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MultiCast Question

I am trying to ghostcast a group of PC's over a layer 3 network. I am able to reach them via multicast but it seems like it's taking too long to get them all done. For 8 it took about an hour to do. I am using PIM Sparse Mode and pointing everything to an RP that is the vlan interface's ip address that the ghost cast server is on (as it is the only thing currently capable of multicast currently being used on the network). Here's the path it follows..

Gig connected GhostCast Server on a 6513 with a 720 sup engine.

10 Gig Layer 3 Fiber connection to another 6513 to the PC's which are 100 meg connected

Does anyone have any ideas as to how to speed this up? Is Sparse-Dense mode a possibility?

2 REPLIES
Bronze

Re: MultiCast Question

Perhaps the network is not the bottleneck. I always had issues with older versions (circa 2002) of Ghostcast using Multicast concerning speed. It could be the fact that the server can't process the requests.

Community Member

Re: MultiCast Question

It shouldn't make any difference because sparce mode means hosts need to manually join vs. a flooding and pruning with dense mode.

I like Sparse-Dense. See configs below:

ip multicast-routing

interface Ethernet1/1/3

description Temp for TEMs 66.120-127/29

ip address 10.10.66.126 255.255.255.248

ip pim sparse-dense-mode ---- This command goes on all vlan interfaces.

ip igmp join-group 224.100.100.1

ip pim send-rp-announce FastEthernet1/0/0 scope 15 - I am the RP and my address is the address of fa1/0/0. Probably should use a loopback0 interface instead.

ip pim send-rp-discovery scope 15 - Look for the RP (put on all machines)

ERTL_7507#sh ip pim rp

Group: 224.100.100.1, RP: 10.10.56.1, v2, v1, next RP-reachable in 00:00:06

Group: 224.0.1.60, RP: 10.10.56.1, v2, v1, next RP-reachable in 00:00:26

Group: 224.0.1.1, RP: 10.10.56.1, v2, v1, next RP-reachable in 00:00:52

Group: 228.5.6.7, RP: 10.10.56.1, v2, v1, next RP-reachable in 00:01:26

3550_Cop_INF_Rack#sh ip pim rp

Group: 224.0.1.1, RP: 10.10.56.1, v2, v1, uptime 00:55:48, expires 00:02:47

Group: 228.5.6.7, RP: 10.10.56.1, v2, v1, uptime 00:55:48, expires 00:02:47

Group: 224.0.1.60, RP: 10.10.56.1, v2, v1, uptime 00:55:48, expires 00:02:47

interface Ethernet1/1/3

description Temp for TEMs 66.120-127/29

ip address 10.10.66.126 255.255.255.248

ip pim sparse-dense-mode

ip igmp join-group 224.100.100.1

unclass_1

ip multicast-routing

ip pim GigabitEthernet10/14 scope 15

ip pim send-rp-discovery scope 15

interface GigabitEthernet10/16

description Uplink to FO-switch B (Int#1)

ip address 11.11.112.165 255.255.255.252

ip pim sparse-dense-mode

!

interface Vlan511

ip pim sparse-dense-mode

ip igmp join-group 224.100.100.1

STATUS INFO:

Router#sh ip pim rp

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