I have a L3 network topology where the core network segment doesn't support IP Multicast protocols.
As such, I have configured a couple of X460 switches/routers in order to provide an end-to-end GRE tunnel able to encapsulate Multicast traffic without the need for IGMP/PIM (no control on the core network routers).
I expected to force Multicast traffic to be routed through the GRE tunnel interface by configuring a route in a similar way I'm used to do with Linux, e.g.:
add route -net 188.8.131.52 netmask 184.108.40.206 dev my_tunnel_gre
Unfortunately, I haven't found a command in the manual to configure such a route on ExtremeOS.
Does anyone have any idea how to achieve such a behavior?
I appreciate any answers able to solve the above issue.
I don't think the current EXOS implementation supports mulitcast forwarding over GRE tunnel.
• IPv4 only (both the routed traffic, and tunnel protocol)
• Unicast forwarding only, no Multicast
• Single IP address can be configured on a GRE tunnel
• Duplicate Address Detection (DAD) not supported
• No routing protocol support (RIP, OSPF, etc. etc.), only static routes
• Software based forwarding
If I correctly understood the behavior of the Multicast route, supposing of having the subnet 220.127.116.11/24 configured to belong to an OSPF Area 0.0.0.0, I would be able of forwarding OSPF Hello messages addressing the IP Multicast address "18.104.22.168" on the other side of the tunnel.
Strangely, this doesn't seem to happen as the OSPF router at either side of the tunnel does not see any neighbor.