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Exchanging Tunnel-Server Modules

Tunnel-server modules are available in different hardware revisions that support varying numbers of tunnel-service interfaces. For more information about determining the hardware revision on a module, see ERX Module Guide, Table 1, Module Combinations, or E120 and E320 Module Guide, Table 1, Modules and IOAs.

When you exchange a tunnel-server module with a lower capacity for tunnel-service interfaces with a module that supports a higher capacity, the tunnel-server port maintains the original number of provisioned tunnel-service interfaces. By using the all-available keyword with the max-interfaces command, you can configure the tunnel-server port to automatically adjust the number of provisioned tunnel-service interfaces to the maximum value supported by the new module.

When you exchange a tunnel-server module that has a higher number of provisioned interfaces than the new module’s capacity, the module adjusts the provisioned number of interfaces to the maximum value that the module supports.

Table 23 displays sample capacity, configuration, and utilization values for exchanging tunnel-server modules with different capacities.

Table 23: Sample Capacity, Configuration, and Utilization Values for Tunnel-Service Interfaces

Old Capacity	Old Provisioned Interfaces (max-interfaces command)	Old Utilization	New Capacity	New Provisioned Interfaces (max-interfaces command)	New Utilization
8000	5000	5000	16,000	5000	5000
8000	8000	8000	16,000	8000	8000
8000	all-available	8000	16,000	all-available	16,000
16,000	5000	5000	8000	5000	5000
16,000	16,000	16,000	8000	8000	8000
16,000	all-available	16,000	8000	all-available	8000

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