03-27-2008 07:39 AM - edited 03-05-2019 10:01 PM
Hi,
How do i enable multicast traffic into a VLANs from other VLANs ?
I have configured point-to-point routed links between 2 catslyst 3750 switches.
(multicast source)VLAN 10 ----Routed link-----> VLAN 11 (multicast destination)
I have enable:
ip multicast-routing distributed
My VLAN interface config is as follows:
Switch A
interface Vlan10
ip address 10.41.10.254 255.255.255.0
no ip redirects
ip pim sparse-dense-mode
no ip route-cache cef
no ip route-cache
no ip mroute-cache
Switch B
interface Vlan11
ip address 10.41.11.254 255.255.255.0
no ip redirects
ip pim sparse-dense-mode
no ip route-cache cef
no ip route-cache
no ip mroute-cache
Is it workable ?
03-27-2008 07:49 AM
I would rather configure "ip pim sparse-mode" on the two vlans and then configure the 3750 as the RP. Otherwise, the multicast data could be flooded to vlan11 even if there is no one interested to this traffic on this vlan.
Regards,
03-27-2008 08:00 AM
Thanks for the reply.
In fact to make it clearer, there will always be multicast traffic in both of these VLANs.
I have tried it out in my lab, but i am unable to receive any multicast. What could be an issue ?
What does no ip mroute-cache meant ?
11-23-2009 11:55 AM
you have to put the pim configuration ( ip pim sparse-dense-mode or ip pim sparse) on the 2 side's L3 interface between your 2 3750.
you should so have something like these on your first 3750 :
int vlan xxx
ip pim sparse-dense-mode
int gi1/0/1 --> L3 to second 3750
ip address 172.16.18.1 255.255.255.0 for exemple
ip pim sparse-dense-mode
and on the second 3750
int vlan yyyy
ip pim sparse-dense-mode
int gi1/0/1 (L3 to first 3750)
ip address 172.16.18.2 255.255.255.0 for exemple
ip pim sparse-dense-mode
if you want to use sparse mode, you need to configure RP ( auto-rp or manual RP).
Regards.
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