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sasskass
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Multicast routing problem, is it possible ?

Thu Nov 03, 2011 11:42 am

Hello,

What i want to do is to "feed" my multicast router (B) form multile RP (router A) over wireless, so that the endpoint router will serve the multicast streams avilable from those RP-s.

The schematics:

Router A:

192.168.2.1
vlan2 multicast source 20 channels RP1 ---
192.168.4.1
---- -----vlan 4 out RP3 -----wireless bridge - (wds1)
192.168.5.1
---- -----vlan 5 out PR4 -----wireless bridge - (wds2
192.168.3.1
vlan3 multicast source 20 channels RP2 ---


PIM setup (router A)
Interfaces:
vlan2, vlan3, vlan4, vlan5 (pim, igmp)

RP (router A) :
192.168.2.1 224.0.0.0/4
192.168.3.1 224.0.0.0/4
192.168.4.1 239.1.0.0/16
192.168.5.1 239.2.0.0/16


-------------------------------------------------------

Router B:

vlan4 in RP1
192.168.4.2
----------------
vlan6 RP3
192.168.6.1
-----------------------
vlan5 in RP2
192.168.5.2
---------------


PIM setup (router B)
interfaces:
vlan4, vlan5, vlan6 (pim, igmp)

RP (router B) :
192.168.4.1 239.1.0.0/16
192.168.5.1 239.2.0.0/16
192.168.6.1 224.0.0.0/4


-----------------------------------------------------


The problem

Everything is working except behind router B-s vlan6 No stream is coming out from vlan6. Sometime one or 2 channels are working randomly.

Maybe anyone have done multicast routing using multiple routers. The solution to just send all the streams to router B is not acceptable.

Kind Regards

Aleksander
 
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janisk
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Posts: 6263
Joined: Tue Feb 14, 2006 9:46 am
Location: Riga, Latvia

Re: Multicast routing problem, is it possible ?

Thu Nov 03, 2011 1:47 pm

in multicast cloud using PIM-SM you have only 1 RP. Also, it does not make any sense to have several, since all the stream swill send data over to RP all the time. All the join requests to IGMP group will be sent to that RP.
 
sasskass
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Re: Multicast routing problem, is it possible ?

Thu Nov 03, 2011 2:10 pm

Hello,

The Mikrotik wiki example is:

Sender -- (subnet I) --> Router A -- (subnet II) --> Router B -- (subnet III) --> Receiver


My scenario is:

Sender -- (subnet I) --> Router A -- (subnet II) --> Router B -- (subnet III) --> (subnet IV)Receiver


Till subnet III everything is working, also if i use igmp proxy instead of PIM but cause the igmp proxy is limited in upstream interfaces to max 1, i cant use it.


Kind Regards

Aleksander
 
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janisk
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Posts: 6263
Joined: Tue Feb 14, 2006 9:46 am
Location: Riga, Latvia

Re: Multicast routing problem, is it possible ?

Thu Nov 03, 2011 4:19 pm

you have to have configured layaer3 network. MRIB will take routes from routing table. If there are some problem (like NAT) in the middle, you can adjust MRIB so include routes to networks behind nat as that sometimes could cause problems.

also note that in your network you choose one RP for one multicast group, that will receive the streams, after that configure all the rest of the routers to point in correct directions so RPs can be reached. and MRIB should contain routing information how to reach RP (or all RPs).

Note that there can only be 1 RP for same multicast (IGMP) group in your multicast cloud.

Note - better go with static configuration. And when you have set up the routers with multicast, __reboot__ them and then check if everything is working.
 
sasskass
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Re: Multicast routing problem, is it possible ?

Thu Nov 03, 2011 5:35 pm

Thanks for advise,

I will try to make everything again, step by step, the only thing i cant do is to reboot an source router, cause it is in production, but

Thanks anyway.

Kind Regards

Aleksander
 
sasskass
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Re: Multicast routing problem, is it possible ?

Thu Nov 03, 2011 9:15 pm

Tahnk You Janisk...

Everything is working, the problem was the RP address of router (B) 224.0.0.0/4 instead it is nessecary to more detalically specify for example 239.0.0.0/16


Thank you, and everybody go to IpTV to fight against big companies!!!! You can feed the endpoint over multiple wireless links !!!

I love Mikrotik OS ,Love Latvia!...

Kind Regards

... Will go to Jurmala tonight with my family... :)

Aleksander ;)

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