How to interconnect a CE series switch with a Cisco switch through GRE

A CE series switch can interconnect with a Cisco switch through GRE, and they support the Keepalive function of GRE tunnels. The following is a configuration example (basic configurations such as the routing configuration are not provided):

Tunnel interface configuration on a Cisco switch:
interface Loopback0
ip address 1.1.1.191 255.255.255.255
interface Tunnel1
ip address 30.1.1.2 255.255.255.0
keepalive 10 3
tunnel source Loopback0
tunnel destination 152.2.252.11

Tunnel interface configuration on a CE series switch:
interface Tunnel1
ip address 30.1.1.1 255.255.255.0
tunnel-protocol gre //GRE encapsulation is used on the tunnel interface of a Cisco switch by default.
keepalive period 10 //The minimum Keepalive period on a Cisco switch is 10s.
source 152.2.252.11
destination 1.1.1.191

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