34 C1640M-B (3/06)
Complete the following steps to verify your configuration:
1. Use the show ip igmp groups command to verify that the receiver has sent its IGMP join membership request for group 239.1.1.20 to R104.
r104# show ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter
239.1.1.20 Ethernet0/0 00:00:04 00:02:55 10.2.2.3
2. Use the show ip mroute group-address command to display that when the source 10.1.1.1 starts multicasting packets for the group
239.1.1.20, R102 installs the (*,239.1.1.20) and (10.1.1.1, 239.1.1.20) entries in the R102 mroute table, as shown below.
r102# show ip mroute 239.1.1.20
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.1.1.20), 00:00:09/00:02:59, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Tunnel0, Forward/Sparse-Dense, 00:00:09/00:00:00
Ethernet0/0, Forward/Sparse-Dense, 00:00:09/00:00:00
(10.1.1.1, 239.1.1.20), 00:00:09/00:02:58, flags: T
Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0
Outgoing interface list:
Tunnel0, Forward/Sparse-Dense, 00:00:09/00:00:00
NOTE: In the (10.1.1.1, 239.1.1.20) entry, the OIL is Tunnel0.
ip mroute 2.2.2.2 255.255.255.255 tunnel 0
!
!--- This Mroute is required for RPF check when sparse mode multicast traffic is
!--- flowing from RP (assuming R102 with 2.2.2.2 as RP) towards receiver via tunnel
!--- before the SPT switchover.
!
line con 0
line aux 0
line vty 0 4
login
!
end