Inter Vlans multicasting is not working.

[Paul Kim]

Hi everyone,

I want to make multicasting with multi Vlans.

I have one switch C3560G-48TS / 12.2(35)SE5.

I build two vlans vlan2 and vlan3.

and they has address like this,

vlan2 10.10.10.254 / 255.255.255.0

vlan3 20.20.20.254 / 255.255.255.0

and I turn on ip route option.

So I success ping test with two host each other.

but When I send multicast packet with Multicast group ip 239.100.100.100 and TTL value 32.

Multicast packet can't reach to any host.

I need your help.

Thank you!

[Giuseppe Larosa]

Hello Paul,

IPv4 multicast routing needs additional commands to work:

a)  ip multicast-routing in global config this makes the device a mcast router

B) on each SVI add

int vlan 2

ip pim sparse-dense mode

exit

int vlan 3

ip pim sparse-dense mode

exit

Create a loopback interface to make the switch an RP

int loop0

ip address 10.255.255.1 255.255.255.255

ip pim sparse-mode

exit

ip pim rp 10.255.255.1

Note:

if you have multiple devices the loop0 has to be created only on one f them and it needs to be advertised in a unicast routing protocol like OSPF or EIGRP.

Enabling PIM on an SVI enables also IGMP (version 2 by default)

IGMP deals with receivers (PCs)

PIM is needed between multicast capable routers on all links between them

Hope to help

Giuseppe

Hope to help

Giuseppe

[Paul Kim]

Pre much thank you for your rapidly response.

I know your way.

I searching almost a day too find ways.

But I can't see any multicast-routing command in global mode.

Maybe IOS version is too old.

Do you know me other way about my IOS version?

[Paul Kim]

If I can't find ip multicast-routing command in global config.

How can I use multicasting with my switch?

Need I update IOS version to latest or other command exist for IOS old version?

[paul driver]

Hello

You will need to enable ip multicasting and apply pim to the svi of the L3 switch

conf t

ip multicast-routing distributed

int vlan xx
ip pim sparse-dense-mode
exit

[Paul Kim]

If I can't find ip multicast-routing command in global config.


How can I use multicasting with my switch?



Need I update IOS version to latest or other command exist for IOS old version?

[paul driver]

Hello

What switch/ios are you running?

[Paul Kim]

I using C3560G-48TS / 12.2(35)SE5.

[Georg Pauwen]

Hello,

as far as I recall, IP Multicast routing is supported only on Catalyst 3560-CX switches...

Either that, or you need the IP Services image. Which one do you have ?

Best to post the output of 'show license'...

[paul driver]

Hello

That make/model and ios feature should support MC routing.

can you post what message you receive when you try to enable MC rorutingy?

Also show the output of the following:
sh sdm prefer

[Paul Kim]

[Meheretab Mengistu]

Hi Paul,
I believe you are using IPBASE image (C3560-IPBASE-M), which does not support multicast routing. You can share the output of "show version" to be sure.

HTH,
Meheretab

[Giuseppe Larosa]

Hello Paul,

post

show version

show version | inc image

As already noted you are likely running a software image that allows only to use IGMP snooping but not full multicast routing.

With these old images the image name tells the feature set ( it is part of the name).

Alternatively you may need to change the sdm template to another type (this requires reload to take effect) as you have a desktop SDM template. You may need to change it to another type more routing oriented ( I don't remember the exact name for your switch)

Hope to help

Giuseppe

[Paul Kim]

Thank you for everyone.

Now I know why couldn't using multicasting with my switch.

So what is best way to use multicasting?

If should i reload or update image is not good for me.

Because my other cisco switch almost 10 more is working in client office.

They doesn't like change and afraid lost configuration.