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How to disable NX-OS Optimised Multicast Flood (OMF)

from88
Participant
Participant

Hello,

We've a cisco Nexus9000 NXOS: version 7.0(3)I4(4). Some servers need to send L2 mcast packets to flood between themselfes. I've noticed that "Optimised Multicast Flood (OMF)" is blocking multicast flooding between servers. So i need to disable this security feature. But the question how ?

 

IGMP Snooping information for vlan 1320
IGMP snooping enabled
Lookup mode: IP
Optimised Multicast Flood (OMF) enabled

Some configuration guides says that it can be disabled in global or in vlan configuration view, but i dont see that option:

NXOS (config)# no ip igmp snooping ?
<CR> 
event-history Configure event-history buffers
group-timeout Configures group membership timeout in all VLAN/BDs
link-local-groups-suppression Configures Global link-local groups suppression
max-gq-miss Configure general query miss count
mrouter Configures static multicast router interface
proxy Configures IGMP snooping proxy
report-suppression Configures Global IGMPv1/IGMPv2 Report Suppression
v3-report-suppression Configures Global IGMPv3 Report Suppression and Proxy Reporting

 

 

NXOS (config-vlan-config)# no i igmp snooping ?
<CR> 
access-group IGMP access-group
explicit-tracking Configures Explicit Host tracking for VLAN/BD
fast-leave Configures Fast leave for the VLAN/BD
group-timeout Configures group membership timeout in VLAN/BD
last-member-query-interval Configures interval between group-specific Query transmissions
link-local-groups-suppression Configures VLAN/BD link-local groups suppression
mrouter Configures static multicast router interface
proxy Configures IGMP snooping proxy
proxy-leave Proxy Leave
querier Enables snooping querier
querier-timeout Configures querier timeout for IGMPv2
query-interval Configures interval between query transmission
query-max-response-time Configures MRT for query messages
report-flood Configures Report flooding on a VLAN
report-policy IGMP Report Policy
report-suppression Configures IGMPv1/IGMPv2 Report Suppression for the VLAN/BD
robustness-variable Configures RFC defined Robustness Variable
startup-query-count Configures number of queries sent at startup
startup-query-interval Configures query interval at startup
static-group Configures static group membership
v3-report-suppression Configures IGMPv3 Report Suppression and Proxy Reporting for the VLAN/BD
version Configures IGMP version number for VLAN/BD

Any help ?

 

p.s as a workaround i disabled the IGMP snooping.

 

Thank you

1 ACCEPTED SOLUTION

Accepted Solutions

Richard Michael
Cisco Employee
Cisco Employee

you dont need to disable OMF in N9k, as OMF is not there. its only for N7k due to a hardware limitation. Refer: CSCul57924

View solution in original post

1 REPLY 1

Richard Michael
Cisco Employee
Cisco Employee

you dont need to disable OMF in N9k, as OMF is not there. its only for N7k due to a hardware limitation. Refer: CSCul57924

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