Configure PIM sparse mode on routers R1, R2, and R3 on subnets 1.1.3.0, 1.1.23.0, and 1.1.124.0. R3's FastEthernet0/0 segment should join IGMP groups 238.0.0.1 and 226.0.0.1. Configure R2 to be the RP for groups 238.0.0.1 - 238.255.255.255. Configure R1 to be the RP for all other groups between 226.0.0.0-239.255.255.255. R2 should be the mapping agent. Do not use PIMv2. Use the least amount of lines for any required access lists.
Highlight below for the solution:
Solution:
R3:
ip multicast-routing
ip pim autorp listener
interface FastEthernet0/0
ip pim sparse-mode
ip igmp join-group 238.0.0.1
ip igmp join-group 226.0.0.1
interface Serial1/3
ip pim sparse-mode
R2:
ip multicast-routing
ip pim autorp listener
access-list 22 permit 238.0.0.0 0.255.255.255
interface Serial0/1
ip pim sparse-mode
interface FastEthernet0/0
ip pim sparse-mode
interface Loopback0
ip pim sparse-mode
ip pim send-rp-announce loopback0 scope 250 group-list 22
ip pim send-rp-discovery loopback 0 scope 250
access-list 2 permit host 2.2.2.2
access-list 1 permit host 2.2.1.1
access-list 11 deny 224.0.0.0 1.255.255.255
access-list 11 deny 238.0.0.0 0.255.255.255
access-list 11 permit 224.0.0.0 15.255.255.255
ip pim rp-announce-filter rp-list 2 group-list 22
ip pim rp-announce-filter rp-list 1 group-list 11
R1:
ip multicast-routing
ip pim autorp listener
interface FastEthernet0/0
ip pim sparse-mode
interface Loopback0
ip pim sparse-mode
access-list 11 permit 226.0.0.0 1.255.255.255
access-list 11 permit 228.0.0.0 3.255.255.255
access-list 11 permit 232.0.0.0 3.255.255.255
access-list 11 permit 236.0.0.0 1.255.255.255
access-list 11 permit 239.0.0.0 0.255.255.255
ip pim send-rp-announce loopback0 scope 250 group-list 11
Confirmation:
R2#show ip pim rp map
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent (Loopback0)
Group(s) 226.0.0.0/7
RP 2.2.1.1 (?), v2v1
Info source: 2.2.1.1 (?), elected via Auto-RP
Uptime: 00:01:07, expires: 00:00:08
Group(s) 228.0.0.0/6
RP 2.2.1.1 (?), v2v1
Info source: 2.2.1.1 (?), elected via Auto-RP
Uptime: 00:01:07, expires: 00:00:08
Group(s) 232.0.0.0/6
RP 2.2.1.1 (?), v2v1
Info source: 2.2.1.1 (?), elected via Auto-RP
Uptime: 00:01:07, expires: 00:00:08
Group(s) 236.0.0.0/7
RP 2.2.1.1 (?), v2v1
Info source: 2.2.1.1 (?), elected via Auto-RP
Uptime: 00:01:07, expires: 00:00:08
Group(s) 238.0.0.0/8
RP 2.2.2.2 (?), v2v1
Info source: 2.2.2.2 (?), elected via Auto-RP
Uptime: 00:01:06, expires: 00:00:08
Group(s) 239.0.0.0/8
RP 2.2.1.1 (?), v2v1
Info source: 2.2.1.1 (?), elected via Auto-RP
Uptime: 00:01:08, expires: 00:00:07
Explanation:
A common source of confusion for CCIE candidates is which multicast commands allow deny statements in their associated access lists and which do not. The "ip pim send-rp-announce" command does not work properly with deny statements. It is highly recommended that you take the above lab, and attempt to replace access-list 11 on R1 with the version of access-list 11 that is on R2 and observe the outcome.
A second source of confusion is making Auto-RP work with PIM Sparse-Mode. Since Auto-RP requires the multicast groups 224.0.1.39 and 224.0.1.40 to be flooded via PIM dense mode, Sparse-Mode breaks Auto-RP by default. The two most common solutions are to use PIM Sparse-Dense-Mode, or use the "ip pim autorp listener" command to force the router to use PIM Dense-Mode for the two Auto-RP groups.
Finally, this question tests your ability to minimize access list entries. Below is a table that helps visualize how to determine the least number of lines required in a permit-only access list. The area surrounded by a thick bold line includes the binary digits that differ between each of the subnets in question. The goal is to highlight what binary digits can be any value, and still encompass all of the subnets we require while not including any subnets we do not.
Binary Multicast Access-list Minimization (Click for larger image):
DocCD items to reference:
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