show ip mcache

Use this command to display the IP multicast forwarding cache that was used to program the hardware flow.

Syntax

show ip mcache [group group | source source] [interface] [verbose | brief | summary] [statistics] [-wide]

Parameters

group group (Optional) Displays information about a specific multicast destination address.
source source (Optional) Displays information about a specific unicast source address.
interface (Optional) Displays mcache information filtered for the inbound interface.
verbose (Optional) Displays a detailed level of information.
brief (Optional) Displays a single line brief level of information.
summary (Optional) Displays the number of entries currently in the cache.
statistics (Optional) Displays multicast cache statistics.
-wide (Optional) Specifies that the display should use up to 132 characters per line if applicable.

Defaults

If no optional parameters are specified, detailed information about all source and destination addresses will be displayed. The statistics verbose option uses a standard 80 column format.

Mode

All command modes.

Usage

An 80 character line can display statistics for up to 4 slots. If your system has more than 4 slots, use the -wide option to allow for the display of slots beyond slot 4 on a single line.

The output of this command shows what multicast routes have actually been programmed into the S- K- and 7100-Series hardware. Although redundant to the show ip mroute display (show ip mroute), it is a useful debugging tool if there are discrepancies between the multicast routing table and the multicast forwarding table.

Example

This example shows a portion of the IP multicast forwarding cache display:

System(su)->show ip mcache
IP Multicast Cache Table
FLAGS: S - L2 flow, M - MFIB entry, N - Null OIF, T - static
       C - CPU Flow (not in HW), A - flow active, X - pending deletion
       F - register
 Group            Source           Interface    Flags       Age
 224.1.1.1        110.1.1.10       vlan.0.13    MA       0d 00h:11m:44s
     Outgoing Interface List:
       vlan.0.1040
 230.1.1.1        20.1.1.10        vlan.0.23    MA       0d 00h:10m:35s
     Outgoing Interface List:
       vlan.0.1040
 239.1.1.1        192.168.101.10   vlan.0.1010  MA       0d 00h:11m:49s
     Outgoing Interface List:
       vlan.0.13
       vlan.0.23
       vlan.0.1040
3 mcache entries displayed

This example shows to display IP multicast forwarding cache statistics:

System(rw)->show ip mcache statistics
IP Multicast Cache Statistics
These counters represent IP Multicast packets seen in the soft-path only.
Total IP Multicast packets received        : 634
IPv4 IP Multicast packets received         : 634
IPv6 IP Multicast packets received         : 0
Multicast packets dropped due to TTL       : 0
Multicast packets dropped due to ACL       : 0
Data packets sent up to PIM at DR          : 95
Register packets received at RP            : 653
Decapsulated register packets transmitted  : 1048
System(rw)->

This example shows how to display a verbose level of IP multicast forwarding cache statistics:

System(rw)->show ip mcache statistics verbose
IP Multicast Cache Statistics
These counters represent IP Multicast packets seen in the soft-path only.
Statistic             Totals     Slot  2     Slot  3
-----------------------------------------------------
Packets in      :        634          42         592
v4 Pkts in      :        634          42         592
v6 Pkts in      :          0           0           0
Drop TTL        :          0           0           0
Drop ACL        :          0           0           0
Sent to PIM     :         95          95           0
Registers recvd :        653         170         483
RP transmits    :       1048        1048           0
System(rw)->

This example shows how to display a brief level of multicast forwarding cache statistics:

System(rw)->show ip mcache statistics brief
IP Multicast Cache Statistics
These counters represent IP Multicast packets seen in the soft-path only.
Total IP Multicast packets received        : 634
IPv4 IP Multicast packets received         : 634
IPv6 IP Multicast packets received         : 0
System(rw)->