Cisco 6500 - Manual (Page 10)

4-10
Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Understanding Virtual Switching Systems
Note • When using the 10-Gigabit Ethernet ports on the WS-X6716-10G or WS-X6716-10T switching
module as VSL links, you must operate the ports in performance, not oversubscription, mode. If you
enter the no hw-module switch x slot y oversubscription command to configure
non-oversubscription mode (performance mode), then only ports 1, 5, 9, and 13 are configurable;
the other ports on the module are disabled.
• Port-groups are independent of each other and one, or more, port-groups can operate in
non-oversubscribed (1:1) mode (e.g. for VSL) with the 3 unused ports administratively shutdown,
while the others can still operate in oversubscribed (4:1) mode.
PFC, DFC, and CFC Requirements
The VSS supports any 67xx series switching module with CFC hardware.
The VSS supports DFC3C or DFC3CXL hardware and does not support DFC3A/3B/3BXL hardware.
If any switching module in the VSS is provisioned with DFC3C, the whole VSS must operate in PFC3C
mode. If a 67xx series switching module with a DFC3A/3B/3BXL is inserted in the chassis of a VSS,
the module will remain unpowered, because VSS supports only DFC3C and DFC3CXL.
If the supervisor engines are provisioned with PFC3C, the VSS will automatically operate in 3C mode,
even if some of the modules are 3CXL. However, if the supervisor engines are provisioned with
PFC3CXL, but some of the modules are 3C, you need to configure the VSS to operate in 3C mode. The
platform hardware vsl pfc mode pfc3c configuration command sets the system to operate in 3C mode
after the next restart. See the
“SSO Dependencies” section on page 4-25 for further details about this
command.
Multichassis EtherChannel Requirements
Physical links from any 67xx series switching module can be used to implement a Multichassis
EtherChannel (MEC).
Service Module Support
VSS mode supports these service modules:
• Network Analysis Modules (NAM):
– WS-SVC-NAM-1
– WS-SVC-NAM-2
• Application Control Engines (ACE):
– ACE10-6500-K9
– ACE20-MOD-K9
• Intrusion Detection System Services Module (IDSM): WS-SVC-IDSM2-K9
• Wireless Services Module (WiSM): WS-SVC-WISM-1-K9
• Firewall Services Module (FWSM): WS-SVC-FWM-1-K9
Note Before deploying a service module in VSS mode, check the service module release notes and if
necessary, upgrade the service module software.