From: CCIE To Be (ccie.tobe81@gmail.com)
Date: Sun Jan 11 2009 - 18:41:54 ARST
Dear Group,
Following is the topology,
R1,R2 & R3 are connected over frame relay network whereas R1 is the hub.
Multicasting is also running over this FR network in which R1 is acting as
RP & Mapping Agent. All interfaces in multicast domain are in 'sparse mode'
and following groups have been assigned to R3's ethernet for multicast
testing 224.1.1.1 & 224.2.2.2. My question is that I am not using
'sparse-dense-mode' nor 'autorp listener' but multicast is working fine
without using any of these options. How autorp messages are propagating
across the multicast domain in this scenario ??
Following are few outputs,
R2#ping 224.1.1.1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
Reply to request 0 from 192.168.1.3, 276 ms
Reply to request 0 from 192.168.1.3, 280 ms
R2#show ip pim rp
Group: 224.1.1.1, RP: 1.1.1.1, v2, uptime 00:33:37, expires 00:02:04
R2#show ip pim rp mapping
PIM Group-to-RP Mappings
Group(s) 224.1.1.1/32
RP 1.1.1.1 (?), v2v1
Info source: 1.1.1.1 (?), elected via Auto-RP
Uptime: 00:36:19, expires: 00:02:22
Group(s) 224.2.2.2/32
RP 1.1.1.1 (?), v2v1
Info source: 1.1.1.1 (?), elected via Auto-RP
Uptime: 00:36:18, expires: 00:02:21
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