From: Carlos Alberto Trujillo Jimenez (carlos.trujillo.jimenez@gmail.com)
Date: Thu Mar 20 2008 - 21:59:50 ART
Luca.
Can you give us more details about your lab test??
Like for example, is there a pim router? from where are you doing the ping
to the multicast address?
If there is a multicast router, you can do a "show ip igmp group" and you
must see the group the switch is joining or tryin to join:
r6#show ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last
Reporter Group Accounted
229.9.9.9 FastEthernet0/0.10 00:00:03 00:02:56 151.10.26.2
224.0.1.40 FastEthernet0/0.10 00:01:47 00:02:55 151.10.26.6
r2#show run int fastEthernet 0/0.10
Building configuration...
Current configuration : 183 bytes
!
interface FastEthernet0/0.10
description VLAN10
encapsulation dot1Q 10
ip address 151.10.26.2 255.255.255.0
ip igmp join-group 229.9.9.9
ipv6 address 2001:151:10:26::2/64
2008/3/20, lhall@setnine.com <lhall@setnine.com>:
>
> I'm doing some labs using 3750's, for a reason I cannot figure out,
> these will not respond to pings if on physical port (no switchport)
> you configure `ip igmp join-group X` _unless_ you also enable PIM on the
> on the interface and enable `ip multicast-routing distributed`.
> Does anyone know why this is?
>
> Wont work:
>
> interface FastEthernet1/0/3
> no switchport
> ip address 12.2.40.5 255.255.255.0
> ip igmp join-group 225.1.1.1
> no ip mroute-cache
>
> Will work:
>
> ip multicast-routing distributed
> !
> interface FastEthernet1/0/3
> no switchport
> ip pim dense-mode (or sparse etc)
> ip address 12.2.40.5 255.255.255.0
> ip igmp join-group 225.1.1.1
> no ip mroute-cache
>
> They are all WS-C3750-24TS running 12.2(25)SEE C3750-ADVIPSERVICESK.
>
>
> Luca
>
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