Task 6 Multicast question

Hi ,

 well as per questions mentioned in the Multicast section . i configured multicasting and the test results are positive.


Reply to request 0 from 160.1.6.6, 8 ms
Rack1R7#

I tried 1 more thing

i configured a  ip igmp join group  228.8.8.8 on  fa0/1 interface of R7 which is a layer 3 switch. now when i tried to ping back from R6 and R3 to group 228.8.8.8 which is located on R7. it didnt go through. R7 is still able to ping 227.7.7. which is configured join on R6.

now when i run the debug on R3 debug ip mpacket this is what i see. When i ping from R3  ping vrf 100 228.8.8.8  the first packet gets the reply . as you can see in the below output. but after that all packets get dropped. Could you please let me  know why this happens.. and in the debug i can see not rpf interface.

has anyone seen this or noticed this. any fix to this problem ??

 

IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=146, ttl=255,
prot=47, len=124(124), mforward
IP(1): s=150.1.23.3 (Ethernet0/0) d=228.8.8.8 id=0, ttl=254, prot=1, len=114(100
), RPF lookup failed for source
IP(1): s=150.1.23.3 (Ethernet0/0) d=228.8.8.8 id=0, ttl=254, prot=1, len=114(100
), not RPF interface
IP(1): s=172.30.101.3 (Ethernet0/1.1000) d=228.8.8.8 (Tunnel0) id=0, ttl=254, pr
ot=1, len=100(100), mforward
IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=147, ttl=255,
prot=47, len=124(124), mforward
IP(1): s=150.1.3.3 (Loopback0) d=228.8.8.8 id=0, ttl=254, prot=1, len=100(100),
RPF lookup failed for source
IP(1): s=150.1.3.3 (Loopback0) d=228.8.8.8 id=0, ttl=254, prot=1, len=100(100),
not RPF interface
IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=148, ttl=255,
prot=47, len=72(72), mforward
IP(1): s=150.1.3.3 (Tunnel0) d=228.8.8.8 id=0, ttl=254, prot=1, len=100(100), no
t RPF interface
Reply to request 0 from 10.1.17.7, 44 ms
Rack1R3#ping vrf 100 228.8.8.8

Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 228.8.8.8, timeout is 2 seconds:

IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=149, ttl=255,
prot=47, len=78(78), mforward
IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=150, ttl=255,
prot=47, len=124(124), mforward
IP(1): s=150.1.3.3 (Loopback0) d=228.8.8.8 id=1, ttl=254, prot=1, len=100(100),
not RPF interface.
Rack1R3#
IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=151, ttl=255,
prot=47, len=68(68), mforward
Rack1R3#
IP(0): s=150.1.3.3 (Loopback0) d=239.100.100.100 (Ethernet0/0) id=152, ttl=255,
prot=47, len=68(68), mforward
Rack1R3#unde
Rack1R3#undebug all

 

 

 

regards

jimmy

Comments

  • Hi jimmy,

    your post is some time back, but I will give it a try:

    Did you remember to add the ip igmp join-group or (to avoid several ping replies) ip igmp static-group on the subinterfaces of R3 and R5 as well? Remember there is no PIM neighborship between these routers, so if they are not DenseMode and have these joins, it will NOT work.

    :-)

    BR

    Toby

  • ... oh and the first packet gets there since it travels Unicast... I think.

    Toby

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