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JunosE 11.3.x Physical Layer Configuration Guide
Exchanging Tunnel-Server Modules
216
Bandwidth Limitations of Shared Tunnel-Server Ports
Bandwidth limitations for shared tunnel-server ports and tunnel-service interfaces depend
on bandwidth restrictions, if any, that are in effect for the module on which the shared
tunnel-server port resides.
For the ES2 10G ADV LMs shared tunnel-server ports, you can reserve a percentage of
the total bandwidth available for forwarding using the reserve-bandwidth command.
The reserve-bandwidth command is not supported for other line modules that support
tunnel-server configuration.
NOTE: When you direct the router to reserve a percentage of the total
bandwidth for forwarding, you may not always obtain the exact percentage
of bandwidth specified. Because of the overhead involved with identifying
and assigning incoming traffic to the appropriate resources, you may obtain
a value less than the configured value. For instance, if you reserve 50 percent
of the total bandwidth for forwarding, you will not obtain an actual bandwidth
of 5 Gbps for forwarding and 5 Gbps for tunnel processing.
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 25 on page 216 displays sample capacity, configuration, and utilization values for
exchanging tunnel-server modules with different capacities.
Table 25: Sample Capacity, Configuration, and Utilization Values for
Tunnel-Service Interfaces
Old Provisioned
Interfaces
Old
(max-interfaces
Capacity
command)
8000
5000
New Provisioned
Interfaces
Old
New
(max-interfaces
Utilization
Capacity
command)
5000
16,000
5000
Copyright © 2010, Juniper Networks, Inc.
New
Utilization
5000
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