02-20-2009 01:51 PM - last edited on 03-25-2019 04:05 PM by ciscomoderator
I have recently enabled multicast on my access core 6509 rotuer for two subnet, I see multicast routes on my router with 224.0.1.22 or 229.38.76.218 etc but I don't see anything with 230.0.0.1. My application guys are using this address in their java application: My scenario is like
4006--vlan 21----6509-1---4006--vlan22
6509-1
ip multicast routing
interface Vlan21
ip address 10.1.21.254 255.255.255.0
ip pim sparse-dense-mode
interface Vlan22
ip address 10.1.22.254 255.255.255.0
ip pim sparse-dense-mode
On 4006 I have
set cgmp enable
I'm seeing (S,G) entries for other multicast addresses in that subnet but not for 230.0.0.1
Am I missing anything?
02-20-2009 03:03 PM
Nawaz,
The first thing to check would be the TTL that the application uses by default. The TTL should be greater than 1 for it to work in the current context. This is a very common issue with multicast applications.
Regards
02-20-2009 07:20 PM
HI,
May we know where is your source of this multicast stream? also need to know where are your receiver located?
To do initial investigation we might need the output of the following command:
sh ip pim inter
show ip pim neig
show ip mroute
* are you able to receive multicast stream on same subnet /vlan?
It would be help full if you could post your topology in more detail.
Thanks and Regards
02-23-2009 07:57 AM
TTL value is set to 10
The application is a pure java app that uses a multicastSocket to send a datagram to the selected IP Address and port.
The other portion of the application subscribes to an IP Address and port and listens for packets. Once a packet is found it terminates and I restart the listener.
Show ip mroute, and show ip pim neighbor shows the correct neighbors and ip
Below is the outoput
(*, 224.0.1.60), 2d19h/00:02:21, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan322, Forward/Sparse-Dense, 2d19h/00:00:00
Vlan321, Forward/Sparse-Dense, 2d19h/00:00:00
(*, 224.0.1.22), 2d19h/stopped, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan322, Forward/Sparse-Dense, 2d19h/00:00:00
Vlan321, Forward/Sparse-Dense, 2d19h/00:00:00
(10.3.22.43, 224.0.1.22), 00:01:57/00:01:49, flags: T
Incoming interface: Vlan322, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan321, Forward/Sparse-Dense, 00:01:57/00:00:00, H, A
(10.3.22.145, 224.0.1.22), 00:02:30/00:01:29, flags: T
Incoming interface: Vlan322, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan321, Forward/Sparse-Dense, 00:02:31/00:00:00, H, A
sh ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
10.3.21.253 Vlan321 v2/SD 1 30 1 10.3.21.253
10.3.22.253 Vlan322 v2/SD 1 30 1 10.3.22.253
#sh ip pim neighbor
PIM Neighbor Table
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
10.3.21.252 Vlan321 1w2d/00:01:20 v2 1 / S
10.3.22.252 Vlan322 1w2d/00:01:30 v2 1 / S
02-20-2009 10:55 PM
Hello Nawaz,
I see that you have enabled CGMP on the L2 switches catos 4006.
to have CGMP to work the L3 switch needs to sends them CGMP frames
in CGMP the routers speaks and the L2 switches listen to on the CGMP L2 multicast address.
I think you need to enable cgmp on vlan21 and vlan22.
use
int vlan x
ip cgmp proxy
Hope to help
Giuseppe
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