From: Wes Smith (wesmith@rogers.com)
Date: Fri Apr 02 2004 - 13:06:51 GMT-3
Tyson
It's a wording issue.
239.0.0.0 is the same as 10.0.0.0 , 192.168.0.0 etc. They are for use
inside an org, and shouldn't appear on the public net.
But the multicast boundary command lets's you 'administratively scope'
whatever groups you want.
Wes
Scott, Tyson C wrote:
>But Craig you are also stating what my question is. The groups you are
>stating are what I understand as administratively scoped addresses. In
>some of the practice labs I have done they have used the boundary
>command to block addresses in the 224.0.0.0/8 range. From what I
>understand this is not in the administratively scoped range. So am I
>wrong or is the help topic in IOS wrong?
>
>R4(config-if)#ip multicast ?
>
>Boundary Boundary for administratively scoped multicast addresses
>
>Regards,
>
>Tyson Scott
>
>-----Original Message-----
>From: Craig Dorry [mailto:chdorry@yahoo.com]
>Sent: Friday, April 02, 2004 7:33 AM
>To: Scott, Tyson C; ccielab@groupstudy.com
>Subject: Re: Multicast Boundary command
>
>Tyson - I think you are misinterpreting the
>"administratively scoped" addresses. I have used the
>boundary command in the following way:
>Multiple campuses running multicast, so we defined 3
>"administrative scopes" (3 different blocks of
>multicast addresses) from the 239.0.0.0/8 block of
>addresses - campus local (never leaves the campus),
>regional (stays within the United States), and global.
> The boundary was applied to the "campus local" which
>is multicast groups where all sources and receivers
>are at the same physical campus. In this case we used
>the same scope for all campus local multicast at each
>campus. So on the connections from the Campus to the
>MAN we used the ip multicast boundary 1 command, and
>then defined access-list 1 deny 239.1.0.0 0.0.255.255
>and permit everything else. (239.1.0.0/16 groups were
>to never leave the campus)
>
>Hope this helps.
>
>--- "Scott, Tyson C" <tyson.scott@hp.com> wrote:
>
>
>>Group,
>>
>> I am confused as to the topic of the use
>>of Boundary with
>>Multicast. When you use the help from IOS it says
>>it is for
>>administratively scoped Multicast addresses. I
>>thought the
>>administratively scoped addresses where 239.0.0.0 to
>>239.255.255.255.
>>So does this command only apply to this range or is
>>the help menu
>>misleading?
>>
>>
>>
>>R4(config-if)#ip multicast ?
>>
>>Boundary Boundary for administratively scoped
>>multicast addresses
>>
>>
>>
>>Regards,
>>
>>Tyson Scott
>>
>>
>>
>>
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