Gert Doering wrote:
Hi,
On Mon, Sep 01, 2008 at 11:45:06AM -0400, Mike Louis wrote:
Do most sp these days support mc in their networks for customers?
Do you know *any* SPs these days that support multicast?
Yes, there are a few that have it still turned on, but does that mean
it's a first grade, fully supported, product?
We disabled external multicasting in our SP network last week - because
there was only minimal customer demand in the last 6 or 7 years, and
on those few occasions, I usually spent ages diagnosing black hole
issues at one of our upstreams (turned up a new line, forgot to enable
PIM on it, and such things).
IPv4 multicast is extremely painful to debug. The whole MSDP/MBGP/PIM
model is too complicated to maintain and too brittle for stable operations
(SSM might be better - we never tried).
SSM is certainly *easier* to troubleshoot as is IPv6 embedded RP.
I wouldn't say they're "good" though; a large portion of the issues I've
run into are much more general e.g. firewalls, lack of IGMP forwarding,
lack of layer2 support, TTL problems, MTU problems, etc.
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