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Multicast using Cisco IPTV over MPLS

Posted on 2010-11-29
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Last Modified: 2013-12-24
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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Question by:Bokis
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Expert Comment

by:harbor235
ID: 34244670

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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Author Comment

by:Bokis
ID: 34244751
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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Expert Comment

by:harbor235
ID: 34244896


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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Author Comment

by:Bokis
ID: 34244925
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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Expert Comment

by:harbor235
ID: 34244999

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

harbor235 ;}
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Author Comment

by:Bokis
ID: 34246814
Yes
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Expert Comment

by:harbor235
ID: 34248419


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

harbor235 ;}
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Author Comment

by:Bokis
ID: 34253153
I will upload the pcap here in a few hours.
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by:Bokis
ID: 34256446
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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Expert Comment

by:harbor235
ID: 34258494

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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by:Bokis
ID: 34264657
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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by:Bokis
ID: 34264660
I will try the ping/mtu test when I go back to the office this morning.
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Author Comment

by:Bokis
ID: 34312207
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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Expert Comment

by:harbor235
ID: 34312816

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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by:Bokis
ID: 34314030
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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Accepted Solution

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Bokis earned 0 total points
ID: 34422117
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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Author Closing Comment

by:Bokis
ID: 34463352
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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