igmp join-group on 3550

From: Maxim Kurushkin (m.kurushkin@orange-ftgroup.ru)
Date: Fri Jan 19 2007 - 10:55:35 ART


Good day, Group.
I have strange behavour of 3550.
My topology is very clear:

Router <-> 3550

On Router:
interface FastEthernet0/1
 ip address 152.1.3.3 255.255.255.0

On Switch:
interface FastEthernet0/3
 no switchport
 ip address 152.1.3.8 255.255.255.0
 ip igmp join-group 225.3.3.3

BUT:
Router#ping 225.3.3.3
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 225.3.3.3, timeout is 2 seconds:
.
Router#

Ping work only if I switch on pim on switch:

interface FastEthernet0/3
 no switchport
 ip address 152.1.3.8 255.255.255.0
 ip pim dense-mode
 ip igmp join-group 225.3.3.3

Then:
Router#ping 225.3.3.3
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 225.3.3.3, timeout is 2 seconds:
Reply to request 0 from 152.1.3.8, 4 ms
Router#

Why Switch dont work like host (multicast receiver)? Why it work only
with PIM enabled on interface?

WBR,
Maxim



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