Auto-RP - Multiple Candidate RPs

Can someone help me out with this. I have been racking my brain trying to figure out why the configs in the solution are the way that they are:

R8:
ip access-list standard R8_GROUPS
deny 224.110.110.110
permit 224.0.0.0 7.255.255.255
permit 224.0.0.0 15.255.255.255

R10:

ip access-list standard R10_GROUPS
deny 224.110.110.110
permit 232.0.0.0 7.255.255.255
permit 224.0.0.0 15.255.255.255

and not what I came up with:

ip access-list standard R8_GROUPS
deny 224.110.110.110
permit 224.0.0.0 15.255.255.255
permit 232.0.0.0 15.255.255.255

R10:

ip access-list standard R10_GROUPS
deny 224.110.110.110
permit 232.0.0.0 15.255.255.255
permit 224.0.0.0 15.255.255.255

Comments

  • I just wanted to say I revisited this (probably more times than I care to admit) and the solution guide is indeed correct. The part I was missing to piece this together was the order the ACL was processed in along with how the longest match was taken into account.
    It took some playing around with the ACL's to fully understand what was going on.

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