Cisco Cisco 1700 2600 3600 3700 Series VPN Module White Paper

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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 14

Figure 14. Virtual Switching System with Quad-Sup Uplink Forwarding

With the In-chassis Standby supervisor fully booted, the uplink ports are fully operational. They can be used as part

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

Note: Quad-Sup Uplink Forwarding is supported on Supervisor720-10G-based systems. Quad-Sup Uplink
forwarding is not supported with Sup2T based systems. The Sup2T will support VSS-based supervisor redundancy

in a future software release.

RPR-WARM Redundancy Mode

The In-chassis Standby supervisor runs a new redu

ndancy mode called “RPR- Warm,” stated “RPR minus Warm”.

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

In addition to fully booting the in-chassis standby supervisor and providing fully operational uplink ports, the RPR-

Warm redundancy mode also provides synchronization of the necessary information to allow the In-chassis

Standby supervisor to reload and take over as the in-chassis active supervisor if needed. The RPR- Warm

redundancy mode synchronizes the following crucial variables and data structures:

●

Startup-config

●

Vlan.dat

●

BOOT ROMMON variable

●

CONFIG_FILE ROMMON variable

●

BOOTLDR ROMMON variable

●

DIAG ROMMON variable

●

SWITCH_NUMBER ROMMON variable

It is important to note that the RPR- Warm redundancy mode is not a stateful redundancy mode, as it applies to the

local chassis. In other words, if the in-chassis active supervisor fails, the In-chassis standby supervisor will detect

the failure and reload the local chassis. Subsequently, the former in-chassis standby supervisor will boot as the in-

chassis active supervisor.