Cisco Cisco 1700 2600 3600 3700 Series VPN Module White Paper
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Example for Sup2T:
vss#show platform hardware pfc mode
PFC operating mode : PFC4
Configured PFC operating mode : None
Additionally, as an optional configuration, the supervisor engines of both chassis may prenegotiate their modes to
be in XL-mode or non-XL-mode. This is useful if one wants to help ensure that a VSS running in PFC3C-XL or
PFC4-XL mode will not negotiate to a non-XL mode in the event a non-XL line card is inserted into the system.
Example for configuring PFC4 non-XL mode on Sup2T
vss#platform hardware vsl pfc mode non-XL
In VSS mode, system EARL mode will be forced to non-XL on next bootup
Virtual Switch Link-Capable Interfaces
VSL-capable interfaces are required to create a VSL port channel. These interfaces contain port ASICs that allow
the Virtual Switch Header (VSH) to be encapsulated on each frame forwarded out of the port and also support the
ability to deencapsulate VSH-tagged frames. The only 10 gigabit Ethernet module which is not supported as a VSL
port is the WS-X6704-10GE module.
2
Table 2.
VSL-Capable Interfaces
Module
Description
# VSL Ports 10 GE (Capable)
VS-S2T-10G/XL
Supervisor Engine 2T
2
WS-X6904-40-2T/2TXL
40 GE Linecard/10 GE Linecard
4 (40 Gigabit Ethernet)
8 (10 Gigabit Ethernet)
8 (10 Gigabit Ethernet)
WS-X6908-10G-2T/2TXL
10 GE Linecard
8
WS-X6816-10G-2T
16-Port 10 GE X2 Fiber Linecard with
DFC4/DFC4XL
DFC4/DFC4XL
4 (Performance mode)
*
WS-X6816-10T-2T/2TXL
16-Port 10 GE Copper Linecard with
DFC4/DFC4/XL
DFC4/DFC4/XL
4 (Performance mode)
*
VS-S720-10G-3C/XL
Supervisor Engine 720-10GE
2
WS-X6708-10G-3C/XL
10 GE Linecard
8
WS-X6716-10G-3C/XL
16-Port 10GE X2 Fiber Linecard with
DFC3C/DFC3CXL
DFC3C/DFC3CXL
4 (Performance mode)
*
WS-X6716-10T-3C/XL
16-Port 10GE Copper Linecard with
DFC3C/DFC3C/XL
DFC3C/DFC3C/XL
4 (Performance mode)
*
*
The WS-X6716-10G-3C/XL can operate in two modes - Oversubscription and Performance (only 1 port from each port-group
can be used).
Supported Chassis
From a chassis perspective, the supported chassis types follow the support of the supervisor engine. Therefore, for
a Supervisor Engine 720-10 G-based system, both non-E-series chassis, as well as E-series chassis, are
supported. However, with a Supervisor Engine 2T-based system, only E-series chassis are supported.
3
There is no requirement to match the types of chassis used in the VSS. The chassis consisting of the Cisco Virtual
Switching System can be different chassis with varying slot counts.
2
The WS-X6704-10GE module is supported in the VSS as a line card but cannot be used as part of the VSL.
3
hardware devices.