Syntax:
Without parameters, lists multicast route entries in the following situations:
When the PIM-DM router is actively forwarding a multicast flow out an interface (VLAN.)
On a PIM-DM originator router (source directly connected) when traffic is entering the router but not forwarding
NOTE: The neighbor field will be empty in this case.
On a PIM-DM Non-originator router for a short duration after a flow's initial flood/prune cycle is seen. This entry is cleared after 5 minutes unless the flow is connected within that time period.
Showing the route entry data on the “#2” routing switch
The next figure displays the
show ip mrouteoutput on the “8212zl #2” routing switch shown in Multicast network with a multinetted VLAN. This case illustrates two multicast groups from the same multicast source.HP Switch(config)# show ip mroute IP Multicast Route Entries Total number of entries : 2 Group Address Source Address Neighbor VLAN --------------- --------------- --------------- ---- 239.255.255.1 10.27.30.2 10.29.30.1 29 239.255.255.5 10.27.30.2 10.29.30.1 29
![[NOTE: ]](images/note.gif)
Syntax:
The show ip mroute interface command on routing switch "#2" in Multicast network with a multinetted VLAN
HP Switch(config)# show ip mroute interface 29 IP Multicast Interface VLAN : 29 Protocol : PIM-DM TTL Threshold : 0
Syntax:
Lists the following data for the specified multicast flow (source-group pair):
Downstream interfaces
For each downstream interface the following information is shown:
[VLAN]
[VID]
of the VLAN that the routing switch is using to send the outbound packets of the current multicast flow to the next-hop router.
[state]
Indicates whether the outbound VLAN and next-hop router for the current multicast flow are receiving datagrams.
The natural state of a downstream interface in PIM-DM is to forward multicast flows and DM will flood a new flow out all interfaces on a router where there are connected PIM-DM neighbors and/or joined hosts. If there are ultimately no receivers for the flow downstream, the flow will be pruned back to the originator router. This prune state is maintained on all PIM-DM routers by state refresh message sends by the originator and corresponding prune replies from downstream routers. However if a prune reply is not received (i.e. there is now a receiver), expire time indicates how long before the interface will return to a forwarding state.
The natural state of a downstream interface in PIM-DM is to forward multicast flows and DM will flood a new flow out all interfaces on a router where there are connected PIM-DM neighbors and/or joined hosts. If there are ultimately no receivers for the flow downstream, the flow will be pruned back to the originator router. This prune state is maintained on all PIM-DM routers by state refresh message sends by the originator and corresponding prune replies from downstream routers. However if a prune reply is not received (i.e. there is now a receiver), expire time indicates how long before the interface will return to a forwarding state.
Output for routing switch "#1" in Multicast network with a multinetted VLAN
A populated neighbor field indicates that the multicast server is directly connected to the routing switch (neighbor field is highlighted in bold below.)
HP Switch(config)# show ip mroute 239.255.255.5 10.27.30.2 IP Multicast Route Entry Group Address : 239.255.255.5 Source Address : 10.27.30.2 Source Mask : 255.255.255.0 Neighbor : 10.30.229.1 VLAN : 27 Up time (sec) : 408 Expire Time (sec) : 150 Multicast Routing Protocol : PIM-DM Unicast Routing Protocol : rip Downstream Interfaces VLAN State Up time (sec) Expire Time (sec) ---- ---------- ------------------ ----------------- 28 pruned 408 98
Syntax
Show PIM protocol operational and configuration information.
show ip pim
PIM Global Parameters PIM Status : Enabled State Refresh Interval (sec) : 60 Join/Prune Interval (sec) : 60 SPT Threshold : Enabled Traps : none
show ip pim neighbors
Lists PIM neighbor information for all PIM neighbors connected to the routing switch.
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Lists the VLAN through which the routing switch connects to the indicated neighbor. |
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Shows the elapsed time during which the neighbor has maintained a PIM route to the routing switch. |
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Indicates how long before the router will age-out a PIM neighbor/adjacency relationship on the specified interface (VLAN.) When a neighbor/adjacency expires and that neighbor was the last one on the interface, multicast data and state refresh packets will no longer be sent out that interface. Receipt of a periodic PIM hello message from the neighboring PIM router resets this timer to the hold time value stored in the hello message. If the ip-addr is specified then detailed information for the specified neighbor is shown. |
IM Neighbors IP Address VLAN Up Time (sec) Expire Time (sec) --------------- ---- ------------------ ------------------ 20.1.1.2 20 193 83
Syntax:
Output for routing switch "#1" in Multicast network with a multinetted VLAN
HP Switch(config)# show ip pim interface PIM Interfaces VLAN IP Address Mode ---- --------------- ------------ 25 10.38.10.1 dense 27 10.27.30.1 dense 29 10.29.30.1 dense
Syntax:
Displays the current configuration for the specified VLAN (PIM interface.) See PIM interface configuration settings.
