Redundancy And Hot-Swap - Vocality V200 User Manual

Vocality User Manual
User Manual for V200
Valid for V08_08.02 or V08_48.02
Hunt Group Menu

Directory Menu

Auto Mapping Menu

Feature Keys

Slot Management

NOTE: All pages that have the 'Menu Name#x' at the top indicate the information
shown on those pages is stored in configuration store number "x". The parameters
displayed on pages that do not have this format of banner are stored in the system
configuration. For example, the top banner 'Clocking #1' indicates the Clocking menu
and that the current edit configuration store is number 1. The banner 'Directory'
indicates the Directory menu, the parameters for which are stored in the system
configuration.
2.2.5

Redundancy and Hot-swap

The V200 chassis and service cards are designed to provide years of reliable operation
for mission-critical networks. To augment the basic robustness, all cards, including even
the PSU, may be operated in pairs to provide a hot-standby for essential services. This is
implemented using the concept of a Primary and a Secondary card, both of which are
powered up and operative in the chassis but only one of which, the primary, carries
traffic. Both cards are configured identically such that in the event that the Primary card
fails, traffic may be externally re-routed into the Secondary card and full service
resumes. (NOTE: data will be lost during the brief switchover).
Part of the recovery strategy is also to be able to replace the faulty card without
disrupting the flow of traffic through the active Secondary. This is achieved through the
ability to safely remove any card in the chassis with power applied, without fear of
damage to either the card or the chassis. A replacement card may then be plugged in
and will be smoothly powered up under the full control of the active CPU card without
affecting any traffic passing through the rest of the chassis.
It may be desirable to shut a card down for maintenance purposes without loss of data.
This can be achieved through the use of the Alert button fitted to all cards. When this
button is pressed, a flashing sequence (RED, GREEN, OFF, ...) commences on the card
status LED which speeds up over a period of five seconds until it becomes orange and
then finally extinguishes if the shutdown is successful. If the button is released before
the 5 seconds expires or is knocked accidentally, the LED goes back to its original port
status use and the shutdown attempt is abandoned. If the shutdown attempt is
successful and a standby card is present in the chassis for that slot, traffic will be re-
routed to it. It may also be desirable to later re-route traffic back to a replaced card
without loss of data.
It is also possible to place a card into shutdown mode from the menus. This again
allows the traffic-carrying card to be selected as long as a standby is available.
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