Catalyst 3560 and 3750

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Catalyst 3750
Cisco Catalyst 3750 Stack
Manufacturer:	Cisco Systems
Design:	Fixed Configuration
Positioning:	Access, Aggregation
Throughput:	38.7 Mpps (max)
Switch Fabric:	32Gbps Ring
Max Ports:	9x48 (432) + 9x2 (18) 10GE

Catalyst 3560
Cisco Catalyst 3560
Manufacturer:	Cisco Systems
Design:	Fixed Configuration
Positioning:	Access Layer
Throughput:	38.7 Mpps (max)
Switch Fabric:	32Gbps Ring
Max Ports:	48 10/100/1000 + 2 10/100/1000

This article is about the the original 3750 and 3560 switches. For information on the 'E' series switches see 3560-E and 3750-E.

The Catalyst 3560 and 3750 are fixed-configuration desktop switches.

[edit] Common Architecture

The two switches share a common architecture, based on two alternating tokens allowing for efficient use of the internal 32gbps backplane.

Both series switches support up to 10/100/1000 access port speeds and up to 4xSFP uplinks. In addition, Layer 3 switching (routing) and PoE are available within this product set. With the exception of the limited Catalyst 500, the 3560 is Cisco's entry PoE switch.

[edit] Stackwise

The 3750 allows for Stackwise. This allows multiple switches to be stacked in a ring for redundancy and resilience. In this instance, one switch becomes the 'master' switch and all other switches 'slaves'. In this case, the master IOS is copied to each switch. The FIB is then generated on the master switch and copied to each of its slaved, for distributed forwarding.

As the port ASICs on the 3560 and 3750 are connected directly to the stack, an ingress frame will take the first available token and possibly have to traverse the entire stack (and all ports) before getting to its egress location. In the case of multicast, replication is done at each individual port.

Stackwise+ on the 3750-E improves many of the caveats with the original implementation, while remaining backwards compatible.