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Multicast using Cisco IPTV over MPLS

We recently migrated from an ATM network(where our IPTV worked great) to an MPLS network where the IPTV doesn't work right a the remote site - the audio is good but the video keeps freezing. I can provide more information and a diagram but just thought I should put it out first in case someone has run across this.

Note: We have verified a great deal of configs to make sure all is set - the Joins are being formed at the remote sites, the ip sparse-mode commands are configured on the layer 3 interfaces etc etc, igmp is running, the outputs on the layer 3 switches/routers from our routers as well as those from the ISP all look good.

However, I can't figure out why it is freezing!

As a last resort, I am planning on doing a GRE tunnel from my remote router to my HQ router sometime tonight to see if the freezing will stop. If it does then I will know for sure the the ISP needs to fix something in their MPLs cloud.

Question: does anyone know ( or can suggest) something else that I may be missing?  I desperately need this thing to work right.


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Bokis
Asked:
Bokis
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1 Solution
 
harbor235Commented:

Is this a MPLS backbone you manage or is it a service from a provider?

L3VPN or L2VPN?  Ethernet ?

What is your MTU strategy? Hopefully you have developed a sound MTU strategy that accommodates max IP MTU (1518) plus  multiple labels?

What is the max MTU allowed by the provider if applicable?

harbor235 ;}
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BokisAuthor Commented:
The MPLS backbone is managed by ISP only and it is L3VPN
They have MTU limit set to 1420 on all customer edge routers.
On my L3 interfae with them, I have my MTUs set at 1360
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harbor235Commented:


Are you filtering ICMP? Its pretty hard to tell without knowing what your doing. MTU is one of the
most common issues. I assume MTU settings are set on all sites the same and ICMP is not being filtered?  Are you running IPSEC between sites?

harbor235 ;}
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BokisAuthor Commented:
MTU is set the same for all sites.
I am not running IPSEC between sites and not ICMP filtering is configured on my routers.

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harbor235Commented:

Have you performed packet captures on both ends of a flow?

harbor235 ;}
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BokisAuthor Commented:
Yes
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harbor235Commented:


Can you tell me whats happening or can you attach the pcap?

harbor235 ;}
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BokisAuthor Commented:
I will upload the pcap here in a few hours.
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BokisAuthor Commented:
I promised uploading the pcap and will still do so.
Meanwhile, I managed to the GRE tunnel up between my remote and local routers and I am still having the same exact issues!!!
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harbor235Commented:

Try this ping a remote device, adjust the size of the ping packet (default 64 bytes),

"ping -l" for windows, *NIX    "ping -s",   adjust the size up to what you think your mtu is and see when you have troubles. If you can reproduce it everytime then its a mtu issue. If not perhaps there is an application isse.


harbor235 ;}
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BokisAuthor Commented:
PCAP wont Attach...even as a zipped file.
------------------------------

Additional information/observation from troubleshooting efforts.

When I turn on multicast across the WAN, workstations(at HQ) on the same subnet as the broadcast server  do not freeze its video!!!  Every other subnet freezes its video!

Note:I use 6509s t HQ and remote for inter-vlan routing.  Each site has two 6509s configured to operate in HSRP mode for redundancy.  All access switches are brand new 3750 switches. I have about 50vlans at HQ and 10 at remote site.
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BokisAuthor Commented:
I will try the ping/mtu test when I go back to the office this morning.
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BokisAuthor Commented:
I have performed the mtu tests and found no issues.
By the way I am curious how this MTU test or the MTU issues itself would be a source of problem with multicast.
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harbor235Commented:

I am not sure why I did not think of this earlier but does your ISP support multicast over your VPN? Typically, SPs need to offer multicast as a service since native multicast will not work over your L3VPN without enabling this service.

Have you been tal;king to your ISP?

here is some good reference material;

http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fs_mvpn.html

harbor235 ;}
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BokisAuthor Commented:
I will check the link.
Yes I am working with the ISP engineer. Remember that it work, it just freezes. Maybe the ISP need to fix something but I am not sure what.
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BokisAuthor Commented:
I lowered the bandwidth in the Multicast application itself and it worked like a charm.
I will close this question in a few days.
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BokisAuthor Commented:
Multicast-wise, the configuration was perfect. I just had to configure the application to push out at lower bandwidth..which I did nd the issue was resolved.
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