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Enabling igmp !

illusion_rox
Level 1
Level 1

‎07-13-2008 06:22 PM - edited ‎03-06-2019 12:09 AM

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 ?

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bvsnarayana03
Level 5
Level 5

‎07-14-2008 03:12 AM

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.

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illusion_rox
Level 1
Level 1
In response to bvsnarayana03

‎07-14-2008 03:51 AM

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

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Harold Ritter
Cisco Employee
Cisco Employee

‎07-14-2008 05:51 AM

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
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Cisco México
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Cuauhtémoc, Juárez
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