Cisco WS-X6708-10G-3CXL= - 10 Gigabit Ethernet Module Manual de usuario descargar pdf (Pagina 35)

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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 key 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 does fail then 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.

During the local chassis reload the line cards will also reload. For devices connected to the Virtual Switching System

in a dual-homed manner using a multi-chassis Etherchannel connection or using Layer 3 Equal Cost Multipath links,

only the interfaces attached to the chassis performing the reload will be affected. Based on the peer devices ability to

detect the loss of link on the interfaces associated with reloading chassis, traffic will switched to the remaining active

chassis in the Virtual Switching System. Typically for Multi-chassis Etherchannel or Layer 3 Equal Cost links this is a

hardware based subsecond convergence event.

In-chassis Standby Boot Process

The boot process for the second supervisor installed in VSS chassis is different compared to the boot process for a

second supervisor in a standalone chassis. Early in the boot process the supervisor will perform a role negotiation

with the existing supervisor in the chassis. Once the supervisor determines that it will become the standby supervisor

for the chassis it will then detect if the system is configured for the VSS. If the VSS configuration is detected the

supervisor will then extract and boot a new software image dedicated to an In-chassis standby supervisor in a VSS.

The new software image will proceed to boot and reach the RPR-WARM redundancy mode.

As shown in Figure 22, the second supervisor proceeds to boot to the RPR-WARM redundancy mode by loading a

different Cisco IOS Software image. The new software image is specifically developed for a supervisor module

operating as the VSS in-chassis standby role. The new image is called the “Sup-LC” image, as in Supervisor-Line

Card. The Sup-LC image file is extracted out of the image already running on the supervisor in much the same way

as a line card extracts its image file from the Cisco IOS Software image running on the active supervisor. Therefore

there are no additional requirements to copy a separate image to the file system of the switch.

Once the supervisor successfully loads the Sup-LC image the supervisor will primarily operate as DFC-enabled line

card, In addition the supervisor will perform synchronization of key supervisor subsystems so that if needed the

supervisor may reload and assume the role of the in-chassis active supervisor.

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