Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
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Chapter 10 Cisco IGX 8400 Series IP Service
Managing IP Services
If a controller is attached to an interface, master-slave connections are set up between the controller port
and each of the slaves in the node.
These LCNs will be allocated from the AutoRoute Management pool. This pool is used by AutoRoute
Management to allocate LCNs for connections.
VSI controllers require a bandwidth of at least 150 cps to be reserved on the port for signaling. This
bandwidth is allocated from the free bandwidth available on the port (free bandwidth = port speed - PVC
maximum bandwidth - VSI bandwidth).
Setting Up VSI Redundancy
The hot slave standby preprograms the slave standby card the same as the active card, so that when the
active card fails, the slave card switches over operation is implemented within 250 ms. Without the VSI
portion, the UXM card already provided the hot standby mechanism by duplicating internal IGX
protocol messages from the NPM to the standby UXM card.
Because the master VSI controller does not recognize the standby slave card, the active slave card
forwards VSI messages that it received from the master VSI controller to the standby slave VSI card.
In summary, these are the hot standby operations between active and standby card:
1. Internal IGX protocol messages are duplicated to a hot-standby slave VSI card by the NPM.
2. VSI messages (from master VSI controller or other slave VSI card) are forwarded to the hot-standby
slave VSI card by the active slave VSI card. Operation 2 is normal data transferring, which occurs
after both cards are synchronized.
3. When the hot-standby slave VSI card starts up, it retrieves and processes all VSI messages from the
active slave VSI card. Operation 3 is initial data transferring, which occurs when the standby card
first starts up.
The data transfer from the active card to the standby card should not affect the performance of the active
card. Therefore, the standby card takes most actions and simplifies the operations in the active card. The
standby card drives the data transferring and performs the synchronization. The active card forwards VSI
messages and responds to the standby card requests.
Qbin Statistics
Qbin statistics allow network engineers to engineer and overbook the network on a per CoS (or per Qbin)
basis. Each connection has a specific CoS and hence, a corresponding Qbin associated with it.
The IGX switch software collects statistics for UXM AutoRoute Qbins 1 through 9 on trunks and
Autoroute Qbins 2, 3, 7, 8, and 9 on ports. Statistics are also collected for VSI Qbins 10 through 15 on
UXM trunks and ports.
The following statistics types are collected per Qbin:
• Cells served
• Cells received
• Cells discarded
Since all Qbins provide the same statistical data, the Qbin number together with its statistic forms a
unique statistic type. These unique statistic types are displayed in Cisco WAN Manager and may also be
viewed by using the CLI.