Multicast on VLANs

[regatalcatel]

Hi All,

I have a challenge with Couple of 6850s where the multicast doesnt traverse the second switch.

I have a multicast feed connected to a port on the 1st switch. this port is on vlan 25. And the device that feeds the multicast tags the packets to vlan25. This device also does DHCP for this vlan.

#####on switch one#########
vlan 25 enable name "multicast"
vlan 30 enable name "School"
vlan 40 enable name "admin"
vlan 40 ip 192.168.40.200 255.255.255.0

#######This is on the Trunk#######
vlan 25 802.1q 1/13
vlan 30 802.1q 1/13
vlan 40 port default 1/13

########this is on the port that the multicast feed is connected to##########
vlan 25 802.1q 1/20
vlan 30 802.1q 1/20
vlan 40 port default 1/20

ip multicast querying enable
ip multicast source-timeout 65535
ip multicast status enable
ip multicast vlan 25 last-member-query-interval 10
ip multicast vlan 25 proxying disable
ip multicast vlan 25 querier-forwarding disable
ip multicast vlan 25 querying enable
ip multicast vlan 25 query-interval 125
ip multicast vlan 25 query-response-interval 100
ip multicast vlan 25 robustness 2
ip multicast vlan 25 router-timeout 90
ip multicast vlan 25 source-timeout 65535
ip multicast vlan 25 spoofing disable
ip multicast vlan 25 status enable
ip multicast vlan 25 unsolicited-report-interval 10
ip multicast vlan 25 version 2
ip multicast vlan 25 zapping disable


And I have 2nd switch conencted to a port on the 1st switch.
The ports that are used to link the switches are set vlan 25 and a few other vlans that it needs to trunk.

I have users on a few ports on the 2nd switch. these ports are set to vlan 25 as default.

#####on switch two#########
vlan 25 enable name "multicast"
vlan 30 enable name "School"
vlan 40 enable name "admin"
vlan 40 ip 192.168.40.201 255.255.255.0

#######This is on the Trunk#######
vlan 25 802.1q 1/24
vlan 30 802.1q 1/24
vlan 40 port default 1/24

########this is on the port that a user is connected to ##########

vlan 30 802.1q 1/1
vlan 25 port default 1/1

The challenge is the the users on the 2nd switch get an IP from the multicaster, but they dont join the multicast on the same vlan.....
However if I move the user over to switch1, then the users can join the multicast group.


please help

[silvio]

If you haven't any MC-routing (like pim or dvmrp) you have to set the ports staticly at all switches for all ports (ip multicast static-querier, ip multicast static-neighbor). The better way is to switch on a mc-routing-protocoll to dynamically learn about the mrouter port (neighbor):
ip load dvmrp
ip dvmrp interface vlan-25
ip dvmrp status enable

regards Silvio