on per-packet forwarding actions.
When the multicast-only fast reroute (MoFRR) feature is enabled, the show pim topology detail command shows the primary and secondary paths for SGs configured for MoFRR.
Note |
For forwarding information, use the show mfib route and show mrib route commands.
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Examples
The following is sample output from the show pim topology detail command, showing the RPF table information for each topology entry:
RP/0/0/CPU0:router# show pim ipv4 topology detail
IP PIM Multicast Topology Table:
Entry state: (*/S,G)[RPT/SPT] Protocol Uptime Info
Entry flags: KAT - Keep Alive Timer, AA - Assume Alive, PA - Probe Alive,
RA - Really Alive, LH - Last Hop, DSS - Don't Signal Sources,
RR - Register Received, SR - Sending Registers, E - MSDP External,
DCC - Don't Check Connected,
ME - MDT Encap, MD - MDT Decap,
MT - Crossed Data MDT threshold, MA - Data MDT group assigned
Interface state: Name, Uptime, Fwd, Info
Interface flags: LI - Local Interest, LD - Local Dissinterest,
II - Internal Interest, ID - Internal Dissinterest,
LH - Last Hop, AS - Assert, AB - Admin Boundary
(*,224.0.1.40) DM Up: 00:07:28 RP: 0.0.0.0
JP: Null(never) RPF: Null,0.0.0.0 Flags: LH DSS
RPF Table: None
GigabitEthernet0/1/0/1 00:07:28 off LI II LH
GigabitEthernet0/1/0/2 00:07:23 off LI LH
GigabitEthernet0/1/0/1.503 00:07:27 off LI LH
(11.11.11.11,232.5.0.2)SPT SSM Up: 00:07:21
JP: Join(now) RPF: GigabitEthernet0/1/0/1.203,11.23.0.20 Flags:
RPF Table: IPv4-Unicast-default
GigabitEthernet0/1/0/1.501 00:07:21 fwd LI LH
(61.61.0.10,232.5.0.3)SPT SSM Up: 00:11:57
JP: Join(now) RPF: Null,0.0.0.0 Flags:
RPF Table: None (Dropped due to route-policy)
No interfaces in immediate olist
IP PIM Multicast Topology Table:
Entry state: (*/S,G)[RPT/SPT] Protocol Uptime Info
Entry flags: KAT - Keep Alive Timer, AA - Assume Alive, PA - Probe Alive,
RA - Really Alive, LH - Last Hop, DSS - Don't Signal Sources,
RR - Register Received, SR - Sending Registers, E - MSDP External,
DCC - Don't Check Connected,
ME - MDT Encap, MD - MDT Decap,
MT - Crossed Data MDT threshold, MA - Data MDT group assigned
Interface state: Name, Uptime, Fwd, Info
Interface flags: LI - Local Interest, LD - Local Dissinterest,
II - Internal Interest, ID - Internal Dissinterest,
LH - Last Hop, AS - Assert, AB - Admin Boundary
(*,226.1.1.1) SM Up: 09:45:45 RP: 6.6.6.11
JP: Join(now) RPF VRF: vpn1 Flags: EX LH DSS
RPF Table: IPv4-Unicast-default (Extranet by route-policy)
GigabitEthernet0/3/0/9.12 09:45:45 fwd LI LH
GigabitEthernet0/3/0/3.12 09:45:45 fwd LI LH
Note |
The RPF table output in boldface indicates that the route is extraneted due to RPL policies.
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The following example shows output for a MoFRR convergence:
RP/0/0/CPU0:router# show pim topology 239.1.1.1 detail
IP PIM Multicast Topology Table
Entry state: (*/S,G)[RPT/SPT] Protocol Uptime Info
Entry flags: KAT - Keep Alive Timer, AA - Assume Alive, PA - Probe Alive,
RA - Really Alive, LH - Last Hop, DSS - Don't Signal Sources,
RR - Register Received, SR - Sending Registers, E - MSDP External,
DCC - Don't Check Connected,
ME - MDT Encap, MD - MDT Decap,
MT - Crossed Data MDT threshold, MA - Data MDT group assigned
Interface state: Name, Uptime, Fwd, Info
Interface flags: LI - Local Interest, LD - Local Dissinterest,
II - Internal Interest, ID - Internal Dissinterest,
LH - Last Hop, AS - Assert, AB - Admin Boundary
(192.1.1.2,239.1.1.1)SPT SSM Up: 13:54:06
JP: Join(00:00:41) RPF: GigabitEthernet0/5/0/3.3,100.100.0.10 MoFRR RIB, Flags:
GigabitEthernet0/5/0/1 13:54:06 fwd LI LH
RP/0/4/CPU0:Sunnyvale#show pim topology 239.1.1.1 detail
IP PIM Multicast Topology Table
Entry state: (*/S,G)[RPT/SPT] Protocol Uptime Info
Entry flags: KAT - Keep Alive Timer, AA - Assume Alive, PA - Probe Alive,
RA - Really Alive, LH - Last Hop, DSS - Don't Signal Sources,
RR - Register Received, SR - Sending Registers, E - MSDP External,
DCC - Don't Check Connected,
ME - MDT Encap, MD - MDT Decap,
MT - Crossed Data MDT threshold, MA - Data MDT group assigned
Interface state: Name, Uptime, Fwd, Info
Interface flags: LI - Local Interest, LD - Local Dissinterest,
II - Internal Interest, ID - Internal Dissinterest,
LH - Last Hop, AS - Assert, AB - Admin Boundary
(192.1.1.2,239.1.1.1)SPT SSM Up: 13:54:10
JP: Join(00:00:37) RPF: GigabitEthernet0/5/0/3.3,100.100.0.10 MoFRR RIB, Flags:
RPF Table: IPv4-Unicast-default
RPF Secondary: GigabitEthernet0/5/0/3.2,100.100.200.10
GigabitEthernet0/5/0/1 13:54:10 fwd LI LH
Table 1 describes the significant fields shown in the display . This table includes fields that do not appear in the example, but that may appear in your output.