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Multicast problem with dynamically created vlans


Userlevel 3
Hi,
following scenario:
- two AccessSwitchstacks X450-G2 (22.4), each connected with an MLAG to a pair of Summit X620 Distributionswitches. (X450 <=> X620 <=> X450)
- VLAN A is configured in all Switches
- VLAN B is configured in X620 and dynamically created (via Netlogin) in X450 (f.e. SYS_VLAN_123)

In VLAN B Multicast-using devices (Bonjour in this case) can not see each other if they are not on the same access switch.

Using "show mcast cache" I see the Uplink Port towards the distribution switch (port 1:49) is only shown in configured VLANs and not in dynamically created VLANs.
f.e. configured VLAN A :
snoop 224.0.0.18 172.16.128.3 43 A
Vlan Port Vid
A 1:22 1460
1:23 1460
2:34 1460
2:38 1460
1:49 1460[/code]dynamically crated VLAN B (1155):
snoop 224.0.0.1 141.45.139.151 81 SYS_VLAN_1155
Vlan Port Vid
SYS_VLAN_1155 1:23 1155
1:24 1155
2:3 1155
2:4 1155[/code]Everything is tagged on Uplink Ports. So I think we have a problem with Multicast packets over Uplinks in dynamically created VLANs. The Switches are running Multicast default configuration. Is there something I have to configure für dynamic VLANs?

2 replies

Userlevel 7
no idea but could it be this !?

https://documentation.extremenetworks.com/exos_commands_22.3/exos_21_1/exos_commands_all/r_configure...
Userlevel 3
Yes, this is the method we use to add dynamically created VLANs to our Uplink Portsshow config vlan
...
configure vlan dynamic-vlan uplink-ports add ports 1:49[/code]And those VLANs are affected with our multicast problems.

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