554 Chapter 8: WAN Protocols and Design
The configuration is simple in comparison with the protocol concepts. All default settings (IOS
version 12.0) were used and are as follows:
·
The LMI type is automatically sensed.
·
The encapsulation is Cisco instead of IETF.
·
PVC DLCIs are learned via LMI status messages.
·
Inverse ARP is enabled (by default) and is triggered when the status message declaring
that the VCs are up has been received.
In some cases, the default values will not be appropriate. For instance, if one router was not a
Cisco router and did not support Cisco encapsulation, then IETF encapsulation would be
required. For the purpose of showing an alternate configuration, suppose that the following
requirements were added:
·
The Raleigh router requires IETF encapsulation on both VCs.
·
Mayberry's LMI type should be ANSI; LMI autosense should not be used.
Example 8-5
Mount Pilot Configuration
ipx routing 0200.bbbb.bbbb
!
interface serial0
encapsulation frame-relay
ip address 199.1.1.2 255.255.255.0
ipx network 199
!
interface ethernet 0
ip address 199.1.11.2 255.255.255.0
ipx network 2
!
router igrp 1
network 199.1.1.0
network 199.1.11.0
Example 8-6
Raleigh Configuration
ipx routing 0200.cccc.cccc
!
interface serial0
encapsulation frame-relay
ip address 199.1.1.3 255.255.255.0
ipx network 199
!
interface ethernet 0
ip address 199.1.12.3 255.255.255.0
ipx network 3
!
router igrp 1
network 199.1.1.0
network 199.1.12.0
ch08.fm Page 554 Monday, March 20, 2000 5:17 PM