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New Member

Enabling igmp !

hi every1, i read in the book that to enable igmp on LAN interfaces we just need to enable ip multicast-routing. but when i do it, igmp still is disabled as shown by the show ip igmp interface commmand ! why is this so ?

3 REPLIES

Re: Enabling igmp !

IGMP is enabled with "ip multicast-routing" only on fastethernet /gig interfaces. IGMP is used only for LAN, so you may not see it on serial interfaces.

New Member

Re: Enabling igmp !

how about on Ethernet (10baseT) interfaces ?? coz i am using ethernet interface and its not being enabled !!!

Cisco Employee

Re: Enabling igmp !

Ovais,

You also need to enable PIM at interface level (ip pim sparse-mode for instance) to enable IGMP.

Regards,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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