Cisco WS-C4003 Software Guide - Page 457
Configuring Switch Acceleration, Understanding Switch Acceleration
View all Cisco WS-C4003 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 457 highlights
32 C H A P T E R Configuring Switch Acceleration This chapter describes the Backplane Channel module and the switch acceleration feature supported on the Catalyst 4000 family supervisor engine. This chapter consists of these sections: • Understanding Switch Acceleration, page 32-1 • Configuring Switch Acceleration, page 32-3 • Backplane Channel Module, page 32-3 Note For complete syntax and usage information for the commands used in this chapter, refer to the Command Reference-Catalyst 4000 Family, Catalyst 2948G, and Catalyst 2980G Switches. Understanding Switch Acceleration The switch acceleration feature provides the following supervisor engine performance benefits: • Increased bandwidth between switch engines • Full-mesh connectivity between switch engines • Reduced internal traffic congestion The switch acceleration feature is supported on Catalyst 4006 switches with Supervisor Engine II and on the Catalyst 4000 family Backplane Channel module. The switch acceleration feature reduces internal traffic congestion by creating a full-mesh connection between the switch engines (SEs). The Supervisor Engine II has three switch engines that switch traffic to and from the modules and the uplink ports. This chapter refers to these switch engines as SE1, SE2, and SE3. • SE1 handles traffic for Gigabit Ethernet uplink port 1/1 and traffic between modules installed in the chassis. • SE3 handles traffic for Gigabit Ethernet uplink port 1/2 and traffic between modules installed in the chassis. • SE2 switches internal traffic and forwards traffic bound for the uplink ports to the correct SE for that port. By default, there is no direct internal connection between SE1 and SE3. As a result, traffic coming in on SE1 destined for SE3 or vice versa must go through SE2, which could potentially create congestion. To avoid such congestion, you can disable the uplink ports and create a direct internal link between SE1 and SE3. 78-12647-02 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 32-1