From: Wes Smith (wesmith@rogers.com)
Date: Fri Apr 02 2004 - 12:49:44 GMT-3
Hi Scott
It applies to any multicast address, not just the 239.x.x.x range.
You need to understand how the "*filter-autorp"* sub-command works with
pim auto-rp announcements..
If the filter acl matches any part of group's announcement, the entire
announcement is deleted.
For example, . You are using autorp or pim bootstrap to announce the
whole mcast range via one RP.
The acl on the rp looks like this, "access-list 1 perm 224.0.0.0
15.255.255.255"
and the rp will send a single announcement for the whole range.
Your task is to prevent 239.0.0.0 from leaving the local campus, so you
use the 'mulicast boundary' command
The acl would like like this ... 'access-list 2 deny 239.0.0.0
0.255.255.255'
However, since your RP is only announcing 224.0.0.0/4 .
Since 239.0.0.0/8 is contained inside 224.0.0.0/4 ... the boundary
command will delete the whole 224.0.0.0 range.
To fix this ..
Change your RP to announce the 239.0.0.0/8 range as well. Like this.
access-list 1 perm 239.0.0.0 0.255.255.255
access-list 1 perm 224.0.0.0 15.255.255.255
In you're going to use boundary filter at the edge, you have to
enumerate all the multicast ranges on the RP
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr_c/ipcpt3/1cfmulti.htm#1002581
Hope I haven't confused things more
Wes
Scott, Tyson C 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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