Generating and distribution of the Distributed Cisco Express Forwarding (dCEF) database to the
different stack members
•
The MAC address of the master is used as source MAC of routed packets• Packets that need process switching are handled by CPU of the master•
The stack members perform the following tasks:
They act as routing standby switches which can take over when the stack master fails• Programming of the routes in the dCEF database in hardware•
When the master fails, the stack members will (apart from a momentarily interruption) continue to forward the
packets in hardware while no protocols are active.
After a new master has been selected following a master failure, the newly elected master will start sending
gratuitous ARPs with its own MAC address in order to update the devices in the network with the new MAC
address that will be used to rewrite the routed packets.
For more information regarding 3750 switch stack behavior and configuration, refer to the Managing Switch
Stacks documentation.

Related Products

This configuration can also be used with the following hardware and software versions.
Any Catalyst 3750 switch running EMI software or SMI version 12.1(14)EA1 and later.• Any Catalyst 2900XL/3500XL/2950/3550 or Catalyst OS switches for access layer switch.•
Configure
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup
Tool ( registered customers only) .

Network Diagram

This document uses the network setup shown in the diagram below.
Cisco − Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration