Mapping class D to Ethernet physical address

Mapping class D to Ethernet physical address
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Subject Author Date
Mapping class D to Ethernet physical address vicky 06-11-2008
Posted by vicky on June 11, 2008, 4:08 am
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Hi,

Is the Multicast IP to mac resolution is done at host pc's end
also.
to make a multicast MAC address


For exp
if multicast ip address is


227.2.3.7


then its mac address


01-00-5e-02-03-07


is made at host pc end , as then it send packet by setting this mac
address to the DA field.


Vikrant


Posted by Albert Manfredi on June 11, 2008, 11:07 am

> Is the Multicast IP to mac resolution =A0 is done at host pc's end
> also.
> to make a multicast MAC address
>
> For exp
> if multicast ip address is
>
> 227.2.3.7
>
> then its mac address
>
> 01-00-5e-02-03-07
>
> is made at host pc end , as then it send packet by setting this mac
> address to the DA field.

Yes. And the host joining a multicast does the same thing, setting its
Ethernet interface to receive frames from the MAC address
01-00-5e-02-03-07.

Bert

Posted by vicky on June 11, 2008, 2:24 pm
>
> > Is the Multicast IP to mac resolution =A0 is done at host pc's end
> > also.
> > to make a multicast MAC address
>
> > For exp
> > if multicast ip address is
>
> > 227.2.3.7
>
> > then its mac address
>
> > 01-00-5e-02-03-07
>
> > is made at host pc end , as then it send packet by setting this mac
> > address to the DA field.
>
> Yes. And the host joining a multicast does the same thing, setting its
> Ethernet interface to receive frames from the MAC address
> 01-00-5e-02-03-07.
>
> Bert

----------------------------------------------------------------------------=
--------------

Thanks Mr Bert

Ok , Is the multicating related enteries which made in layer 2 switch
are always be static or it may be aging bit set , or... the behaviour
of enteries for multicast table in layer 2 switch is depand on the
behaviour or say which type of register support by a switch
controller (either it static or dynamic)

please tell me.......

Posted by Albert Manfredi on June 11, 2008, 4:07 pm

> Ok =A0, Is the multicating related enteries which made in layer 2 switch
> are always be static or it may be aging bit set , or... the behaviour
> of enteries for multicast table in layer 2 switch is depand on the
> behaviour =A0or say which type of register support by a switch
> controller (either it static or dynamic)

Are you talking about IGMP snooping here? If yes, the forwarding of
multicasts to a port times out, as stated in RFC 4541, bottom of page
5. It is also dynamic, though, listening for IGMP leave messages.

Have you read through this yet?

http://www.ietf.org/rfc/rfc4541.txt?number=3D4541

Bert

Posted by vicky on June 12, 2008, 12:47 am
>
> > Ok =A0, Is the multicating related enteries which made in layer 2 switch=

> > are always be static or it may be aging bit set , or... the behaviour
> > of enteries for multicast table in layer 2 switch is depand on the
> > behaviour =A0or say which type of register support by a switch
> > controller (either it static or dynamic)
>
> Are you talking about IGMP snooping here? If yes, the forwarding of
> multicasts to a port times out, as stated in RFC 4541, bottom of page
> 5. It is also dynamic, though, listening for IGMP leave messages.
>
> Have you read through this yet?
>
> http://www.ietf.org/rfc/rfc4541.txt?number=3D4541
>
> Bert

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

No i m taking about the enteries made in layer 2 switch in its
multicast table is what , either it static or dynamic.

Vikrant

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