IPv4 Multicast

Wed May 26 14:09:42 UTC 2010

Woot! It was the TTL on the VLC sender that was on default, changed it to 10
and now and I have my video.

Thanks for your help.

  _____  

From: Everton Marques [mailto:everton.marques at gmail.com] 
Sent: mercredi 26 mai 2010 15:42
To: Rens
Cc: Jamie Sobczyk; nanog at nanog.org
Subject: Re: IPv4 Multicast

Does "show ip mroute count" on the 1841 (RP) display activity on traffic
counters?

Is the VLC sender directing multicast to the 1841 (RP) thru a default route?

Is the VLC sender issuing multicast packets with a high-enough multicast TTL
?

Everton

On Wed, May 26, 2010 at 10:21 AM, Rens <rens at autempspourmoi.be> wrote:

I have all those things you mentioned below.
The VLC server (10.0.1.2) sends out 2 streams on 239.255.0.1 & 239.255.0.2
I see both in SAP, when I try to join 239.255.0.2, nothing happens in VLC
and below you have the output of my routers & switches at that time:

On my RP router I see for show ip mroute:

(*, 239.255.255.255), 5d04h/00:03:26, RP 172.16.0.2, flags: SJCL

 Incoming interface: Null, RPF nbr 0.0.0.0
 Outgoing interface list:

   FastEthernet0/1, Forward/Sparse, 1d06h/00:03:26
   FastEthernet0/0.200, Forward/Sparse, 5d04h/00:02:41

(10.0.1.2, 239.255.255.255), 1d06h/00:03:28, flags: LT
 Incoming interface: FastEthernet0/0.200, RPF nbr 0.0.0.0
 Outgoing interface list:
   FastEthernet0/1, Forward/Sparse, 1d06h/00:03:26

(*, 239.255.0.2), 00:01:10/00:03:19, RP 172.16.0.2, flags: S

 Incoming interface: Null, RPF nbr 0.0.0.0
 Outgoing interface list:

   FastEthernet0/1, Forward/Sparse, 00:01:10/00:03:19

(*, 239.255.255.250), 00:07:19/00:03:07, RP 172.16.0.2, flags: S

 Incoming interface: Null, RPF nbr 0.0.0.0
 Outgoing interface list:

   FastEthernet0/1, Forward/Sparse, 00:07:22/00:03:03

(*, 239.195.255.255), 1d06h/00:02:39, RP 172.16.0.2, flags: S

 Incoming interface: Null, RPF nbr 0.0.0.0
 Outgoing interface list:

   FastEthernet0/1, Forward/Sparse, 00:01:24/00:02:39

(*, 224.2.127.254), 5d04h/00:03:10, RP 172.16.0.2, flags: SJCL

 Incoming interface: Null, RPF nbr 0.0.0.0
 Outgoing interface list:

   FastEthernet0/1, Forward/Sparse, 1d06h/00:03:10
   FastEthernet0/0.200, Forward/Sparse, 5d04h/00:02:38

(*, 224.0.1.40), 5d04h/00:02:40, RP 172.16.0.2, flags: SJCL

 Incoming interface: Null, RPF nbr 0.0.0.0
 Outgoing interface list:

   FastEthernet0/1, Forward/Sparse, 1d06h/00:02:59
   FastEthernet0/0.200, Forward/Sparse, 5d04h/00:02:40

On my other router I have:

(*, 239.255.255.255), 5d04h/stopped, RP 172.16.0.2, flags: SJCL
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 5d04h/00:02:54

(10.0.1.2, 239.255.255.255), 1d06h/00:02:58, flags: LJT
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 1d06h/00:02:54

(*, 239.255.0.2), 00:01:55/00:02:56, RP 172.16.0.2, flags: SJC
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 00:01:55/00:02:56

(*, 239.255.255.250), 00:08:04/00:02:53, RP 172.16.0.2, flags: SJC
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 00:08:04/00:02:53

(*, 239.195.255.255), 5d04h/00:02:50, RP 172.16.0.2, flags: SJC
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 00:02:08/00:02:50

(*, 224.2.127.254), 5d04h/00:02:48, RP 172.16.0.2, flags: SJCL
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 5d04h/00:02:48

(*, 224.0.1.40), 5d04h/00:02:52, RP 172.16.0.2, flags: SJCL
 Incoming interface: FastEthernet0/1, RPF nbr 192.168.0.2
 Outgoing interface list:
   FastEthernet0/0.200, Forward/Sparse, 5d04h/00:02:52

On the switch where the RP is connected:

Vlan      Group          Version     Port List
---------------------------------------------------------
200       224.0.1.40     v2          Gi2/24
200       224.2.127.254  v2          Gi2/24
200       239.255.255.255v2          Gi2/24

On the switch where the receiver is connected:

Vlan      Group                    Type        Version     Port List
-----------------------------------------------------------------------

200       224.0.1.40               igmp        v2          Gi0/24
200       224.2.127.254            igmp        v2          Gi0/1, Gi0/24
200       239.195.255.255          igmp        v2          Gi0/1, Gi0/24
200       239.255.0.2              igmp        v2          Gi0/1, Gi0/24
200       239.255.255.250          igmp        v2          Gi0/2, Gi0/24
200       239.255.255.255          igmp        v2          Gi0/1, Gi0/24

-----Original Message-----
From: Jamie Sobczyk [mailto:lanson9 at cox.net]
Sent: vendredi 21 mai 2010 16:52
To: rens at autempspourmoi.be
Cc: nanog at nanog.org

Subject: RE: IPv4 Multicast

Make sure you have
"ip multicast-routing"
on both routers.

On the router interfaces, make sure you have
"ip pim sparse-mode"

On both routers, make sure you have the same rp address assigned and
that you can ping this ip address from both routers. (I prefer to make
it a loopback interface)
"ip pim rp-address w.x.y.z"

Also, make sure that routing is setup on your routers so that your
receiver can ping your sender.

On your routers you should be able to see the source unicast address and
multicast address by typing "show ip mroute"
you should see something like this:
(*, 239.192.3.47), 7w0d/00:02:59, RP 10.31.0.1, flags: S
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Port-channel15, Forward/Sparse, 7w0d/00:02:59, H

(10.5.9.51, 239.192.3.47), 4w5d/00:03:27, flags: TA
  Incoming interface: Port-channel15, RPF nbr 10.7.193.138
  Outgoing interface list:
    Port-channel17, Forward/Sparse, 4w5d/00:02:49, H

On your switches, with igmp snooping enabled, you should be able to
type:
"show ip igmp snooping group" and see something like
Vlan      Group                    Type        Version     Port List
-----------------------------------------------------------------------
24        239.192.3.47             igmp        v2          Gi1/0/21
That port listed is the port of the requester.

-----Original Message-----
I have setup a lab for this multicast.

VLC receiver - 3560G - 1841 - 1841 - 4503 - VLC sender

The 2 switches only provide L2 access, they have IGMP snooping active

On both 1841's I have pim parse-mode & sap listen on all interfaces +
configured a static RP, the one closest to the sender.

With my VLC receiver I can see the channels via SAP, but when I join the
multicast group I don't receive anything.

Could someone help me to troubleshoot this?

Thanks in advance,

Rens