Displaying IGMP Snooping Information

You can use various show commands to view information about IGMP snooping.

Use one of the following commands to view IGMP snooping information. The commands do not need to be entered in the specified order. Using these commands is optional and they can be entered in any order. For more information on the full list of

show ip
               multicast

commands, refer to the RUCKUS FastIron Command Reference.

Enter the

show ip multicast

command to display global IGMP snooping configuration.

device> show ip multicast

Summary of all vlans. Please use "sh ip mu vlan <vlan-id>" for details
Version=2, Intervals: Query=30, Group Age=80, Max Resp=10, Other Qr=65,
                      Leave Wait=2, Robustness=2

Replication resource sharing: Enabled.
VL20: dft V2, glb cfg active, 0 grp, 0 (*G) cache, no rtr port,
  My Query address: 20.1.1.1 (configured)
VL30: cfg V3, glb cfg active, track, 0 grp, 0 (SG) cache, no rtr port,
  My Query address: 30.1.1.1 (configured)
VL40: dft V2, glb cfg active, 0 grp, 0 (*G) cache, no rtr port,
  My Query address: None
VL100: dft V2, vlan cfg passive, 0 grp, 0 (*G) cache, rtr ports,
    router ports: e2/1/15(80) 10.1.1.1,
  My Query address: None
VL200: dft V2, vlan cfg passive, 0 grp, 0 (*G) cache, rtr ports,
    router ports: e2/1/15(80) 20.2.2.2,
  My Query address: None

Enter the

show ip multicast

command and specify a VLAN to display IGMP snooping information for the specified VLAN.

device> show ip multicast vlan 11

Version=2, Intervals: Query=300, Group Age=620, Max Resp=10, Other Qr=605,
                      Leave Wait=2, Robustness=2

VL11: dft V2, vlan cfg active, 20 grp, 0 (*G) cache, no rtr port, 
  My Query address: 1.1.1.1 (ve/loopback)
  e1/2/2    has   20 grp, QR, default V2
    group: 225.1.11.14, life = 520
    group: 225.1.11.6, life = 520
    group: 225.1.11.12, life = 520
    group: 225.1.11.16, life = 520
  lg203     has    0 grp, QR, default V2 trunk
  e31/2/1   has    0 grp, QR, default V2

Enter the show ip multicast error command to display information about possible IGMP errors.
```
device> show ip multicast error

snoop SW processed pkt: 173, up-time 160 sec
```

Enter the show ip multicast group command to display information about IGMP groups.

device> show ip multicast group

p-:physical, ST:static, QR:querier, EX:exclude, IN:include, Y:yes, N:no
VL70 : 3 groups, 4 group-port, tracking_enabled
      group            p-port   ST     QR     life mode    source
1     224.1.1.2        1/1/33   no     yes    120  EX      0
2     224.1.1.1        1/1/33   no     yes    120  EX      0
3     226.1.1.1        1/1/35   yes    yes    100  EX      0
4     226.1.1.1        1/1/33   yes    yes    100  EX      0

Enter the show ip multicast group command with the detail keyword, and specify a group address, to display detailed information about an IGMP group.

device> show ip multicast group 226.1.1.1 detail

Display group 226.1.1.1 in all interfaces in details.
p-:physical, ST:static, QR:querier, EX:exclude, IN:include, Y:yes, N:no
VL70 : 1 groups, 2 group-port, tracking_enabled
      group            p-port   ST     QR     life mode    source
1     226.1.1.1        1/1/35   yes    yes    120  EX      0
    group: 226.1.1.1, EX, permit 0 (source, life):
      life=120, deny 0:
      group            p-port   ST     QR     life mode    source
2     226.1.1.1        1/1/33   yes    yes    120  EX      0
    group: 226.1.1.1, EX, permit 0 (source, life):
      life=120, deny 0:

Enter the show ip multicast mcache command to display 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)

Enter the show ip multicast cluster mcache command to display 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)

Enter the show ip multicast resource command to display information about the software resources used.

device> show ip multicast resource

                      alloc in-use  avail get-fail    limit  get-mem  size init
igmp group              256      1    255        0    32000        1    16  256
igmp phy port          1024      1   1023        0   200000        1    22 1024
.... entries deleted ...
snoop mcache entry      128      2    126        0     8192        3    56  128
total pool memory 109056 bytes
has total 2 forwarding hash

Enter the show ip multicast traffic command to display information about IPv4 PIM traffic statistics.

device> show ip multicast traffic

IGMP snooping: Total Recv: 22, Xmit: 26
Q: query, Qry: general Q,  G-Qry: group Q,  GSQry: group-source Q, Mbr: member
Recv      QryV2     QryV3     G-Qry     GSQry     MbrV2     MbrV3     Leave
VL1           0         0         0         0         4         0         0
VL70         18         0         0         0         0         0         0
Recv       IsIN      IsEX      ToIN      ToEX     ALLOW     BLOCK   Pkt-Err
VL1           0         4         0         0         0         0         0
VL70          0         0         0         0         0         0         0
Send      QryV2     QryV3     G-Qry     GSQry     MbrV2     MbrV3
VL1           0         0         8         0         0         0
VL70          0         0         0         0         0        18
VL70   pimsm-snooping, Hello:    12,  Join/Prune:     9

IPv4 Multicast VLAN Traffic Reduction

Displaying IGMP Snooping Information