n00b-How to config multilink to single link on 2801 router

[Ceez]

Hello everyone,

disclaimer...n00b

One of our remote offices is going from a multilink (3xT1s) to a single link T1 configuration. The router was originally setup by our network ops guy (who's no longer with us, nor reachable) and we have no idea how to change the configuration. The router is a 2801 running version 12.4(1c)

Dont know of this additional information matters, but this child domain is part of an mpls network.

I am pasting the running config in hopes that someone can help me or guide me in the right direction. Let me know if you need additional info.

Thanks again.




!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname 2801ROUTER
!
boot-start-marker
boot-end-marker
!
no logging buffered
enable secret
enable password
!
no aaa new-model
!
resource policy
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
ip cef
!
!
no ip dhcp use vrf connected
!
!
!
!
!
!
interface Multilink1
description internet via PROVIDER
ip address OUR.EXTERNAL.IP.ADDRESS 255.255.255.252
no cdp enable
ppp multilink
ppp multilink group 1
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 10.201.12.1 255.255.252.0
speed auto
half-duplex
no mop enabled
!
interface Serial0/1/0
description MLPPP
bandwidth 1536
no ip address
no ip redirects
no ip proxy-arp
encapsulation ppp
tx-ring-limit 26
tx-queue-limit 26
no fair-queue
no cdp enable
ppp multilink
ppp multilink group 1
!
interface Serial0/2/0
description MLPPP
bandwidth 1536
no ip address
no ip redirects
no ip proxy-arp
encapsulation ppp
tx-ring-limit 26
tx-queue-limit 26
no cdp enable
ppp multilink
ppp multilink group 1
!
interface Serial0/3/0
description MLPPP
bandwidth 1536
no ip address
no ip redirects
no ip proxy-arp
encapsulation ppp
tx-ring-limit 26
tx-queue-limit 26
no cdp enable
ppp multilink
ppp multilink group 1
!
ip classless
ip route 0.0.0.0 0.0.0.0 Multilink1
!
ip http server
!
dialer-list 1 protocol ip permit
!
control-plane
!
banner login ^C ^C
banner motd ^C
***************************************************************
NOTICE: This system is the property of the company,
and is for authorized use only. Unauthorized access is
a VIOLATION of FEDERAL LAW. All software, data transactions,
and electronic communication are subject to monitoring.
***************************************************************
^C
!
line con 0
password
login
line aux 0
line vty 0 4
password
login
!
end

 

[unclerico]

so first of all you want to make sure that this router has an out-of-band connection because when you start to make changes to the serial interfaces you're going to lose connectivity.

1) in global config mode, enter no int mu1
2) identify the physical serial interface that will be used as the sole t1 interface
3) go under that interface in the config and issue no ppp multilink and ip address xxx.xxx.xxx.xxx 255.255.255.252
5) issue ip route 0.0.0.0 0.0.0.0 <next_hop_ip>
4) issue no ip route 0.0.0.0 0.0.0.0 Multilink1

that should do it

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