02-03-2009 11:29 AM - edited 03-06-2019 03:50 AM
Having a real problem configuring this. 6509 core and 3560 edge switches. Can multicast over the same subnet but not between different subnets.
Multicast routing and igmp enable both on the core and edge switches
02-03-2009 11:33 AM
To get multicast across vlans, you need to:
1) enable either pim sparse mode or pim dense mode across the vlans that source and receive the multicast. If you choose sparse then you need to designate an RP for the network.
2) make sure the multicast does not have a TTL=1 and that it is not using a well known multicast IP (not in the 224.0.0.0/24) range.
Perhaps you can explain the topology a little better and provide some configurations?
02-03-2009 11:58 AM
Thanks.
6509 core switch with 3560 edit switches
The core switch configuration pertaining to multicasting is:
ip multicast-routing
interface Loopback254
description Multicast RP address
ip address 10.10.0.254 255.255.255.255
ip pim sparse-mode
delay 1
interface Vlan527
description L3 PTP interface Munroe Test
ip address 10.37.0.1 255.255.255.252
no ip redirects
no ip unreachables
ip pim sparse-mode
The edge switch which have the PC's attached to has the following entries for multicasting
ip multicast-routing distributed
interface Vlan10
description ** Data **
bandwidth 100000
ip address 10.37.10.1 255.255.255.0
ip helper-address 192.168.52.45
no ip redirects
no ip unreachables
no ip proxy-arp
ip pim sparse-mode
standby 10 priority 95
standby 10 preempt
standby 10 track GigabitEthernet0/1
I am not sure of the command to find what the TTL is set to thanks
02-03-2009 12:05 PM
Hello Gerry,
in pim sparse mode you need to specify the RP address
add to all L3 devices running PIM included core c6500
conf t
ip pim rp-address 10.10.0.254
this is the simplest way to do this with static mapping
Hope to help
Giuseppe
02-03-2009 12:10 PM
Thanks. I will try that. I'm assuming that I have to ad the ip pim rp-address as well to the core???
02-03-2009 12:17 PM
A couple pieces are missing:
1. does vlan 10 on the core have the PIM command? or does vlan 527 on the edge have the PIM command? There needs to be a multicast enabled subnet to get the traffic from vlan 527 to vlan 10 if it is not enabled on the same switch.
2. do you have the 'ip pim rp-address ...' on both switches? What is the output of 'show ip pim rp map'
3. to find out the ttl you need to install wireshark somewhere local to the source and capture the multicast traffic, ttl should be in the ip header.
02-03-2009 12:24 PM
Both the VLAN and 527 have the pim command.
Output from show for the core is
PIM Group-to-RP Mappings
Group(s): 224.0.0.0/4, Static
RP: 10.10.0.254 (?)
02-03-2009 12:34 PM
Ok if you have the commands:
'ip pim rp-address 10.10.0.254'
On both the 6500 and the 3560 you should be good.
Do you have the multicast group address you are trying to route?
what does 'show ip mroute
You might want to open a TAC case for this, probably can solve this really quick over the phone.
02-03-2009 12:37 PM
Thanks..
As soon as I made the entry in the 3560 for the ip pim rp address we were able to multicast.
Thanks for all the input!
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