Output for routing switch "#1" in Multicast network with a multinetted VLAN
HP Switch(config)# show ip pim interface 29 PIM Interface VLAN : 29 IP Address : 10.29.30.1 Mode : dense Hello Interval (sec) : 30 Hello Delay (sec) : 5 Graft Retry Interval(sec) : 3 Max Graft Retries : 2 Override Interval (msec) : 2500 Lan Prune Delay : Yes Propagation Delay (msec) : 500 Lan Delay Enabled : No SR TTL Threshold : 2 State Refresh Capable : No
PIM interface configuration settings
| Field | Default | Control command |
|---|---|---|
| VLAN | N/A | vlan |
| IP | N/A | vlan vid ip pim-dense any | ip-addr |
| Mode | dense | PIM-dense or PIM-sparse |
| Hello interval (sec) | 30 | ip pim-dense hello interval 5 - 30 |
| Hello hold time | 105 | The routing switch computes this value from the current hello interval and includes it in the hello packets the routing switch sends to neighbor routers. Neighbor routers use this value to determine how long to wait for another hello packet from the routing switch. See the description of the hello interval on PIM VLAN (interface) configuration context. |
| Hello delay | 5 | vlan |
| Graft retry interval (sec) | 3 | vlan |
| Max graft retries | 2 | vlan |
| Override interval (msec) | 2500 | vlan |
| Propagation delay (msec) | 500 | vlan |
| SR TTL threshold (router hops) | 0 | vlan |
| LAN prune delay | Yes | vlan |
| LAN delay enabled | No | Shows
[Yes] [No] |
| State-refresh capable | N/A | Indicates whether the VLAN responds to state-refresh packets. The VLAN connected to the multicast source does not receive state-refresh packets and thus is not state-refresh capable. Downstream VLANs in the switches are state-refresh capable. |
Syntax:
[Group Address]
[Source Address]
[Source Mask]
Indicates the path cost upstream to the multicast source. Used when multiple multicast routers contend to determine the best path to the multicast source. The lower the value, the better the path.
Used when multiple multicast routers contend to determine the path to the multicast source. When this value differs between routers, PIM selects the router with the lowest value.
If Metric Pref is the same between contending multicast routers, PIM selects the router with the lowest Metric value to provide the path for the specified multicast traffic. (Different vendors assign differing values for this setting.)
The time remaining until the routing switch ceases to wait for a response from another multicast router to negotiate the best path back to the multicast source. If this timer expires without a response from any contending multicast routers, the routing switch assumes it is the best path, and the specified multicast group traffic will flow through the routing switch.
Downstream Interfaces
[VLAN]
Lists the VID of the destination VLAN on the next-hop multicast router.
Identifies the reason for pruning the flow to the indicated VLAN:
Prune
A neighbor multicast router has sent a prune request.
Assert
Another multicast router connected to the same VLAN has been elected to provide the path for the specified multicast group traffic.
Other
Used where the VLAN is in the pruned state for any reason other than the above two reasons (such as no neighbors exist and no directly connected hosts have done joins.)
Routing switch "#1" in Multicast network with a multinetted VLAN showing a multicast group from a directly connected source
HP Switch(config)# show ip pim mroute 239.255.255.1 10.27.30.2 PIM Route Entry Group Address : 239.255.255.1 Source Address : 10.27.30.2 Source Mask : 255.255.255.0 Metric :3 Metric Pref :120 Assert Timer : 0 Downstream Interfaces VLAN Prune Reason ---- ------------ 28 prune
Syntax:
Lists the VLAN through which the routing switch connects to the indicated neighbor.
Shows the elapsed time during which the neighbor has maintained a PIM route to the routing switch.
Indicates how long before the routing switch ages-out the current flow (group membership.) This value decrements until:
Reset by a state-refresh packet originating from the upstream multicast router. (The upstream multicast router issues state-refresh packets for the current group as long as it either continues to receive traffic for the current flow or receives state-refresh packets for the current flow from another upstream multicast router.
Reset by a new flow for the current multicast group on the VLAN.
The timer expires (reaches 0.) In this case, the switch has not received either a state-refresh packet or new traffic for the current multicast group and ages-out (drops) the group entry.
If the ip-addr is specified, detailed information for the specified neighbor is shown.
PIM neighbor output
This example simulates output from routing switch “#1” in Multicast network with a multinetted VLAN. The data identifies the first downstream neighbor (“routing switch #2”.)
HP Switch(config)# show ip pim neighbor PIM Neighbors IP Address VLAN Up Time (sec) Expire Time (sec) --------------- ---- ------------------ ------------------ 10.29.30.2 29 196 89
Syntax:
Lists the same information as the
show ip pim neighborShowing a specific neighbor
This example simulates output from routing switch “#1” in Multicast network with a multinetted VLAN. The data is from the first downstream neighbor (routing switch “#2”.)
HP Switch(config)# show ip pim neighbor 10.29.30.2 PIM Neighbor IP Address : 10.29.30.2 VLAN : 29 Up Time (sec) : 26 Expire Time (sec) : 79