From: Richard Dumoulin (richard.dumoulin@vanco.es)
Date: Sat Apr 17 2004 - 17:57:53 GMT-3
Auto-RP
R1 manda sus RP "annoucements" al "mapping agent" R3 con IP destino
224.0.1.39 --> luego hay que verificar en R3 si hay rpf failures.
R3 manda sus RP "discoveries" a todos los PIM routers con IP destino
224.0.1.40 --> verificar en R1 si hay rpf failure
Este trafico se recibe en "PIM dense mode" --> luego hay que verificar los
rpf failures
BSR (http://www.faqs.org/rfcs/rfc2362.html
<http://www.faqs.org/rfcs/rfc2362.html> )
El BSR candidate R3 manda sus mensajes BSR (forma parte de PIM) hacia la IP
destino 224.0.0.13 (PIM) "hop by hop" .
El RP candidate manda sus mensajes al BSR elegido hacia la IP unicast del
BSR.
Este trafico es znicamente trafico PIM --> aqum los mensajes son hop by hop
luego no hay problema de rpf failure
Creo que he contestado a tu pregunta: "La regla de RPF se aplica tanto a BSR
como a Auto-RP y si BSR funciona sin
necesidad de poner "ip mroute", ?por qui no va a funcionar Auto-RP?"
Aqum va la pagina Multicast de Cisco,
http://www.cisco.com/cgi-bin/Support/browse/psp_view.pl?p=Technologies:Multi
cast&viewall=true
<http://www.cisco.com/cgi-bin/Support/browse/psp_view.pl?p=Technologies:Mult
icast&viewall=true>
--Richard
Como ves no funcionan de la misma manera
-----Original Message-----
From: David Hurtado [mailto:dei2viccie@hotmail.com
<mailto:dei2viccie@hotmail.com> ]
Sent: sabado, 17 de abril de 2004 21:57
To: Richard Dumoulin
Subject: RE: Auto-RP vs BSR
Hola Richard,
Acabo de leer tu correo y ya he terminado el lab (es que lo he hecho por
internet, ya sabes, rack rental), pero yo no creo que esa sea la razsn.
Comprobi la tabla de rutas para ver si se cumplma el RPF y creo que estaba
bien (ahora estoy dudando)
La regla de RPF se aplica tanto a BSR como a Auto-RP y si BSR funciona sin
necesidad de poner "ip mroute", ?por qui no va a funcionar Auto-RP?
?Sabes de algzn enlace donde expliquen o comparen Auto-RP y BSR?
Tampoco me queda claro por qui el RP Mapping Agent tiene que ser el hub en
una topologma hub-and-spoke, quizas sea por el split-horizon.
Muchas gracias por la ayuda y el interis Richard
>From: Richard Dumoulin <richard.dumoulin@vanco.es>
>To: David Hurtado <dei2viccie@hotmail.com>
>Subject: RE: Auto-RP vs BSR
>Date: Sat, 17 Apr 2004 20:18:43 +0100
>
>Funcions ?
>
>-----Original Message-----
>From: Richard Dumoulin
>Sent: sabado, 17 de abril de 2004 20:20
>To: 'David Hurtado'; '=SMTP:ccielab@groupstudy.com'
>Subject: RE: Auto-RP vs BSR
>
>
>David,
>Try debug ip mpacket on R1, you should be seeing rpf check failures.
>Then depending on what rpf check is failing you will probably have to
>configure an ip mroute command on R1. I guess you will need something
>like "ip mroute R3_ip_address 255.255.255.255 toward R2".
>
>
>--Richard
>
>-----Original Message-----
>From: David Hurtado [mailto:dei2viccie@hotmail.com
<mailto:dei2viccie@hotmail.com> ]
>Sent: sabado, 17 de abril de 2004 17:00
>To: ccielab@groupstudy.com
>Subject: Auto-RP vs BSR
>
>
>Hello everybody,
>
>I have been configuring Auto-RP and BSR in the following topology:
>
>(R1)---FR----s1(R2)s0----FR----(R3)
>
>I wanted R1 to be the RP for 224.0.0.0/5 and R2 to be the RP for
>232.0.0.0/5. There is no split horizon limitation in this topology
>because R2 uses 2 different interfaces.
>
>When configuring BSR:
>
>- R3: BSR candidate
>- R2, R1: RP candidates
>
>Everything worked great with BSR.
>
>
>When configuring Auto-RP:
>
>- R3: RP Mapping Agent
>- R2, R1: RP candidates
>
>Only R2 could become RP. R1's announcement didn't come to R3.
>
>I had to create a tunnel between R1 and R3 to take the R1's
>announcements
>to
>
>R3 and then everything worked.
>
>
>Now i would like to show you my deductions in order to be corrected:
>
>BSR in a NBMA network allows communication between BSR and RP candidate
>without sharing the same Layer 2 segment.
>
>BSR in a NBMA network doesn't allow communication between RP Mapping
>Agent and RP candidate without sharing the same Layer 2 segment.
>
>But then why a tunnel will solve this requirement?
>
>I would like to read more about this topic. Could somebody tell me
>about a good link that explains and compares Auto-RP and BSR?
>
>Thanks a lot for your help
>
>_________________________________________________________________
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