Currently, EXOS does not support multicast forwarding over GRE tunnel.
Below are the limitation of GRE tunnel in EXOS.
- IPv4 only (both the routed traffic and tunnel protocol)
- Unicast forwarding only, no multicast forwarding supported
- Single IP address can be configured on a GRE tunnel
- No duplicate Address Detection (DAD) supported
- No routing protocol support (RIP, OSPF, etc. etc.), only static routes supported
- Software based forwarding