Cisco Catalyst 3750-X User Manual

11-33
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 11 Configuring IEEE 802.1x Port-Based Authentication
Understanding IEEE 802.1x Port-Based Authentication
MACsec, MKA and 802.1x Host Modes
You can use MACsec and the MKA Protocol with 802.1x single-host mode, multiple-host mode, or Multi
Domain Authentication (MDA) mode. Multiple authentication mode is not supported.
Note Although the software supports MDA mode, there are no IP phones that support MACsec and MKA.
Single-Host Mode
Figure 11-7 shows how a single EAP authenticated session is secured by MACsec by using MKA.
Figure 11-7 MACsec in Single-Host Mode with a Secured Data Session
The same switch port hosts an unsecured phone session using CDP bypass. Since CDP bypass mode
bypasses authentication to provide access based only on device type, the switch does not attempt to enter
into an MKA exchange with the phone. If a voice VLAN is configured, CDP packets bypass MAC sec.
For secure voice access, you should use MDA mode.
Multiple-Host Mode
In standard (not 802.1x REV) 802. multiple-host mode, a port is open or closed based on a single
authentication. If one user, the primary secured client services client host, is authenticated, the same
level of network access is provided to any host connected to the same port. If a secondary host is a
MACsec supplicant, it cannot be authenticated and traffic would no flow. A secondary host that is a
non-MACsec host can send traffic to the network without authentication because it is in multiple-host
mode. See Figure 11-8.
Figure 11-8 MACsec in Standard Multiple-Host Mode - Unsecured
253663
MACsec
AAA
Access-control system
Switch with
MACsec
configured
Unsecured
IP
Host
253664
AAA
Access-control system
Switch with
MACsec
configured
Primary host
Secondary host
Secondary host

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