From: The Great Ryan (pv.ryan@gmail.com)
Date: Sat Oct 15 2005 - 08:47:07 GMT-3
Thanks Arun,
I know that "ip pim nbma" will be helpful when multicast is running in
Frame-relay cloud. When I check the link, It said that multicast is
sent using Broadcast queue on serial interface.
http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800d6b61.shtml
The above link just only describe main interface and poin-to-point example
If the hub router create 2 multipoint subinterface,
1) each sub-interface will have its own broadcast queue ?
2) do I need to place "ip pim nbma" on each sub-interface, or main
interface to make multicast run normally ?
interface Serial 0/0
encapsulation frame-relay
ip pim nbma <-?
!
interface Serial 0/0.1 multipoint
description Connect to RP
ip pim nbma <-?
!
interface Serial 0/0.2 multipoint
description Connect to Router running "ip igmp join-group"
ip pim nbma <-?
Regards,
Ryan
2005/10/15, Arun Arumuganainar <aarumuga@hotmail.com>:
> ip pim nbma if different thing altogether. Lets us take for example a sample
> scenario .
>
> R1 is the hub and r2 & r3 are spoke . R2 alone has client listening to a
> multicast group G . In such a case R1 will forward packet both to r2 and r3
> This will amount to wastage of bandwidth on virtual circuit to R3.
>
> This problem is solved by configuring " ip pim nbma " . When it if turned on
> then in the outgoing interface list as seen in "sh ip mroute " output will
> list spokes ipaddress instead of interface .
>
> Note: You need configure this only when PIM and Multicast routing is
> configured on the router .
>
> Framerelay broadcast queue is entirely different story !!!
>
> By the way what is exact question !!! In case you wanted to discuss the
> specfic thing you wanted to do in Frame-relay we can discuss more about this
> !!!
>
> Thanks and Regards
> Arun
> ----- Original Message -----
> From: "The Great Ryan" <pv.ryan@gmail.com>
> To: "Arun Arumuganainar" <aarumuga@hotmail.com>
> Sent: Saturday, October 15, 2005 8:15 AM
> Subject: Re: Broadcast Queue & Normal Interface Queue in Serial Interface
>
>
> Hi,
>
> My question is related to broadcast queue in frame-relay when running
> multicast
>
> When I check with the following link, I know that serial interface
> (connected to frame-relay cloud) handle normal packet and broadcast in
> different way.
>
> http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800d6
> b61.shtml
>
> If I have a hub router with 2 sub-interfaces, which interface should
> use "ip pim nbma" ?
>
> interface Serial 0/0
> encapsulation frame-relay
> ip pim nbma <-?
> !
> interface Serial 0/0.1 multipoint
> description Connect to RP
> ip pim nbma <-?
> !
> interface Serial 0/0.2 multipoint
> description Connect to Router running "ip igmp join-group"
> ip pim nbma <-?
> !
>
>
> What is the exact usage of "ip pim nbma" ? How it related to broadcast
> queue in frame-relay interface?
>
>
> Thanks for your help!
> Ryan
>
>
>
>
>
>
> 2005/10/14, Arun Arumuganainar <aarumuga@hotmail.com>:
> > Hi Scott and Ryan
> >
> > Broadcasts are handled by a separate software queue in Frame Relay called
> > the Frame Relay broadcast queue. The frame-relay broadcast-queue command
> is
> > used in the interface mode to create a special queue to hold broadcast
> > traffic.
> >
> > Under normal condition there is no need to tune this broadcast Queue . But
> > in cast you network is larger( then number routing protocol updates could
> > be very large ) or you run too much of Multicast data traffic then in
> such
> > a case Routing protocol updates might get tail drops. This may result in
> > inconsistent routing .In such scenarios mandates tuning of this broadcast
> > queue ( I remember doing a exercises on Broadcast Queue in Ex 39 on IP
> > Expert Series 7.0 ).
> >
> > Could you guys confirm whether you are referring Frame-relay broadcast
> queue
> > !!! In case I am wrong pls. do let me know exactly what you are looking
> for
> > ( Exact wording from the questions would be very helpful ) !!!!
> >
> > Thanks and Regards
> > Arun
> >
> > ----- Original Message -----
> > From: "Scott Morris" <swm@emanon.com>
> > To: "'The Great Ryan'" <pv.ryan@gmail.com>
> > Cc: "'Cisco certification'" <ccielab@groupstudy.com>
> > Sent: Friday, October 14, 2005 5:58 PM
> > Subject: RE: Broadcast Queue & Normal Interface Queue in Serial Interface
> >
> >
> > > I suppose that would depend on the topology design. But if it's your
> hub,
> > > I'd say yes.
> > >
> > > The pim nbma mode is a sub-interface command, although its
> classification
> > of
> > > things will affect how the physical interface/hardware queues handle the
> > > traffic.
> > >
> > > Scott
> > >
> > > -----Original Message-----
> > > From: The Great Ryan [mailto:pv.ryan@gmail.com]
> > > Sent: Friday, October 14, 2005 7:57 AM
> > > To: swm@emanon.com
> > > Cc: Cisco certification
> > > Subject: Re: Broadcast Queue & Normal Interface Queue in Serial
> Interface
> > >
> > > Ok,
> > >
> > > If I have the following scenario running multicast, should I enable "ip
> > pim
> > > nbma" on the main interface, on sub-interfaces or All interface?
> > >
> > > interface Serial 0/0
> > > encapsulation frame-relay
> > > ip pim nbma <-?
> > > !
> > > interface Serial 0/0.1 multipoint
> > > description Connect to RP
> > > ip pim nbma <-?
> > > !
> > > interface Serial 0/0.2 multipoint
> > > description Connect to Router running "ip igmp join-group"
> > > ip pim nbma <-?
> > > !
> > >
> > >
> > > If there is only one hardware broadcast queue, only main interface
> should
> > be
> > > applied? I'm really in lose.
> > >
> > > Thanks !
> > > Ryan
> > >
> > > 2005/10/14, Scott Morris <swm@emanon.com>:
> > > > These are hardware queues you are referring to.
> > > >
> > > > Queues in general belong to the physical interface only. Only when
> > > > you employ shaping does a queue get created (in software) for the
> > > sub-interface.
> > > >
> > > > HTH,
> > > >
> > > > Scott
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > > > Of The Great Ryan
> > > > Sent: Friday, October 14, 2005 6:16 AM
> > > > To: Cisco certification
> > > > Subject: Broadcast Queue & Normal Interface Queue in Serial Interface
> > > >
> > > > Hi, Group,
> > > >
> > > > As I know, there are two type of queues in Serial Interface, Broadcast
> > > > Queue & Normal Queue. If I configure multiple-point interface or
> > > > point-to-point interface, the IOS will create another Broadcast/Normal
> > > > Queue for these subinterface?
> > > >
> > > > e.g.
> > > > interface Serial 0/0
> > > > encapsulation frame-relay
> > > > interface Serial 0/0.1 multipoint
> > > > interface Serial 0/0.2 point-to-point
> > > >
> > > > How many queues in Serial 0/0?
> > > > 1 broadcast & 1 Normal queue for each subinterface ?
> > > >
> > > >
> > > > Thanks
> > > > Ryan
> > > >
> > > > ______________________________________________________________________
> > > > _ Subscription information may be found at:
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