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mbavisi

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Multilink ppp Speed Problem


I have a problem when i do multilink ppp to bond 2 dsl lines.

One of the lines is a 2meg SDSL and the other line is a 0.5 meg IP stream ADSL.

the 2meg on its own , runs at 2meg speed when i do a line test, when i run a line test on the 0.5 meg ADSl, i get 0.5meg speed.

When when i run a line test when the 2 lines are part of MLP bundle, i get 1 meg speed.

It doesnt seen to make any sense, when i check the lines on the LNS, i can see they have formed an MPL bundle...so why do i get 1meg speed when the lines are combined as a bundle?

MY config on the cisco router is below.....



!
controller DSL 0/1/0
 mode atm
 line-term cpe
 line-mode 2-wire line-zero
 dsl-mode shdsl symmetric annex B
 line-rate auto
!
!
!
interface FastEthernet0/0
 ip address 192.168.16.1 255.255.255.240
 ip nat inside
 duplex auto
 speed auto
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface ATM0/0/0
 no ip address
 no atm ilmi-keepalive
 dsl operating-mode auto
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!
interface ATM0/1/0
 no ip address
 no atm ilmi-keepalive
 pvc 0/38
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
!
interface Dialer0
 ip address negotiated
 ip nat outside
 encapsulation ppp
 dialer pool 1
 dialer persistent
 dialer-group 1
 ppp authentication chap callin
 ppp chap hostname xxxxxxxxxxxxxxxx
 ppp chap password 0 test
 ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
!
!
no ip http server
no ip http secure-server
ip nat inside source list 101 interface Dialer0 overload
!
access-list 101 permit ip 192.168.16.0 0.0.0.15 any
dialer-list 1 protocol ip permit
!
!
!
control-plane
!
!
!

Avatar of pjtemplin
pjtemplin

Bzzzt...1Mbps is the right answer.

Half the traffic goes onto link 1, half the traffic goes onto link 2.

At 500kbps on link 1 and 500kbps on link 2, the 500kbps link is full.  You won't be able to exceed 1Mbps with this configuration.

For 2.5Mbps, assuming they are private lines and you operate the routers on both ends, you can do EIGRP routing over the links with variance of at least 4 to get unequal-cost load sharing, or you can get real fancy (with fancy hardware) and do MPLS Traffic Engineering, but that's way overkill for your application.
Avatar of mbavisi

ASKER

nice one pal, can you give me the details of how to set up eigrp to do unequal load sharing.


Many thanks
ASKER CERTIFIED SOLUTION
Avatar of pjtemplin
pjtemplin

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