Dynamic Subscriber Interface Configuration Example; Figure 27: Gre Tunnel Dynamic Subscriber Interface Configuration - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BROADBAND ACCESS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

JunosE 11.3.x Broadband Access Configuration Guide

Figure 27: GRE Tunnel Dynamic Subscriber Interface Configuration

Dynamic Subscriber Interface Configuration Example

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The procedure in this section shows how to configure dynamic subscriber interfaces by
using the same loopback interface referenced by multiple unnumbered IP interfaces.
Instead of assigning a different IP address to each physical interface, this example assigns
an IP address to a loopback interface (loopback 0). Each physical interface is then
configured as an unnumbered IP interface, referencing the same loopback interface. This
example uses a DHCP local server.
This approach has the following benefits:
A loopback interface provides a stable IP address that can minimize the impact if a
physical interface in the network goes down.
Unnumbered IP interfaces preserve valuable IP address space.
To configure dynamic subscriber interfaces, perform the following steps:
Enable the DHCP local server for standalone mode.
1.
host1(config)#service dhcp-local standalone
Access DHCP Local Pool Configuration mode for the local address pool.
2.
host1(config)#ip dhcp-local pool ispWestford
Specify the enduring IP addresses that the DHCP local server can assign from the
3.
local address pool.
host1(config-dhcp-local)#network 10.20.0.0 255.255.192.0
Specify the router to forward traffic from the IP addresses to destinations on other
4.
subnets.
host1(config-dhcp-local)#default-router 10.20.32.1
Exit DHCP Local Pool Configuration mode.
5.
host1(config-dhcp-local)#exit
Configure a loopback interface.
6.
host1(config)#interface loopback 0
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