I'm building a multicast network and one of the question I have is if I should configure PIM interfaces in sparse-dense mode or simply sparse-mode. FYI, i'm planning to use PIMv2 and BSR to elect RP.
With PIMV2/BSR, why do I need to setup PIM i/f in sparse-dense mode as recommended in the config guide.
Also, I understand that using the mixed mode, the leafs routers (the ones connected to receiver's segment) may switch over Shared Tree to Shortest Path Tree if both paths to the source aren't the same. The document recommend to configure a SPT delay to prevent this. Why, just not using SM only. That way, leaf router will never find to real source. Am I right ?
Do we met some problems, or lose something, with configuring PIM sparse mode only?
To answer the second part of your post. Even with PIM Sparse mode receiving routers will still create a SPT to the source rather than via the RP (altho the SPT may go through the RP). The idea behind this is to avoid suboptimal paths from source to receiver.
When to switch across to the SPT is not actually specified so Cisco immediately switch across to an SPT as soon as the first packet is received on the Shared Tree.
So whether you use PIM Sparse or PIM Sparse-dense mode SPT's will still be used.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.