Cisco T1 Internet Config

Hi,

I am pretty new to cisco router config, but I have looked at various router
configuration from our office existing router. I am just trying to
understand the config done by our previous employee in our remote office, so
please help me out. This is a T1 internet line by MCI and use unnumbered in
their serial interface, here is what I don't understand as most of the line
in our main office have ip on their serial interface.

The line under Serial0/0
encapsulation frame-relay IETF -- Do I need this line? This is not a frame
relay but an internet line only.

Also, the interface Serial0/0.1 part
interface Serial0/0.1 point-to-point -- Do I need this 4 lines at all?
bandwidth 1536
ip unnumbered FastEthernet0/0
frame-relay interface-dlci 500 IETF

I just need a bare minimum for internet access only, and here is the
complete config (removed lines with password and line)
Please help, thank you so much.

C2620-R2-R23#sh running-config
Building configuration...

Current configuration : 1528 bytes
!
! No configuration change since last restart
!
version 12.3
service timestamps debug datetime localtime
service timestamps log datetime localtime
service password-encryption
!
hostname C2620-R2-R23
!
boot-start-marker
boot-end-marker
!
logging buffered 8196 debugging
!
memory-size iomem 15
clock timezone PST -8
clock summer-time PDT recurring
no aaa new-model
ip subnet-zero
ip cef
!
ip audit po max-events 100
!
interface FastEthernet0/0
description To Office Ethernet R23
ip address 11.111.111.111 255.255.255.240
duplex auto
speed auto
!
interface Serial0/0
bandwidth 1536
no ip address
encapsulation frame-relay IETF
no fair-queue
service-module t1 timeslots 1-24
frame-relay lmi-type ansi
!
interface Serial0/0.1 point-to-point
bandwidth 1536
ip unnumbered FastEthernet0/0
frame-relay interface-dlci 500 IETF
!
no ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/0.1
!
ntp clock-period 17180386
ntp server 207.46.130.100 prefer
!
end


--
Thanks,
Alan


.

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