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Redundancy and Tunnel Distribution
References
Copyright © 2010, Juniper Networks, Inc.
You can also create IP tunnels on router modules that support shared tunnel-server
ports. You can configure (provision) a shared tunnel-server port to use a portion of the
module's bandwidth to provide tunnel services. For a list of the modules that support
shared tunnel-server ports, see the ERX Module Guide.
For information about configuring tunnel services on dedicated and shared tunnel-server
ports, see Managing Tunnel Service and IPSec Service Interfaces in JunosE Physical Layer
Configuration Guide.
All line modules forward traffic to IP tunnels. For information about which line modules
accept traffic for IP tunnels, see the ERX Module Guide.
E120 Router and E320 Router
To create IP tunnels on an E120 router or an E320 router, you must install an ES2 4G line
module (LM) or an ES2 10G ADV LM with an ES2-S1 Service I/O adapter (IOA), or an IOA
that supports the use of shared tunnel-server ports. For information about installing
modules in these routers, see the E120 and E320 Hardware Guide.
The combination of an ES2 4G LM or an ES2 10G ADV LM with an ES2-S1 Service IOA
provides a dedicated tunnel-server port that is always configured on the IOA. Unlike SMs,
the ES2 4G LM and the ES2 10G ADV LM require the ES2-S1 Service IOA to condition it
to receive and transmit data to other line modules. The ES2-S1 Service IOA also does
not have ingress or egress ports.
You can also create IP tunnels on IOAs that support shared tunnel-server ports. You can
configure (provision) a shared tunnel-server port to use a portion of the bandwidth of
the IOA to provide tunnel services. For a list of the IOAs that support shared tunnel-server
ports, see the E120 and E320 Module Guide.
All line modules forward traffic to tunnels. For information about the IOAs that accept
traffic for tunnels, see the E120 and E320 Module Guide.
For information about the redundancy and tunnel distribution mechanisms supported
for SMs, the ES2-S1 Service IOA, and shared tunnel-server ports, see Tunnel Service
Interface Considerations in JunosE Physical Layer Configuration Guide.
For more information about IP tunnels, see the following documents:
RFC 791—Internet Protocol DARPA Internet Program Protocol Specification (September
1981)
RFC 1700—Assigned Numbers (October 1994)
RFC 1701—Generic Routing Encapsulation (October 1994)
RFC 1702—Generic Routing Encapsulation over IPv4 Networks (October 1994)
RFC 2003—IP Encapsulation within IP (October 1996)
RFC 2784—Generic Routing Encapsulation (GRE) (March 2000)
Chapter 9: Configuring IP Tunnels
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