RE: IGMP on ethernet interface

From: Colin Barber (Colin.Barber@telewest.co.uk)
Date: Fri Sep 27 2002 - 11:37:32 GMT-3


enabling pim on an interface automatically enables IGMP.

Colin

-----Original Message-----
From: Khalid Siddiq [mailto:khalid@sys.net.pk]
Sent: 27 September 2002 09:09
To: ccielab@groupstudy.com
Subject: IGMP on ethernet interface

I read that, enabling ip multicasting on router will enable IGMP ver 2
on the ethernet interface, but in my case this is not happening ,
IOS is flash:/c2500-p-l.121-16.bin"
Is i am missing something ???

!
ip multicast-routing
!
!
interface Loopback0
 ip address 130.2.2.8 255.255.255.255
!
interface Ethernet0
 ip address 10.1.0.4 255.255.0.0
 ip ospf cost 100

R8#sh ip ig
R8#sh ip igmp int e 0
Ethernet0 is up, line protocol is up
  Internet address is 10.1.0.4/16
  IGMP is disabled on interface
  Multicast routing is disabled on interface
  Multicast TTL threshold is 0
  No multicast groups joined

If i enable pim on ethernet interface

!
interface Ethernet0
 ip address 10.1.0.4 255.255.0.0
 ip pim dense-mode
 ip ospf cost 100

R8#sh ip ig
R8#sh ip igmp int e 0
Ethernet0 is up, line protocol is up
  Internet address is 10.1.0.4/16
  IGMP is enabled on interface
  Current IGMP version is 2
  CGMP is disabled on interface
  IGMP query interval is 60 seconds
  IGMP querier timeout is 120 seconds
  IGMP max query response time is 10 seconds
  Last member query response interval is 1000 ms
  Inbound IGMP access group is not set
  IGMP activity: 0 joins, 0 leaves
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  Multicast designated router (DR) is 10.1.0.4 (this system)
  IGMP querying router is 10.1.0.4 (this system)
  No multicast groups joined
R8#

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