Chapter 1 Introducing the GLC1320G-55

Anti-IP Address Spoofing

With DHCP snooping, the GLC1320G-55 records which IP addresses are assigned on each port. The GLC1320G-55 drops packets from a device using a different IP address.

Anti-MAC Address Spoofing

The GLC1320G-55 checks to make sure the MAC addresses of the devices connected to the subscriber ports are not the same as MAC addresses of devices connected to the Ethernet network. This protects the network from disruptions of service caused by subscriber devices spoofing the MAC address of ISP servers.

PPPoE Intermediate Agent Information

Similar to DHCP relay option82, you can set the system to insert line information into client PPPoE Active Discovery Initialization (PADI), PPPoE Active Discovery Request (PADR), and upstream PPPoE Active Discovery Terminate (PADT) packets. This allows a PPPoE termination server to identify and authenticate a PPPoE client.

Transparent LAN Service (TLS)

Use TLS (also known as VLAN stacking) to add an outer VLAN tag to the inner IEEE 802.1Q tagged frames that enter the network. By tagging the tagged frames (“double-tagged” frames), the service provider can manage up to 4,094 VLAN groups with each group containing up to 4,094 customer VLANs. This allows a service provider to provide different services based on specific VLANs, for many different customers.

Classifier and Policy

You can create an ACL profile and map it to individual ports to define actions to be performed on traffic that matches the ACL profile. The ACL profile specifies criteria such as the IP address, port number, or protocol type, and so on.

Console Port

Use the console port for debugging and troubleshooting.

1.3 Front Panel

The figure below shows the front panel of the GLC1320G-55.

Figure 2 Front Panel

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GLC1320G-55 User’s Guide