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multicasting

I have a Cisco network which consists of 2 core 6513 switches which feed about 20 edge switches which are Cisco 3550 and 3750s. Vlan 1 is for management and vlan 10 is where the network peripherals are attached to. We are doing a mass rollout and require multicast enabling throughout the network so we can ghost the PCS from the users desk. Any help appreciated.
Ip multicast routing is enabled on the 2 catalyst Cisco 6513s. Where else do I put the commands
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andrewwismith
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andrewwismith
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1 Solution
 
matrixnzCommented:
As long as the clients can connect to the Ghost Server than there shouldn't be any issues, even if you aren't able to resolve the name as long as you can insert the Ghost Servers IP Address than it should resolve anyway.

Hope that helps.

Cheers
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andrewwismithAuthor Commented:
That does work using unicast but it is really slow so we need to be able to use multicast
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bfasonCommented:
Are you using the routing functions of the 3550 and 3750's? If so you will need to enable on the edge switches

You may also need to look at the "IP Mroute cache" command on any routed interfaces.

Hope this helps
B
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bfasonCommented:
Another thought, may want to look at any acl's that might be blocking.
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andrewwismithAuthor Commented:
We are not using the routing functions on the edge switches. Do I just enable IP multicast-routing and PIm dense mode on the switches
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matrixnzCommented:
"That does work using unicast but it is really slow so we need to be able to use multicast"
Multicast would be even slower then Unicast basically Unicast doesn't broadcast so is alot quicker then multicast which continuously polls the lan for new clients, which in some cases can cause other computers (i.e. not being reimaged) to lose network connectivity (something to look out for).  In our organisation we did the following, we installed Ghost to a Laptop which held both our Desktop and Laptop Images and then using a 1GB switch we reimaged 10 computers at a time, took about 30 - 45 mins for all 10 this ensured no disruption to other users on the network and worked quite well.  After the rollout we imaged using Unicast.  In our latest rollout we used Dells DFI for all our Systems, i.e. we created an image sent it to Dell so that all new machines were reimaged at the factory before they arrived on site.

Hope that helps.

Cheers
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andrewwismithAuthor Commented:
Fair point. The people here doing the rollout insist unless multicast is enabled they can't continue as it is too slow
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andrewwismithAuthor Commented:
Symantec Ghost minimizes its effect on network traffic by using multicasting, which sends out the image once for many computers rather than resending the image for each client computer. It doesn't work

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bfasonCommented:
Multicast is much quicker than unicast when doing mulitple pc's. I've done up to 20 at a time without causing delays for other users.
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andrewwismithAuthor Commented:
If its multicasting at layer2 is there something I need to enable on the edge switches
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andrewwismithAuthor Commented:
As multicast is still not working we can only unicast. If we disabled the IGMP snooping on the switches would multicast traffic flood out each port. Would this have an impact on the network?
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andrewwismithAuthor Commented:
Also it is all on the same VLAN so we are just multicasting at layer 2
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matrixnzCommented:
"That does work using unicast but it is really slow so we need to be able to use multicast"
"Multicast would be even slower then Unicast"

Sorry I was under the impression that during testing of a single unicast session that it was running slow, i.e. imaging one machine.  If this was true then multicast would be slower then Unicast.  With regards to multicast, causing delays to users, within our company we have a few old systems which still use ISA Cards to Control Old Science Equipment devices, they all have 10mb NICs we also had an old building that was still running on 10/100 link, a number of these computers would lose connection to the network while multicasting.

Have you considered using a Laptop to multicast within each subnet?  In the past we found that as long as your Server (Laptop) is inside or on the same subnet then it will allow you to use multicast.  Have tried Direct Broadcasting rather than Unicasting?

Hope that helps.

Cheers
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andrewwismithAuthor Commented:
I have suggested it but the powers that be want it to run from the ghost server where various different build images are kept. This morning I tried putting some PCs and the ghost server on the same edge switch but it still didn't work. Tomorrow I am going to enable PIM dense mode on Interface vlan 10 and see what happens.
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andrewwismithAuthor Commented:
I issued Ip PIm dense mode on int vlan 10 and it did not work but when i issued the IP PIM sparse mode it worked.
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ee_autoCommented:
Question PAQ'd, 500 points refunded, and stored in the solution database.
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