ā06-09-2025 07:16 AM
Hi Team,
I want to configure multicast between two fabric linked by legacy trunk of VLANs, they are two different fabrics not a multiarea fabric.
It“s multicast at L2, igmp snooping , the senders and receivers will be in both fabric distributed aleatory.
Is this topology supported? Any tips to configure it?
For ip igmp snooping inside a single fabric I configure:
At global level:
router isis
spbm 1 multicast enable
At VLAN level:
interface vlan XX
ip igmp proxy
ip igmp snooping
But I dont know how to inyect multicast traffic between them.
Regards
EF
Solved! Go to Solution.
ā06-10-2025 01:16 PM
Hi EF,
A quick and simple way is to statically forward all MCAST's from Fabric 1 to Fabric 2 and from Fabric 2 to Fabric 1, to that you configure static-group membership in the vlan interface towards port(s).
You can specify group address per group address to be forwarded or group address ranges to one or more ports.
Disadvantage is that existing streams are always forwarded over the link.
interface Vlan 1000
ip igmp static-group 239.0.0.1 239.0.0.1 1/9,1/11 static
ip igmp static-group 239.0.0.5 239.0.0.8 1/11 static
exit
regards
WillyHe
ā06-25-2025 01:16 AM
Thanks WillyHe,
but one question, and sorry in advance for my lack of knowledge. I understand PIM is used for multicast in L3 topologies and in this solution all members (senders and recivers) are in the same VLAN, or SPBM-PIM Gateway can acts in L2 topology?
Regards
ā06-25-2025 08:50 AM
What you need to dynamically connect MCAST between two SPBM domains https://extreme-networks.my.site.com/ExtrArticleDetail?an=000096922
regards
WillyHe
ā06-25-2025 01:30 AM
ā06-24-2025 11:53 PM
Hi,
yes it works with statics groups, I was using the command incorrectly, GTAC give the solution, for example for 5 groups:
int vlan 200
ip igmp static-group 234.5.6.10 234.5.6.10 1/27 static
ip igmp static-group 234.5.6.11 234.5.6.11 1/27 static
ip igmp static-group 234.5.6.12 234.5.6.12 1/27 static
ip igmp static-group 234.5.6.13 234.5.6.13 1/27 static
ip igmp static-group 234.5.6.14 234.5.6.14 1/27 static
exit
Regards
EF