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New Member

L3 multicasting not working

All,

Can you please help with the following

We plan to implement multicasting on our network where the sourec and destination are going to be in different vlans.

I have a test 3750 switch, Layer two multicast works fine, when I place the source and destiantion in different VLan it fails

ip routing

!

ip multicast-routing distributed

interface Vlan3  (destination)

ip address 10.2.2.1 255.255.255.0

ip pim dense-mode

end

!

interface Vlan4    (source for mulitcast VLC)

ip address 10.3.3.1 255.255.255.0

ip pim dense-mode

end

Application used for testing = VLC  (239.255.100.100)

Sh ip mroute

(*, 239.255.255.250), 00:44:34/00:02:24, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Dense, 00:07:56/00:00:00

    Vlan4, Forward/Dense, 00:44:34/00:00:00

(*, 239.255.100.100), 00:44:37/00:02:48, RP 0.0.0.0, flags: DC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Dense, 00:00:11/00:00:00

(*, 224.0.1.40), 00:44:38/00:02:17, RP 0.0.0.0, flags: DCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan4, Forward/Dense, 00:44:38/00:00:00

Any help is much appreciated

Kind Regards,

Zee

7 REPLIES
VIP Super Bronze

L3 multicasting not working

Hi Zee,

Can you also turn on ip igmp snooping for both vlans and test again?

ip igmp snooping vlan 3

ip igmp snooping vlan 4

HTH

New Member

L3 multicasting not working

Hi Reza,

IGMP snooping is enabled on both vlan vlans

Vlan 3:

--------

IGMP snooping                       : Enabled

IGMPv2 immediate leave              : Disabled

Explicit host tracking              : Enabled

Multicast router learning mode      : pim-dvmrp    (not sure if this is correct)

Last Member Query Interval          : 1000

CGMP interoperability mode          : IGMP_ONLY

Vlan 4:

--------

IGMP snooping                       : Enabled

IGMPv2 immediate leave              : Disabled

Explicit host tracking              : Enabled

Multicast router learning mode      : pim-dvmrp

Last Member Query Interval          : 1000

CGMP interoperability mode          : IGMP_ONLY

Kind Regards,

Zee

VIP Super Bronze

L3 multicasting not working

Hi Zee,

When you configure VLC, there is an area where you have to specify the TTL, make sure that number is 2 or 3 and not 1.

than test again

HTH

New Member

L3 multicasting not working

I have tried using TTL as 2 and 3 but no luck please see screenn shot for details

Kind Regards,

Zee

VIP Super Bronze

L3 multicasting not working

Ok, this look good.  

What license level do you installed on this switch

sh lice

VIP Super Bronze

L3 multicasting not working

forgot to add this to my previous post but

To run layer-3 multicast, you need IP services license

IP Services: Includes IP Base and enables  advanced IPv4/IPv6 Layer 3 routing such as EIGRP, Open Shortest Path  First (OSPF), WCCP, VRF-lite, PBR, and IPv4 multicast routing.

HTH

New Member

L3 multicasting not working

Hi Reza,

I am using following image its ip services

System image file is "flash:/c3750-ipservicesk9-mz.122-25.SEB4.bin"

following output for sh license

Switch#sh lic?

% Unrecognized command

Switch#sh lic

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