If you decide to
enable MMoH on LAN, by default MMoH streams will flood your LAN for all VLANs.
Multicasting is unlike broadcast (per-VLAN). Instead it is flooded out of all
ports regardless of their VLAN membership. One way of resolving this is using
IGMP Snooping. This example shows the process of IP Phone joining IGMP group to
start receiving MMoH while IGMP Snooping Enabled.
Prerequisites
- Enable IGMP Snooping (enabled by default on all new switches)
- Enable IGMP Querier on the Root Switch. Note: You need to enable IGMP Querier for one time to trigger IGMP Snooping learning process (the process of mapping ports to IGMP Group Addresses).
Setup Details
- MMoH server IP is 239.1.1.11
- Phone IP is 10.170.4.149
- VLAN number 104
- Port Number Te3/1
!!! ..... Call Placed on Hold
Jan 8 2015 13:59:06.748 UAE: IGMPSN: Received
IGMPv2 Report for group 239.1.1.11 received on Vlan 104, port Te3/1
Jan 8 2015 13:59:06.748 UAE: IGMPSN: group:
Received IGMPv2 report for group 239.1.1.11 received on Vlan 104, port Te3/1
Jan 8 2015 13:59:06.748 UAE: IGMPSN: group:
Adding client ip 10.170.4.149, port_id Te3/1, on vlan 104
!!! ..... Create IGMP Group on the Switch
Jan 8 2015 13:59:06.748 UAE: IGMPSN: MCAST IP
address 239.1.1.11, MAC address 0100.5e01.010b
Jan 8 2015 13:59:06.748 UAE: IGMPSN: Can not
Locate gce 0100.5e01.010b, on Vlan 104
Jan 8 2015 13:59:06.748 UAE: IGMPSN: MCAST IP
address 239.1.1.11, MAC address 0100.5e01.010b
Jan 8 2015 13:59:06.748 UAE: IGMPSN: Can not
Locate gce 0100.5e01.010b, on Vlan 104
Jan 8 2015 13:59:06.748 UAE: IGMPSN: mgt: created
gce 0100.5e01.010b, on Vlan 104
Jan 8 2015 13:59:06.748 UAE: l2mcm_group_create:
creating a group 239.1.1.11 on vlan 104, dummy NO
Jan 8 2015 13:59:06.748 UAE: l2mcm_group_create:
timer stop: vlan 104, group 239.1.1.11
Jan 8 2015 13:59:06.748 UAE: IGMPSN: mgt: created
group 239.1.1.11, on Vlan 104
Jan 8 2015 13:59:06.748 UAE: IGMPSN: group:
Created group 239.1.1.11
!!! ..... IGMP Port Learning Process
Jan 8 2015 13:59:06.748 UAE: IGMPSN: Add v2 group
239.1.1.11 member port Te3/1, on Vlan 104
Jan 8 2015 13:59:06.748 UAE: IGMPSN: mgt: Vlan
104 gce 0100.5e01.010b add port Te3/1
Jan 8 2015 13:59:06.748 UAE: L2MM: setting Te3/1
in gce->mbr_blist
Jan 8 2015 13:59:06.748 UAE: IGMPSN: group: Added
port Te3/1 to group 239.1.1.11
Jan 8 2015 13:59:06.748 UAE:
l2mcsn_process_report: TIMER_START for group 35.201.180.0 for time 10000 * 100
Jan 8 2015 13:59:06.748 UAE: IGMPSN: group:
Forwarding 239.1.1.11 report to router ports
Jan 8 2015 13:59:26.641 UAE:
l2mcsn_gquery_gce_walk: TIMER_STOP for group 239.1.1.11
!!! ..... Keepalive IGMP Messages
Jan 8 2015 13:59:36.121 UAE: IGMPSN: Received
IGMPv2 Report for group 239.1.1.11 received on Vlan 104, port Te3/1
Jan 8 2015 13:59:36.121 UAE: IGMPSN: group:
Received IGMPv2 report for group 239.1.1.11 received on Vlan 104, port Te3/1
Jan 8 2015 13:59:36.121 UAE: IGMPSN: group: Skip
