[c-nsp] Need help with setting up ip multicast routing...correction

Mon Oct 11 16:35:24 EDT 2010

If the switch doesn't provide layer 3 services (routing) itself, but is really a l2 switch, then you don't need multicast routing / pim, etc...However, you should have igmp snooping on.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Steven Pfister
Sent: Monday, October 11, 2010 4:14 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Need help with setting up ip multicast routing...correction

Thanks for your help... I think I almost got it but I'm running into a problem. It turns out the encoders on the remote site aren't connected directly to the 4506, but go to a 2960-48TC-L first. The IOS on that switch doesn't seem to support ip multicast routing and I tried to find one that does (I had to upgrade the switch the servers are connected to). Does the 2960 not support multicast routing? All other switches involved see pim neighbors now.

Steve Pfister
Technical Coordinator, 
The Office of Information Technology
Dayton Public Schools
115 S. Ludlow St. 
Dayton, OH 45402

Office (937) 542-3149
Cell (937) 673-6779
Direct Connect: 137*131747*8
Email spfister at dps.k12.oh.us

>>> John Neiberger <jneiberger at gmail.com> 10/11/2010 11:24 AM >>>
Every routed hop in the path must be running PIM and your layer two
interfaces need to have IGMP enabled.

Let us know how it goes!
John

On Mon, Oct 11, 2010 at 9:15 AM, Steven Pfister <SPfister at dps.k12.oh.us> wrote:
> So, in my configuration that I mentioned, not only the 4506 on the remote site, the central site 4510 and 8540 need PIM enabled (which I think is the case now), but the 3560 needs it as well? I think that may be my problem... I'll look into that.
>
> Steve Pfister
> Technical Coordinator,
> The Office of Information Technology
> Dayton Public Schools
> 115 S. Ludlow St.
> Dayton, OH 45402
>
> Office (937) 542-3149
> Cell (937) 673-6779
> Direct Connect: 137*131747*8
> Email spfister at dps.k12.oh.us 
>
>
>>>> David Barak <thegameiam at yahoo.com> 10/8/2010 4:22 PM >>>
> You will need to have PIM enabled on all of the interfaces between the source and receiver, and all of those devices need to have an RP (and they should be the same: easiest solution is statically enter this on all of them).  Also, make sure that PIM is enabled on the 8840's interface that matches the RP-address.
>
> There's a lot more to optimization and troubleshooting, but that should provide initial connectivity.  Some good tutorials on the subject can be found at http://nanog.org/resources/tutorials/ 
>
> David Barak
> Need Geek Rock?  Try The Franchise:
> http://www.listentothefranchise.com 
>
>
> --- On Fri, 10/8/10, Steven Pfister <SPfister at dps.k12.oh.us> wrote:
>
>> From: Steven Pfister <SPfister at dps.k12.oh.us>
>> Subject: Re: [c-nsp] Need help with setting up ip multicast routing...correction
>> To: cisco-nsp at puck.nether.net 
>> Date: Friday, October 8, 2010, 3:46 PM
>> The line below reading "non-multicast
>> traffic" should be "non-multicast traffic seems to be OK
>> between the vlans"
>>
>> Thanks!
>>
>> Steve Pfister
>> Technical Coordinator,
>> The Office of Information Technology
>> Dayton Public Schools
>> 115 S. Ludlow St.
>> Dayton, OH 45402
>>
>> Office (937) 542-3149
>> Cell (937) 673-6779
>> Direct Connect: 137*131747*8
>> Email spfister at dps.k12.oh.us 
>>
>>
>> >>> "Steven Pfister" <SPfister at dps.k12.oh.us>
>> 10/8/2010 3:39 PM >>>
>>
>> We've got a client who needs to set up multicast routing
>> between two sites (and between two vlans) in order for some
>> video encoders at remote sites to find servers at the
>> central site. I've never had experience with this. The setup
>> looks something like:
>>
>> encoders -> Cisco 4506 -> (CSME) -> Cisco 4510
>> -> Cisco 8540 -> Cisco 3560 -> servers
>>
>> The Cisco 4506 is the default gateway for the remote site
>> vlan, let's call it vlan 22.
>> The Cisco 4510 is the default gateway for the central site
>> vlan, let's call it vlan 33
>>
>> Also factoring into this, a previous (before my time here)
>> set up of ip multicasting in sparse mode was done using
>> other remote sites using 3640 routers with the 8540 as the
>> RP. I don't know what it was intended for, or if it was ever
>> successfully configured, but I'm not sure it's in use any
>> more.
>>
>> Here's what's been done so far... the Cisco 4506 now has:
>>
>> ip multicast-routing
>> ip pim rp-address 10.99.99.1   [the address
>> of the 8540]
>> interface Vlan22
>>    ip pim sparse-dense-mode  [the video
>> encoder vendor recomended this]
>>  [there's also a ip helper-address pointing to a local
>> server for dhcp]
>>
>> The 4510 has:
>>
>> ip multicast-routing
>> ip pim rp-address 10.99.99.1
>> interface Vlan33
>>    ip pim sparse-dense-mode
>>
>> Observations:
>> - non-multicast traffic
>> - the encoders never see the servers
>> - "show ip pim neighbor" shows no results (just headers)
>> - "show ip multi int vlan33" on the central site shows a
>> large and growing number of multicast in packets, but zero
>> out packets. Same results for vlan22 on the remote site.
>>
>> Could the problem be igmp packets not getting exchanged?
>> Like I said, I've never set up ip multicast routing before.
>>
>> Thanks!
>>
>>
>> Steve Pfister
>> Technical Coordinator,
>> The Office of Information Technology
>> Dayton Public Schools
>> 115 S. Ludlow St.
>> Dayton, OH 45402
>>
>> Office (937) 542-3149
>> Cell (937) 673-6779
>> Direct Connect: 137*131747*8
>> Email spfister at dps.k12.oh.us 
>>
>>
>>
>>
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