Multicast is not working between our two datacenter, we have catalyst 2960S (two stacked) as the internal lan switch, and catalyst 3560E as the external switch, same configuration for both datacenters.
The two sites are connected using metro, the external switch (3560) is doing qinq and encapsulate the data from the internal switch with the metro vlan (611).
IGMP snooping is disabled for all switches, although we prefer to enable it for the internal switches.
For each datacenter there is a different firewall which also act as the router, we are using fortigate as the firewall.
Following is the important configuration section:
Port 43 in the internal switch is connected to the external switch (both sites):
switchport mode trunk
Port 3 in the external switch connected to the internal switch (both sites):
switchport access vlan 611
switchport mode dot1q-tunnel
no cdp enable
no cdp tlv server-location
no cdp tlv app
Port 8 on the external switch connected to the metro link (both sites) vlan 350 is the internet and 611 is the metro:
I am wondering how the Two DataCenters are currently communicating without adding the (Native VLAN) Command on the internal Switch.
Your Internal Switch port 2960, port 43 connected to the external should have the following config on both sides:
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk NATIVE VLAN 611
This is the Outer VLAN representing/connecting both sites, and the External Switch should recieve this VLAN-ID untagged from your internal, and then the external Witch TAG it with 611 and tunnel your inner vlans to the other external Switch
do you have a VLAN interface at the other external switch side like (.1)? and can you ping it from (.2) vlan 611 interface
the 2960 switch doesn't support qinq, 611 is the vlan of the metro, in the internal switch we have other vlans, so the external switch recieving the packewts from the internal switch on port 3 add another tag 611, now the packet is tagged twich, once with the internal switch vlan and once with the 611.
when the information is coming from the metro it goes to port 3 tagged only with the internal vlans.
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