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Author Topic: Multicast Advise  (Read 1997 times)

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Offline ableseaman

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Multicast Advise
« on: July 18, 2014, 08:13:38 AM »
Good Afternoon

Looking for some advice/guidance with the setting up of multicast.
We have a site that has a Layer 3 ERS 5600 core switch with a number of Layer 2 ERS 4550 edge switch stacks. All Edge stacks connect back to the Core switch via single fibre uplinks.

We have a simple set-up with 2 VLANs being deployed – 1 Data VLAN (VLAN 1) & 1 IP Telephony VLAN (VLAN 2).

We have an IP TV system connected to the Data VLAN. Workstations on the Data VLAN have VLC Player installed to tie in with the IP TV system. The following configuration had been applied to on the switches to cater for the multicast traffic for the IP TV system.

ERS 5600 – Version 6.2.0
interface vlan 1
ip igmp proxy
ip igmp snooping
no ip igmp mrouter
ip igmp mrouter 1-7      (Ports 1-7 relate to the fibre uplink ports to each Edge stack)

ERS4500 – Version 5.4.0
vlan igmp 1 snooping enable
vlan igmp 1 proxy enable
vlan igmp 1 v1-members 1/1-44,1/46-50,2/1-42,2/50   (Workstations that use IPTV and Uplink Port)

This configuration seems to work for the IPTV system.

We occasionally use a FOG storage node at this site to cover PC image deployments. The FOG system also uses multicast to deploy the image to batches of workstations. The Fog Storage Node and the Workstations are within VLAN 1.

Now the issue we have identified is that when an image session is instigated from the Fog node, the multicast stream appears to run in ‘bursts’, where the time for image completion runs into hours – this time increases when the number of workstations being imaged increases. We identified that the IPTV system is causing this issue. When we remove the IPTV system from the network the multicast stream runs with a much higher data transfer rate and in a smooth continuous stream. The image of the workstations takes a fraction of the time and is consistent regardless of the number of workstations being imaged.

Now as we only image workstations at set times – 2/3 times per year, we could simply disable the port feeding the IPTV system while the FOG system covers the imaging. However I would prefer a more permanent solution as the use of IPTV is likely to increase to other sites we support.

I’ve had a look at multicast documentation for ERS 5000 & 4000 and it covers a fair amount of configuration options.

Is there a simply way to handle this scenario or are we looking at a more robust multicast configuration?

As always any pointers would be appreciated.

Offline adohen

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Re: Multicast Advise
« Reply #1 on: July 20, 2014, 11:58:01 AM »
Create a separate VLAN for your IP-TV and just make sure you have communication between your data and IPTV vlans, that should definitely help.