Redundancy And Interface Distribution Of Tunnel-Service Interfaces; Sms, Es2-S1 Service Ioa, And Shared Tunnel-Server Modules; Static Ip Tunnel-Service Interfaces - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - PHYSICAL LAYER CONFIGURATION GUIDE 2010-09-24 Configuration Manual

Redundancy and Interface Distribution of Tunnel-Service Interfaces

SMs, ES2-S1 Service IOA, and Shared Tunnel-Server Modules

Copyright © 2010, Juniper Networks, Inc.
The redundancy and distribution mechanisms supported for tunnel-service ports
configured on ISMs differ from those supported for SMs, the ES2-S1 Service IOA, and
shared tunnel-server ports.
This section describes the redundancy and interface distribution mechanisms for all
tunnel-server ports.
You can install multiple modules to provide redundancy. If you install multiple modules
at the same time, the router automatically distributes the tunnel-service interfaces over
the modules in proportion to the available tunnel-service interfaces. Both the primary
and the redundant line modules must provide identical functionality. For instance, if the
primary line module provides forwarding functionality, you cannot configure the redundant
line module to provide shared tunnel-server functionality. Similarly, if the primary line
module provides shared tunnel-server functionality, you cannot configure the redundant
line module to provide forwarding functionality.
NOTE: Shared tunnel server on the ES2 10G ADV LM supports line module
redundancy.
Even distribution of tunnel-service interfaces is not critical to router performance. However,
the number of modules that you install must be able to support the extra tunnel if one
of the modules becomes unavailable.
NOTE: When both dedicated tunnel-server ports (on SMs) and shared
tunnel-server ports (on shared tunnel-server modules) are configured on
ERX7xx models, ERX14xx models, and the ERX310 router, the router performs
load balancing across all available server ports of the same type. For this
purpose, dedicated tunnel-server ports (on SMs) and shared tunnel-server
ports (on shared tunnel-server modules) are considered one type of server
port, whereas server ports on ISMs are considered a different type.
Interface allocation depends on the types of tunnel-service interface created on the
router. For more information about the types of tunnel-service interfaces, see "Types of
Tunnel-Service Interfaces" on page 208 .

Static IP Tunnel-Service Interfaces

You can configure and delete static IP tunnel-service interfaces.
When you configure a static tunnel-service interface, the router automatically assigns
that interface to a particular module. If that module becomes unavailable, the router
attempts to reassign the interface to an available module. If no module is currently
Chapter 6: Managing Tunnel-Service and
IPSec-Service Interfaces
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