Buy or Renew
Buy or Renew
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
cancel
Start a conversation
2561
Views
0
Helpful
4
Replies

Problems with multicast across different vlans - picture inside

amarranca
Level 1
Level 1

‎04-08-2011 11:09 PM - edited ‎03-06-2019 04:31 PM

Hi all,

I'm hoping someone can help me with my multicast probelm.  Multicast works fine in one VLAN but I can't get it to span multiple VLANS, heres a low down of my setup and config.

Please see the quick diagram for a reference, this how its configured at the moment - similar fasion to a router on stick enviroment.  Two links from the router go to two differerent switch ports on the switch, each link is in its own VLAN (VLAN 1 and 10)

The Cisco 2600 is acting as the only router and multicast router.  All other aspects of the network work just fine, only multicast traffic cant span multiple VLANS.

2600 rtr.JPG

Here is the config of the Cisco 2600 router

!
!
ip multicast-routing
!
interface Loopback0
ip address 172.16.25.251 255.255.255.0
ip pim sparse-dense-mode
!
interface FastEthernet0/0
description *Data VLAN*
ip address 172.16.24.254 255.255.255.0
ip pim sparse-dense-mode
duplex auto

speed auto
!
interface FastEthernet0/1
description *Voice VLAN*
ip address 10.10.10.1 255.255.255.0

ip pim sparse-dense-mode
duplex auto
speed auto
!

ip pim rp-address 172.16.25.251

The switch has igmp enabled on both VLANS

Here is a snippet from when I do a debug on my ip igmp member:

*Mar  2 09:01:45.322: IGMP(0): Received v2 Report on FastEthernet0/0 from 172.16.24.229 for 239.192.17.61
*Mar  2 09:01:45.326: IGMP(0): Received Group record for group 239.192.17.61, mode 2 from 172.16.24.229 for 0 sources
*Mar  2 09:01:45.326: IGMP(0): Updating EXCLUDE group timer for 239.192.17.61
*Mar  2 09:01:45.326: IGMP(0): MRT Add/Update FastEthernet0/0 for (*,239.192.17.61) by 0

172.16.24.229 is my IP PBX generating the multicast and the multicast address of 239.192.17.61 is the correct address so based on this I can see the traffic hit the router but it just cant make it back out I imagine.

Help?

What else am I missing????

Labels:
0 Helpful
4 Replies 4

Reza Sharifi
Hall of Fame
Hall of Fame

‎04-09-2011 07:34 AM

Hi,

On the switch can you turn on "ip igmp snooping vlan xx"?

Also, where is the source and the receiver?

Reza

0 Helpful

amarranca
Level 1
Level 1
In response to Reza Sharifi

‎04-09-2011 07:39 PM

Both VLANS have "ip igmp high-priority-forward" enabled.

According to the docs I read when you enable ip igmp on the VLAN that basically enables the ip igmp snooping command we are all used too.

I enabled globallly this command on the switch as well:

igmp-proxy-domain "voice" 172.16.24.254 239.192.17.60 239.192.17.62

(24.254 is the "next hop" for the switch and im specifying the multicast range to forward - low and then high.

The multicast SOURCE would be 172.16.24.229 and the devices RECEIVING the multicast would be the IP phones (10.x.x.x)

0 Helpful

Denise "Fish" Fishburne
Cisco Employee
Cisco Employee

‎04-09-2011 08:47 AM

Show ip igmp groups

Show ip mroute

Sent from Cisco Technical Support iPhone App

0 Helpful

amarranca
Level 1
Level 1
In response to Denise "Fish" Fishburne

‎04-09-2011 07:32 PM

RTR#sh ip igmp groups
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
224.0.1.24       FastEthernet0/0          20:52:52  00:02:13  172.16.24.5
224.0.1.40       FastEthernet0/0          20:52:37  00:02:16  172.16.24.254
224.0.1.60       FastEthernet0/0          20:52:53  00:02:13  172.16.24.23
239.192.17.61    FastEthernet0/0          2d03h     00:02:12  172.16.24.229
239.255.255.250  FastEthernet0/0          2d04h     00:02:08  172.16.24.229
239.255.255.254  FastEthernet0/0          2d04h     00:02:10  172.16.24.5

The group I'm interested in I have marked in bold

The PBX's IP is 172.16.24.229, why it shows up twice Im not sure.

RTR#sh ip mroute

IP Multicast Routing Table

Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.0.1.24), 20:55:27/00:02:38, RP 172.16.25.251, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse-Dense, 20:55:27/00:02:38

(*, 224.0.1.40), 1d05h/00:02:38, RP 172.16.25.251, flags: SJCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse-Dense, 20:55:13/00:02:38

(*, 224.0.1.60), 20:55:28/00:02:41, RP 172.16.25.251, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse-Dense, 20:55:28/00:02:41

(*, 239.192.17.61), 2d03h/00:02:33, RP 172.16.25.251, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse-Dense, 1d06h/00:02:33

(*, 239.255.255.250), 2d04h/00:02:27, RP 172.16.25.251, flags: SJCF
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse-Dense, 1d06h/00:02:27

(*, 239.255.255.254), 2d04h/00:02:29, RP 172.16.25.251, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    FastEthernet0/0, Forward/Sparse-Dense, 1d06h/00:02:29

0 Helpful
Customers Also Viewed These Support Documents