Alcatel-Lucent 6850 Bpdu Shutdown Ports, Command Line Interface CLI, Dhcp Relay, Dhcp Snooping

Software Supported

BPDU Shutdown Ports

It is possible to configure a global UserPorts profile, as described in “ACL & Layer 3 Security”, to moni- tor BPDU on user ports. Such a profile also determines whether user ports will filter BPDU or will admin- istratively shutdown when BPDU are received on the port. Note that this functionality only applies to ports that are designated as members of the UserPorts port group.

A port configured to administratively shutdown when BPDU are detected will generate an inferior BPDU every 5 seconds. This will prevent loops in the network if two BPDU shutdown ports are accidentally bridged together either through an external loop or through a hub, since both ports would be receiving inferior BPDUs.

Command Line Interface (CLI)

Alcatel-Lucent’s command line interface (CLI) is a text-based configuration interface that allows you to configure switch applications and to view switch statistics. Each CLI command applicable to the switch is defined in the CLI Reference guide. All command descriptions listed in the Reference Guide include command syntax definitions, defaults, usage guidelines, example screen output, and release history.

The CLI uses single-line text commands that are similar to other industry standard switch interfaces.

DHCP Relay

DHCP Relay allows you to forward DHCP broadcast requests to configurable DHCP server IP address in a routing environment.

DHCP Relay is configured using the IP helper set of commands.

DHCP Option-82 (Relay Agent Information Option)

The DHCP Option-82 feature enables the relay agent to insert identifying information into client-origi- nated DHCP packets before the packets are forwarded to the DHCP server. The implementation of this feature is based on the functionality defined in RFC 3046.

When DHCP Option-82 is enabled, communications between a DHCP client and a DHCP server are authenticated by the relay agent. To accomplish this task, the agent adds Option-82 data to the end of the options field in DHCP packets sent from a client to a DHCP server.

If the relay agent receives a DHCP packet from a client that already contains Option-82 data, the packet is dropped by default. However, it is possible to configure a DHCP Option-82 policy that directs the relay agent to drop, keep, or replace the existing Option-82 data and then forward the packet to the server.

DHCP Option-82 is supported on the OmniSwitch 6800 Series and OmniSwitch 6850 Series. The 6.1.3.R01 release provides support for this feature on the OmniSwitch 9000 Series.

DHCP Snooping

DHCP Snooping improves network security by filtering DHCP packets received from devices outside the network and building and maintaining a binding table (database) to log DHCP client access information. There are two levels of operation available for the DHCP Snooping feature: switch level or VLAN level.

To identify DHCP traffic that originates from outside the network, DHCP Snooping categorizes ports as either trusted or untrusted. A port is trusted if it is connected to a device inside the network, such as a DHCP server. A port is untrusted if it is connected to a device outside the network, such as a customer switch or workstation. The port trust mode is also configurable through the CLI.

Additional DHCP Snooping functionality includes the following:

page 20 OmniSwitch 6800/6850/9000—Release 6.1.3.R01