client info adding - ip 10.170.4.149, port_id Te3/1, on vlan 104
Jan 8 2015 13:59:36.121 UAE: IGMPSN: MCAST IP
address 239.1.1.11, MAC address 0100.5e01.010b
Jan 8 2015 13:59:36.121 UAE: IGMPSN: Locate gce 0100.5e01.010b, on Vlan 104
Jan 8 2015 13:59:36.121 UAE: IGMPSN: locate group 239.1.1.11, on Vlan 104
Jan 8 2015 13:59:36.121 UAE: IGMPSN: Add v2 group
239.1.1.11 member port Te3/1, on Vlan 104
Jan 8 2015 13:59:36.125 UAE: IGMPSN: group: Added
port Te3/1 to group 239.1.1.11
Jan 8 2015 13:59:36.125 UAE:
l2mcsn_process_report: TIMER_START for group 35.201.180.0 for time 10000 * 100
Jan 8 2015 13:59:36.125 UAE: IGMPSN: group:
Forwarding 239.1.1.11 report to router ports
!!! ….. IGMP Report Message
Jan 8 2015 13:59:41.113 UAE: IGMPSN: sync group
for group (239.1.1.11) blist (0)
Jan 8 2015 13:59:41.113 UAE: IGMPSN: timer: Vlan
104 report timer expired
Jan 8 2015 13:59:41.113 UAE: IGMPSN: sync group
for Vlan 104 robustness variable 3
Jan 8 2015 13:59:41.113 UAE: IGMPSN: sync group
for Vlan 104 GCE 0100.5e01.010b
Jan 8 2015 13:59:41.113 UAE: IGMPSN: sync group
for group (239.1.1.11) blist (0)
Jan 8 2015 13:59:41.113 UAE: IGMPSN: group
(239.1.1.11): has v2 Hosts
Jan 8 2015 13:59:41.113 UAE: IGMPSN: group
(239.1.1.11): [0]GQ-miss-list members are:
Jan 8 2015 13:59:41.113 UAE: IGMPSN: group
(239.1.1.11): [1]GQ-miss-list members are:
Jan 8 2015 13:59:41.113 UAE: IGMPSN: group
(239.1.1.11): [2]GQ-miss-list members are:
Before Call on Hold
4507-sw0l#sh
ip igmp snooping groups
Vlan Group Version Port List
----------------------------------------------------------------------
100 239.0.0.10 v2 Gi1/37, Gi1/39, Gi1/40,
Gi1/43, Gi1/44, Gi2/43,
Te3/1
100 224.0.1.60 v2 Te3/1
100 239.255.255.250 v2 Gi1/2, Gi1/3, Gi1/6,
Gi1/8, Gi1/10, Gi1/11,
Gi1/12, Gi1/13, Gi1/14,
Gi1/15, Gi1/16, Gi1/17,
Gi1/18, Gi1/19, Gi1/20,
Gi1/22, Gi1/28, Gi1/32,
Gi1/33, Gi2/1, Gi2/2,
Gi2/3, Gi2/5, Gi2/7,
Gi2/8, Gi2/11, Gi2/12,
Gi2/14, Gi2/17, Gi2/18,
Gi2/27, Gi2/34, Gi2/35,
Te3/1, Gi5/7, Gi5/9,
Gi5/22, Gi5/23, Gi5/28
102 239.192.152.143 v2 Te3/1
102 239.255.255.250 v2 Te3/1
102 239.255.255.253 v2 Te3/1
107 239.255.255.250 v2 Te3/1
After Call on Hold
4507-sw0l#sh
ip igmp snooping groups
Vlan Group Version Port List
----------------------------------------------------------------------
100 239.0.0.10 v2 Gi1/37, Gi1/39, Gi1/40,
Gi1/43, Gi1/44, Gi2/43,
Te3/1
100 224.0.1.60 v2 Te3/1
100 239.255.255.250 v2 Gi1/2, Gi1/3, Gi1/6,
Gi1/8, Gi1/10, Gi1/11,
Gi1/12, Gi1/13, Gi1/14,
Gi1/15, Gi1/16, Gi1/17,
Gi1/18, Gi1/19, Gi1/20,
Gi1/22, Gi1/28, Gi1/32,
Gi1/33, Gi2/1, Gi2/2,
Gi2/3, Gi2/5, Gi2/7,
Gi2/8, Gi2/11, Gi2/12,
Gi2/14, Gi2/17, Gi2/18,
Gi2/27, Gi2/34, Gi2/35,
Te3/1, Gi5/7, Gi5/9,
Gi5/22, Gi5/23, Gi5/28
102 239.192.152.143 v2 Te3/1
102 239.255.255.250 v2 Te3/1
102 239.255.255.253 v2 Te3/1
104 239.1.1.11 v2 Te3/1
107 239.255.255.250 v2 Te3/1
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