Why did you use a deny clause in the access list (only allowing the required 
groups should be enough)?
As I remember (i could be wrong); all groups denied in the access list will be 
used in dense mode.


> Date: Mon, 25 Mar 2013 23:02:54 +0300
> From: [email protected]
> To: [email protected]
> Subject: [OSL | CCIE_RS] MAPPING AGENT filtering RP's
> 
> Hi all.
> 
> i have a basic topology ... R3------R1
> 
> R3  is  advertising himself  as  rp  for complete block ...
> ip  pim  send-rp-announce  lo 0 scope 10  interval  5
> 
> R1  the mapping agent ..wants  to  filter  groups from R3 ...ie  R3 sould
> only  service  232.0.0.0   7.255.255.255
> 
> so  here what i did  on R1  the MA
> R1#conf t
> Enter configuration commands, one per line.  End with CNTL/Z.
> 
> R1(config)#access-list 2 deny 224.0.0.0 7.255.255.255
> 
> R1(config)#access-list 2 permit 232.0.0.0 7.255.255.255
> R1(config)#exit
> 
> 
> ip pim autorp listener
> ip pim send-rp-discovery FastEthernet0/0 scope 10
> ip pim rp-announce-filter rp-list 1 group-list 2
> 
> R1#show ip pim rp map
> 
> PIM Group-to-RP Mappings
> This system is an RP-mapping agent (FastEthernet0/0)
> R1#show ip pim rp map
> 
> PIM Group-to-RP Mappings
> This system is an RP-mapping agent (FastEthernet0/0)
> 
> R1#show access-lists
> Standard IP access list 1
>     10 permit 13.0.0.3 (140 matches)
> 
> Standard IP access list 2
>     10 deny   224.0.0.0, wildcard bits 7.255.255.255 (20 matches)
>     20 permit 232.0.0.0, wildcard bits 7.255.255.255
> 
> As  you can  see   denying  only  a  subset of  224.0.0.0  is making it
> deny  complete block ...
> 
> is  this  normal  behavior  ??
> 
> Can any  one try  the same requirmnet and  see  if  it   works
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