Transfer multicast through VLANs for KVM Over Ip

I am currently designing an architecture of Terminal servers, using the KVM-Over-IP technology (I use features of Gefen) where I have two VLAN:

  • A VLAN for screens (receivers KVM) at 192.168.240.0/24
  • A VLAN for servers (KVM shippers) to 192.168.241.0/24

I use a Switch Cisco 3750 G Layer 3. I have configured all the VLAN with their gateways (. 1) and there is connectivity between devices, so this ping between them, etc. The configuration is as follows (this is an excerpt, the rest are the default values)

IP routing
IP multicast-routing distributed
!

GigabitEthernet1/0/1 interface
switchport access vlan 2
!
interface GigabitEthernet1/0/2
switchport access vlan 10
!
interface Vlan2
IP 192.168.240.1 255.255.255.0
IP pim sparse - dense mode
!
interface Vlan10
IP address 192.168.241.1 255.255.255.0
IP pim sparse - dense mode
!

Now, KVM (these devices Gefen DVI KVM) devices cannot auto detect other KVM devices in different VLANS. It is to be expected, because the broadcast messages do not exceed the limits VLAN. After further investigation, looks like these devices use multicast groups to annonunce themselves, using standard TCP connections later to perform the video transmission.

To solve the problem, I enabled routing multicast distributed and also tried activation sparse dense mode. Using wireshark with duplication of port I see some messages of the devices within a local network VIRTUAL membership report and Protocol PIM from the interface messages VLAN (. 1), but the devices fail to see each other again.

Thus, from scratch, how should I configure the 3750G for multicast traffic is shared between the VLANS? I also checked the MVR nothing helps.

Thanks in advance.

Just a thought.

What is the Group of multicast discovery? If 224.0.0.x. that is not specific to the local LAN segment with a TTL of 1. In these cases the multicast routing road it.

If it's another group of multicast, always check the LIFE expectancy in the packages. It can always be 1.

Tags: Cisco Network

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