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Route Maps & ADSL Load Sharing & Failover



As demonstrated on the network diagram:

  • I have a 1841 connected on 2 ADSL lines on different ISPs with route maps & cef
  • I have an 3650e switch connected on the router on a single interface
  • 1841 is connected to 3560e using
  • 3560e hosts segmented into different subnets (VLSM)
  • 3560e publishes on 1841 using EIGRP

Attached you may find the router's configuration.


I would kindly request:

  1. Ways to troubleshoot why ADSL lines are slow
  2. Any suggestions for fixing 1841's configuration


Thank you in advance for any support provided.

Everyone's tags (1)
New Member

I got a config like yours

I got a config like yours except i have set interface on the route maps and i do not use the algorithm on cef. It's pretty quck.  My config on your router would be

no ip cef load-sharing algorithm include-ports source destination

route-map ADSL0 permit 10
 match ip address 11 or 12 14
 set interface Dialer0
route-map ADSL1 permit 10
 match ip address 11 or 12 14
 set interface Dialer1



Hope it helps.

Thanks a lot for your support

Thanks a lot for your support.

I will try the suggested solution today and then post the results

Thank you for the suggestion.

Thank you for the suggestion. 

Tried the solution suggested but it did not work.

Hi ,  Check for CEF load

Hi ,

  Check for CEF load balancing status , if everything look good from CEF perspective . Check your application access by bring down one ASDL link , ensure traffic is being sent on only one ASDL link .Then check for application access on speed . Do it vice versa with another link .


Check on the match statement , with your configuration among three ACL only one will be matched at a time . 




  • If a match command refers to several objects in one command, either of them should match (the logical OR algorithm is applied). For example, in the match ip address 101 121 command, a route is permitted if it is permitted by access list 101 or access list 121.


Hello, I have tried



I have tried troubleshooting cef, and you may find the results attached.

The problem is that in cef all configurations seem to be ok.

My only concern is the following entry:

#sh ip cef  drop

#sh ip cef receive


performed some fixes i.e.

performed some fixes i.e. removed auto-summary from eigrp in order to have a better view of the routing table, but the problem still persists.

Another thing that I managed to trace by debugging cef:

*May 14 20:35:08.939: CEF-Drop: Packet from (Di0) to, Virtual Fragment Reassembly feature
*May 14 20:35:09.231: CEF-Drop: Packet from (Di0) to, Virtual Fragment Reassembly feature