Cisco Catalyst 3750-X User Manual

19-9
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 19 Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling
Understanding Layer 2 Protocol Tunneling
Figure 19-4 Layer 2 Protocol Tunneling
Figure 19-5 Layer 2 Network Topology without Proper Convergence
In an SP network, you can use Layer 2 protocol tunneling to enhance the creation of EtherChannels by
emulating a point-to-point network topology. When you enable protocol tunneling (PAgP or LACP) on
the SP switch, remote customer switches receive the PDUs and can negotiate the automatic creation of
EtherChannels.
Customer X Site 2
VLANs 1 to 100
Customer Y Site 2
VLANs 1 to 200
Customer Y Site 1
VLANs 1 to 200
Customer X Site 1
VLANs 1 to 100
VLAN 30
Trunk
ports
Switch A
Trunk
ports
VLAN 30
VLAN 40
Service
provider
101822
Trunk
Asymmetric link
VLAN 30
VLAN 40
Trunk
ports
Switch B
Switch C
Switch D
Trunk
ports
101821
Customer X
virtual network
VLANs 1 to 100

Cisco Catalyst 3750-X Specifications

General

Switching Capacity	160 Gbps
Stacking Bandwidth	64 Gbps
Max Stacking Units	9
Layer Support	Layer 2 and Layer 3
Form Factor	Rack-mountable
DRAM	256 MB
Flash Memory	64 MB
Model	Cisco Catalyst 3750-X Series
Ports	24 or 48 10/100/1000 Ethernet ports
Uplink Interfaces	4 SFP or 2 SFP+
Features	StackWise Plus, EnergyWise
Image	IP Base or IP Services
Operating Temperature	0 to 40°C
Operating Humidity	10 to 85% noncondensing