show ip multicast mcache

Displays information in the multicast forwarding mcache.
Syntax
show ip multicast [ cluster ] mcache [ ip-address | vlan vlan-id ]
Parameters
cluster
Specifies a Multi-Chassis Trunking (MCT) cluster.
ip-address
Specifies an IP address.
vlan vlan-id
Specifies a VLAN.
Modes

User EXEC mode

Usage Guidelines

IGMP snooping is MAC-based for ICX7150-C08 device, for all other devices it is IP-based.

The show default values command does not offer complete output; it shows only IGMP mcache values. The IGMP snooping mcache contains multicast forwarding information for VLANs and you must use the show ip multicast mcache command to display multicast forwarding information for VLANs..

The show ip multicast mcache command displays the following information:

Output Field

Description

(source group)

The source and group addresses of this data stream. (* group) means match group only; (source group) means match both.

For snooping when it is mac-based, Only *,G entries will be present in multicast mcache output for ipv4 and ipv6. S,G entries will not be present.

MAC address

The multicast MAC address. If the device supports MAC-based IGMP snooping, the MAC address is matched for forwarding decision.

IPv4 Multicast Forwarding Mode This option is dynamic. If snooping is MAC-based, MAC will be displayed and if it is IP-based then IP is displayed.

cnt

The number software-processed packets.

OIF

The output interfaces. Static groups apply to the entire VLAN if "entire vlan" is displayed.

age

The age of the mcache. The mcache will be reset to 0 if traffic continues to arrive; otherwise the mcache will be aged out when it reaches the time defined by the ip multicast mcache-age command.

up-time

The uptime of this mcache in seconds.

ref-cnt

Indicates the number of mcaches using the VIDX. The VIDX is shared among mcaches having the same output interfaces.

Examples

The following example shows information in the multicast forwarding mcache. 

device> show ip multicast mcache

Example:
    (S G) (MAC ADDR) cnt=: SRC and GRP IPv4/IPv6 address,
    Multicast Mac address, cnt is number of SW processed packets
    OIF: 1/1/22 TR(1/1/32,1/1/33), TR is trunk, 1/1/32 primary, 1/1/33 output
IPv4 Multicast Forwarding Mode: MAC
                                                                                 
Total Multicast Cache: 10
vlan 4089, 10 caches. 
1    (* 225.1.1.1) (0100.5e01.0101) cnt=97
     OIF: tag e1/1/2 
     age=3s up-time=4372s, change=448s l2mc=257 (ref-cnt=1)
2    (* 236.1.1.8) (0100.5e01.0108) cnt=4
     OIF: tag e1/1/2 
     age=9s up-time=4372s, change=439s l2mc=257 (ref-cnt=1)

The following example shows information in the multicast forwarding mcache when data arrives locally. 

device> show ip multicast cluster mcache

Example:
    (S G) (MAC ADDR) cnt=: SRC and GRP IPv4/IPv6 address,
    Multicast Mac address, cnt is number of SW processed packets
    OIF: 1/1/22 TR(1/1/32,1/1/33), TR is trunk, 1/1/32 primary, 1/1/33 output
         [1,10]: [1 - has local oif, 10 - ICL due to CCEP count]
IPv4 Multicast Forwarding Mode: IP
Total Multicast Cache: 1
vlan 11, 1 caches. 
1    (192.85.1.44 225.1.1.1) (0100.5e01.0101) cnt=2
     OIF: tag e1/1/35 [1,0] tag lg130 [0,1] tag e1/1/5 [1,0] tag lg1 [1,0] 
     age=28s up-time=28s, change=28s ipmc=361 (ref-cnt=1)
History
Release version Command history
08.0.20 This command was modified to display Multi-Chassis Trunking (MCT) cluster information.
08.0.92 The command output was modified.
Parent topic: Show Commands