Use the show ip mroute route command to display information about the multicast routes on the switch. The syntax for this command is as follows.
show ip mroute route [vrf WORD <0–32>] [vrfids <0–255>]
Note
This command is not supported on a node configured as the DvR Leaf within a DvR domain.
The following section shows a sample output for the show ip mroute route command.
In this table, every stream uses one (*,G) entry and x (S,G) entries, depending on how many servers forward traffic to the same group.
The 0.0.0.0 mask is always tied to a (*,G) entry.
Every time a new stream comes in, Protocol Independent Multicast (PIM) creates two entries in the table; one is a (*,G) entry that points toward the rendezvous point (RP) router, and the other is an (S,G) entry that points toward the source.
Switch:1#show ip mroute route
================================================================================
Mroute Route - GlobalRouter
================================================================================
GROUP SOURCE SRCMASK UPSTREAM_NBR IF EXPIR PROT
--------------------------------------------------------------------------------
233.252.0.1 0.0.0.0 0.0.0.0 0.0.0.0 V3 30 pimsm
233.252.0.1 198.51.100.99 255.255.255.0 0.0.0.0 - 0 pimsm
233.252.0.2 0.0.0.0 0.0.0.0 0.0.0.0 V2 30 pimsm
225.1.1.1 198.51.100.99 255.255.255.0 0.0.0.0 V3 173 spb-pim-gw
Total 4
The following table shows the field descriptions for this command.
|
Field |
Description |
|---|---|
|
GROUP |
Indicates the IP multicast group for this multicast route. |
|
SOURCE |
Indicates the network address that, when combined with the corresponding value of SRCMASK, identifies the sources for this multicast route. |
|
SRCMASK |
Indicates the network mask that, when combined with the corresponding value of SOURCE, identifies the sources for this multicast route. |
|
UPSTREAM_NBR |
Indicates the address of the upstream neighbor from which IP datagrams from these sources to this multicast address are received, or 0.0.0.0 if the (S,G) source is local or if the RP for this the (*,G) group is an address on this router. |
|
IF |
Indicates the value of ifIndex for the interface that receives IP datagrams sent by these sources to this multicast address. A value of 0 in a (*,G) route indicates that datagrams are not subject to an incoming interface check, but datagrams can be received on any interface. |
|
EXPIR |
Indicates the minimum amount of time remaining before this entry ages out. The value 0 indicates that the entry is not subject to aging. Note:
The value you configure for fwd-cache-timeout applies only to the locally learned sender; it does not apply to SMLT synchronized sender records. |
|
PROT |
Indicates the multicast protocol through which the switch learned this route. |