IP layer and layer 2 IGMP Snooping

IP layer and layer 2 IGMP Snooping
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Subject Author Date
IP layer and layer 2 IGMP Snooping vicky 06-07-2008
Posted by Albert Manfredi on June 11, 2008, 11:14 am
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> One more thing i want to ask
>
> 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.

In transmission, and in reception. Yes. As explained in RFC 1112.

Bert

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Posted by vicky on June 11, 2008, 2:38 pm
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>
>
>
>
>
> > One more thing i want to ask
>
> > 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.
>
> In transmission, and in reception. Yes. As explained in RFC 1112.
>
> Bert- Hide quoted text -
>
> - Show quoted text -

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

My new query is related to registration in a mulicasting group so for
i m taking a case

For exp

> let 's say there are 10 pc's (hosts)
> one multicasting router
> a layer 2 switch (IGMP Snooping capable) is in between the hosts and rou=
ter
> out of 10 hosts 5 will register in a multicasting group and another will =
register in another multicasting group
> but there each registration time is not same (one sent membership request=
at one time another send its group
registration in an another time)
> Now what the data to be multicast (by router) is at time (let at 2 pm)

so registration for different multicast group is sent by hosts is some
before

So my question is if by one host the registration is sent some hours
before as well as by anther one is few minutes before the fix time of
multicast data is flow by router , so how the layer 2 switch manages
there (hosts) table ?

Vikrant

Posted by Albert Manfredi on June 11, 2008, 4:17 pm
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> My new query is related to registration in a mulicasting group so for
> i m taking a case
>
> For exp
>
> > =A0let 's say there are 10 pc's (hosts)
> > =A0one multicasting router
> > =A0a layer 2 switch (IGMP Snooping capable) =A0is in between the hosts a=
nd router
> > =A0out of 10 hosts 5 will register in a multicasting group and another w=
ill register in another multicasting group
> > =A0but there each registration time is not same (one sent membership req=
uest at one time another send its group
>
> =A0 =A0 registration in an another time)
>
> > =A0Now what the data to be multicast (by router) is at time (let at 2 pm=
)
>
> so registration for different multicast group is sent by hosts is some
> before
>
> So my question is if by one host the registration is sent some hours
> before as well as by anther one is few minutes before the fix time of
> multicast data is flow by router , so how the layer 2 switch manages
> there (hosts) table =A0?

The IGMP snooping switch must send "join" messages to the router if
there is at least one host connected to that switch wants to join the
multicast group. So as soon as that first host joins, the multicasts
reach the switch.

But the snooping switch also keeps track of each individual host that
indicates it wants to join the group, and only forwards the multicast
packets on THOSE ports. And it also keeps track of the leave messages,
to stop forwarding to particular switch ports.

So, no problem if hosts join late or leave early.

Read

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

Bert

Posted by vicky on June 26, 2008, 4:01 am
If you were  Registered and logged in, you could reply and use other advanced thread options
>
>
>
>
>
> > My new query is related to registration in a mulicasting group so for
> > i m taking a case
>
> > For exp
>
> > > =A0let 's say there are 10 pc's (hosts)
> > > =A0one multicasting router
> > > =A0a layer 2 switch (IGMP Snooping capable) =A0is in between the host=
s and router
> > > =A0out of 10 hosts 5 will register in a multicasting group and anothe=
r will register in another multicasting group
> > > =A0but there each registration time is not same (one sent membership =
request at one time another send its group
>
> > =A0 =A0 registration in an another time)
>
> > > =A0Now what the data to be multicast (by router) is at time (let at 2=
pm)
>
> > so registration for different multicast group is sent by hosts is some
> > before
>
> > So my question is if by one host the registration is sent some hours
> > before as well as by anther one is few minutes before the fix time of
> > multicast data is flow by router , so how the layer 2 switch manages
> > there (hosts) table =A0?
>
> The IGMP snooping switch must send "join" messages to the router if
> there is at least one host connected to that switch wants to join the
> multicast group. So as soon as that first host joins, the multicasts
> reach the switch.
>
> But the snooping switch also keeps track of each individual host that
> indicates it wants to join the group, and only forwards the multicast
> packets on THOSE ports. And it also keeps track of the leave messages,
> to stop forwarding to particular switch ports.
>
> So, no problem if hosts join late or leave early.
>
> Read
>
> http://www.ietf.org/rfc/rfc4541.txt?number=3D4541
>
> Bert- Hide quoted text -
>
> - Show quoted text -

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


Hello

Can u plz tell me about the DA (Destination Mac Address) and SA
(Source mac Address)

of a frame which contains multicast data (or multicast member ship
requist or leave requist)

is at this case is DA =3D=3D SA
or SA contain a unique mac address of either router or host.

Please tell me

Thanks in advance


Vikrant

Posted by vicky on July 2, 2008, 6:16 am
If you were  Registered and logged in, you could reply and use other advanced thread options
>
>
>
>
>
> > My new query is related to registration in a mulicasting group so for
> > i m taking a case
>
> > For exp
>
> > > =A0let 's say there are 10 pc's (hosts)
> > > =A0one multicasting router
> > > =A0a layer 2 switch (IGMP Snooping capable) =A0is in between the hosts=
and router
> > > =A0out of 10 hosts 5 will register in a multicasting group and another=
will register in another multicasting group
> > > =A0but there each registration time is not same (one sent membership r=
equest at one time another send its group
>
> > =A0 =A0 registration in an another time)
>
> > > =A0Now what the data to be multicast (by router) is at time (let at 2 =
pm)
>
> > so registration for different multicast group is sent by hosts is some
> > before
>
> > So my question is if by one host the registration is sent some hours
> > before as well as by anther one is few minutes before the fix time of
> > multicast data is flow by router , so how the layer 2 switch manages
> > there (hosts) table =A0?
>
> The IGMP snooping switch must send "join" messages to the router if
> there is at least one host connected to that switch wants to join the
> multicast group. So as soon as that first host joins, the multicasts
> reach the switch.
>
> But the snooping switch also keeps track of each individual host that
> indicates it wants to join the group, and only forwards the multicast
> packets on THOSE ports. And it also keeps track of the leave messages,
> to stop forwarding to particular switch ports.
>
> So, no problem if hosts join late or leave early.
>
> Read
>
> http://www.ietf.org/rfc/rfc4541.txt?number=3D4541
>
> Bert- Hide quoted text -
>
> - Show quoted text -

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Hello Sir

can u plz tell me about

IGMP and GMRP

and if we r using IGMP Snooping at l2 switch , then we 've
a requirment of GMRP also.

Thanks in advance

Vikrant

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