?
Solved

Multicasting (Ghost) across VLANs

Posted on 2011-03-17
10
Medium Priority
?
1,175 Views
Last Modified: 2012-08-13
Hi all,

I have read many posts regarding this and see that there are many answers to many questions.  So please bear with me if I have missed an obvious solution somewhere.

We have a training centre with multiple rooms, each room has been allocated a port one 3COM 5500-E gig (backbone) switch and that port has been allocated into a VLAN also setup on the 3COM switch.  We have a DHCP server distributing an IP scope for each room.  This is also in its own VLAN on a trunk port on the 3com switch.

Everything DHCP wise seems to be working as expected,  when  you attempt a ghost multicast session, the client connects to the ghost server and then hangs.  Unicasts work.

If you move the port allocated to the room on the 3com switch into the Ghosting VLAN, as you would expect, it works.  However, all the rooms must have their own VLAN otherwise the ghosting floods the network.

IGMP snooping is enabled on the room switches (3com 2400) as well as the 3com 5500-e switch.

Cheers,
Sam
0
Comment
Question by:sam-walker
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
10 Comments
 
LVL 6

Expert Comment

by:RKinsp
ID: 35159916
For multicasting between VLANs you must enable your Layer 3 switch to do Multicast Routing. Is multicast routing enabled on your 5500?
0
 
LVL 6

Accepted Solution

by:
RKinsp earned 2000 total points
ID: 35160043
commands:
system-view
multicast routing-enable
interface vlan X
igmp enable
pim sm (or pim dm. sm is more common)
0
 

Author Comment

by:sam-walker
ID: 35160144
Thanks RKinsp, I will try this tommorrow.

From the switch it appears that there is only on VLAN interface (1) for multiple VLAN's.  Is that normal? or would you expect to have a VLAN interface for each VLAN?
0
Connect further...control easier

With the ATEN CE624, you can now enjoy a high-quality visual experience powered by HDBaseT technology and the convenience of a single Cat6 cable to transmit uncompressed video with zero latency and multi-streaming for dual-view applications where remote access is required.

 
LVL 6

Expert Comment

by:RKinsp
ID: 35160419
You need one vlan interface for every VLAN you are routing from that switch.

If you are routing between VLANs at a different point in your network, then you don't, but if i understood your design, you have no other routers/layer 3 switches, right?

-RK
0
 
LVL 46

Expert Comment

by:Craig Beck
ID: 35164338
I think you're looking at one of the switches in one of your rooms.  You need to look at the switch where all the room switches connect to.  This switch will have an IP address for each VLAN, and this is where you need to enable PIM.  Its usually easiest to configure PIM-DM per VLAN.
0
 

Author Comment

by:sam-walker
ID: 35164580
RKinsp, yes, you are correct, there is no other layer 3 switch working on the network.

Apologies, there is a VLAN interface for every VLAN, I was looking at the correct switch but via the GUI which is not very intuitive in displaying information.

I checked the config via a telnet session and it was clear that there were VLAN interface for each VLAN as you would expect.

I have applied the changes you suggested to one VLAN and tested the ghosting, but unfortunately it did not work.  Now, please excuse my lack of knowledge here, but I did not save the config just yet, but it should take effect as it loaded into running memory, is that correct?

Note; I used pm dm as craigback suggested
0
 

Author Comment

by:sam-walker
ID: 35164593
Sorry - PIM DM
0
 

Author Comment

by:sam-walker
ID: 35165507
Hi RKinsp,

That has actually worked now!  It was my failure not to apply it to the Ghost VLAN (Doh!)

Thankyou so much for your help, your are a true Gent!
0
 

Author Closing Comment

by:sam-walker
ID: 35165512
RKinsp is a top guy.
0
 
LVL 6

Expert Comment

by:RKinsp
ID: 35166046
Thanks Sam. Glad to help

-RK
0

Featured Post

Supports up to 4K resolution!

The VS192 2-Port 4K DisplayPort Splitter is perfect for anyone who needs to send one source of DisplayPort high definition video to two or four DisplayPort displays. The VS192 can split and also expand DisplayPort audio/video signal on two or four DisplayPort monitors.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The worst thing when starting a new job is when the previous Network Administrator left behind no documentation. How do you get into the devices? If you've been in this situation or just accidently mistyped your password, this article will hopefully…
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question