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How To Enable Multicast in a Campus Network

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abcd2008

IS-IT--Management
Oct 15, 2008
13
IN
Hi , Can any one help me out of multicast problem...?
My Network Setup is like bellow ---
Users are connected in Stack ( Cisco 3550 0
Cisco STACK connected to Core Switch ( L3/ 3550 )
Core Switch connected to Border Switch ( 3750 )
Border Switch connected to Cisco PIX 515E
PIX connected to Server Access Switch and Voice server connected to Server Switch.
Now User used to login in to WebSymposim Server to view Agent Display how many user currently logged in in the floor and taking calls.
In Web Symposim There is One Link called Agent Display . Whenever user click on that link .. Web Symposim fetch the data from another Server called CCMA.
Both the server are in Same Vlan( Vlan 4 ) created in Server Switch .Multicast is happening between these 2 server .Now all the user vlan created in Core Switch and these VLANs totally seperate from server vlan.If i try to see Agent Display from Server VLAN .. its happening through Multicast. But IF i try this from User Vlan ..its happening through Unicast that i can understand by seeing the "M" & "U" Symbol in the Agent Display report.
The problem is that i want to enable multicast between User Vlan and server vlan. For that i did the following config ======
=========================================================
In Core Switch
==========================
ip multicast-routing
!
int Tunnel 1
Ip address A.A.A.A 255.255.255.255
ip pim sparse-dense-mode
tunnel source Loopback0
tunnel destination <Loopback IP of Server Switch>
!
interface Loopback0
ip address X.X.X.X 255.255.255.255
!
interface Vlan10
ip pim sparse-dense-mode
!
interface Vlan111
ip pim sparse-dense-mode
!
interface Vlan12
ip pim sparse-dense-mode
!
interface Vlan13
ip pim sparse-dense-mode
!
================================
Server Access Switch Config
=================================


ip multicast-routing distributed
!
interface Tunnel1
ip address B.B.B.B 255.255.255.255
ip pim sparse-dense-mode
tunnel source Loopback0
tunnel destination <Loopback Ip of CoreSwitch>
!

interface Loopback1
ip address Y.Y.Y.Y 255.255.255.255
!
interface Vlan4
description ******Voice-Server*******
ip pim sparse-dense-mode
!
=============================================
PIX Config
=============================================
As PIX comes between Core Switch & Server Switch so i have allowed Both side Tunnel & loopback Interface IP bidirection in PIX permiting GRE protocol.
=================================================

Can any body help me out from the problem or can suggest me a config with respect to my network setup ..i will be waiting for this .....
 
Hi alll...
is there anybody who can help me on this ..??
 
how do you know its multicast traffic? have you tried the snoop command?
 
I would contact your vendor for assistance as I highly doubt 2 servers are talking via multicast.
 
1) I would get ride of the sparse-dense-mode and just change it to sparse-mode. Also add the pim sparse-mode to the loopback on your core switch.

2) verify that the tunnel interfaces are pim-neighbors with the "show ip pim neighbors". If they are not, you need to look at the pix for further troubleshooting.

3)add a static RP on both switches,
"ip pim rp-address X.X.X.X" (your lo0 address on your core switch)

4) add a staic mroute on the Server Access switch to route the multicast traffic over the tunnel and avoid RFP failure.

"ip mroute 0.0.0.0 0.0.0.0 tunnel 1"

if this doesnt work, post thr following.

sh ip pim rp mapping
sh ip mroute act
sh ip mroute
sh ip pim nei
sh ip pim mroute count
 
Thanks Jsteve.. i will try this ..if the problef not resolved ..i will come with the sho command output...
 
I was asked to do something similar, but all L3 devices were Cisco switches:

1/ enable Multicast routing on each switch:
Globally "ip multicast-routing"
Interface "ip pim sparse-dense-mode"
- Discovered that I had to upgrade to the enhanced image on my 3750s.

At this point, it still didn't work and it was discovered:
2/ The servers' multicast hop-count was set to a default of "1" and had to be increased.

It then worked OK.
 
Hi VinceWhirlwind
Thankx for sharing your view ..but could you please let me know how did you discover that The servers' multicast hop-count was set to a default of "1" and had to be increased.How did u increage this hop count..

What is the process to find this ..
In my setup all are the cisco 3550 switchs and only 1 is cisco 3560 switch with ipservices image which is server access switch where all the servers connected .Need to enable mcast between user zone and server.

It would be better if u can share your config and the network setup , i.e your mcast source and receiver between whome u enable mcast ..??
 
Hi VinceWhirlwind

My Network Setup is like bellow ---
Users are connected in Stack ( Cisco 3550 ) Which will be MCAST Receiver
Cisco STACK connected to Core Switch ( L3/ 3550 )
Core Switch connected to Border Switch ( L2/3550 )
Border Switch connected to Cisco PIX 515E
PIX connected to Server Access Switch( 3560 ) and Voice server connected to Server Switch.

Is your setup is closely to this .....??


 
You "border" switch should be L3, doing core/distribution (vlans) duties, and the L2 should be the access layer...just a thought...

/
 
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