1. Prepare the experimental environment
2. sw1 creates vlan and adds pc to vlan, sw2 also creates vlan and joins vlan and does link aggregation
3. The upper interface of sw1 is used for link aggregation and integrated interface; the lower interface of ar1 is used for link aggregation and single-arm routing; ar1, ar2 and ar3 are used for link aggregation and configured with interface addresses; ar1 and ar3 are configured with default routes, and ar2 is two A static route.
4. Configure address information and test connectivity
5. ar3 remotely manage sw2, create an ip address and set a password in vlan20, which means that the next hop address of the default route is its own gateway. ar3 remote connection sw2
