PPP Multilink on an 1800

[MattLemon]

Hi,

I've just moved from a 1721 with a serial connection to an 1800 with two serial connections. I have the router up and working with the original IP line and now I want to configure the extra line and use PPP Multilink to aggregate the two.

I've tried to follow some of the cisco documentation but's it's a bit over my head. I'm waiting on my ISP to give me the IP address and subnet for the second serial interface but when they do, how do I go about it ?

TIA,

Matt

 

[MattLemon]

This is the config that I've tried but it doesn't work, do I need to get my ISP at the other end to do anything ?

Cheers,

Matt

Building configuration...

Current configuration : 1634 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname xxx
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$i/Yq$jtzxcvvFyao/QHq01bqL0
!
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
!
!
no ip domain lookup
!
!
!
!
interface Multilink1
ip address xxx.xxx.xxx.xxx 255.255.255.252
ppp multilink
ppp multilink group 1
!
interface FastEthernet0/0
description *** FE Connection to Firewall ***
ip address xxx.xxx.xxx.xxx 255.255.255.248
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
description *** Connection to BT ESNT 2080 ***
bandwidth 2048
no ip address
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Serial0/1/0
description *** Connection to BT ESNT 102772 ***
bandwidth 2048
no ip address
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 1
!
ip classless
ip route 0.0.0.0 0.0.0.0 xxx.xxx.xxx.xxx
!
no ip http server
!
access-list 23 permit xxx.xxx.xxx.xxx
access-list 23 permit xxx.xxx.xxx.xxx
access-list 23 permit xxx.xxx.xxx.xxx
snmp-server community xxx.xxx.xxx.xxx
snmp-server community private RW
snmp-server enable traps tty
!
control-plane
!

!
line con 0
password yyy
login
line aux 0
line vty 0 4
access-class 23 in
exec-timeout 15 0
password yyy
login
!
end

 

[JOAMON]

Your ISP must set this up on their side as well. You should not have two IP addresses for the serial links. Your ISP will bond them in the same manner with only only one set of IP routeable block used. Your config looks ok but I would add "ppp multilink fragment disable" to the multilink interface.

 

[MattLemon]

Great, thanks for the tip.

Matt