Enterasys Networks Security Router X-PeditionTM - Manual (Page 320)

Configuration Examples
13-8 Configuring ADSL
Inverse ARP
The XSR employs Inverse ARP as defined in RFC-1293 with modifications specified by RFC-2225
(Classical IP over ATM). Inverse ARP is supported for PVCs which are configured as Routed IPv4
circuits (per RFC-1483), using LLC/SNAP encapsulation. This implementation will not send an
ATM hardware address and addresses received will be discarded. Only the IP address is used.
The XSR will respond to but not send Inverse ARP requests.
QoS
The XSR supports QoS functionality over an ADSL line.
SNMP
The ADSL interface creates and maintains entries in the Interface Table as required by NetSight.
Entries will be made in the table for the following:
• ADSL Driver
• ATM Interface
• ATM Sub-Interface
• IP Interface
• PPP (when configured)
Configuration Examples
The following examples describe PPPoE, PPPoA, and IPoA configuration scenarios. When
configuring PPPoE for the first time, be sure to insert the DSP CompactFlash card in the
CompactFlash slot (refer to the XSR Getting Started Guide for further instructions).
PPPoE
The following commands configure a sample PPPoE topology. The first set configures the LAN
interface with directed broadcasts prohibited..
XSR(config)#interface FastEthernet1
XSR(config-if)#ip address 192.168.1.1 255.255.255.0
XSR(config-if)#no ip directed-broadcast
XSR(config-if)#no shutdown
The commands below configure the ATM interface and sub-interface with a negotiated IP
address, PAP username and password, and ban keepalives. They also reset default PVC VPI and
Note: ADSL configuration on XSR 1200 Series routers is significantly different than for XSR 1800
and 3000 routers. For example, only interfaces FastEthernet 0:<1-2>.<1-30> and ATM
0.<1-30> are configurable on the XSR 1200 Series. For more information, refer to the XSR 1220/
1235 Getting Started Guide.
Note: All ATM examples in this chapter reference Ethernet interfaces on XSR 1800/3000 Series
routers.