Classical network model

The aggregation layer is simplified, which is sufficient for most companies with less than 500 access numbers. The gateway is directly placed on the core switch. 1) access

In some places, idiot switches are used. Access is mainly configured to isolate broadcast domains. Different vlans are separated and can be isolated by department and number of access.

To prevent loops, spanning tree protocols (STP, RSTP, and MSTP) are configured at the access layer.

2) core

Configure the GATEWAY of the SVI interface and the connection between the SVI interface and the core. Configure VRRP for redundancy of the SVI gateway and prevent STP from being configured with the access loop.

The main function of the core is high-speed forwarding, as the hub between convergence, exit and server;

Svi, VRRP, and STP must be configured because the core is sometimes connected to the access switch server.

Configure IP addresses for the sVI interface core, egress, and aggregation. The core uses OSPF to connect the aggregation and egress routes.

3) export

Ospf runs on the egress and the core. Acls, NAT, and pppoe are used to connect the egress to the carrier.