Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Uživatelský manuál stáhnout pdf (Strana 34)

White Paper

Intrachassis Availability

The initial release of the Cisco Virtual Switching System supports only a single supervisor per chassis. If a second, or

redundant, supervisor is installed in an individual chassis then the redundant supervisor will not fully boot. The

redundant supervisor will stop the boot process at the ROMMON stage. In this configuration any device connected to

the chassis in a single-homed, or single-attach, manner must rely on the availability of the single supervisor.

Therefore the recommendation for connecting to the VSS is to always dual-attach devices.

As a result of the single supervisor per chassis support the recovery period for replacing a failed supervisor module is

undeterministic in that the recover process requires manual intervention in order to install and initialize a new

supervisor in the chassis.

Beginning in the 12.2(33)SXI4 software release, Quad-Sup Uplink Forwarding is supported which allows for a

redundant supervisor to fully boot Cisco IOS Software, thereby providing a deterministic recovery option for

redundant supervisors in a VSS chassis.

Quad-Sup Uplink Forwarding

Quad-Sup Uplink Forwarding is a supervisor redundancy feature developed just for the Virtual Switching System. The

Quad-Sup Uplink Forwarding feature allows the In-chassis standby supervisor to fully boot Cisco IOS Software and

provide full functionality of its uplink ports. In addition, the supervisor will perform some basic synchronization with the

Active supervisor in the local chassis. From the local chassis perspective whichever supervisor boots first will become

the “In-chassis Active” supervisor while the second supervisor will be become the “In -chassis Standby” supervisor.

See Figure 21.

Figure 21. Virtual Switching System with Quad-Sup Uplink Forw arding

With the In-chassis Standby supervisor fully booted the uplink ports are fully operational. The uplink ports can be

used as part of the VSL port-channel interfaces or other connectivity just like ports on any other line card.

RPR-WARM Redundancy Mode

The In-chassis Standby supervisor runs a new redundancy mode called “RPR- Warm,” stated “RPR minus Warm.”

The RPR- Warm redundancy mode is only available in the Virtual Switching System.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 61 62

Žádné komentáře

Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Uživatelský manuál Strana 34