01-02-2009 02:13 PM - edited 03-04-2019 03:18 AM
I have been tasked with setting up our first PPPoE DSL connection. We have it up and running, but the speeds seem to be rather slow, and would like someone to review the config and see if I am missing something that would improve the overall speed of the pppoe connections. During download tests, we found that we would drop from 12MB(standard ethernet) to 4.5MB (PPPoE). So any help would be appreciated. Here is relevant information:
7206vxr with a NPE-G1 Card
Version: c7200-advipservicesk9_li-mz.124-20.T1
Relevant Configuration information:
bba-group pppoe global
virtual-template 41
sessions per-mac limit 2
interface Loopback41
ip address 192.168.41.1 255.255.255.255
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
media-type rj45
no negotiation auto
interface GigabitEthernet0/2.2
description DSL-Data Traffic
encapsulation dot1Q 4
pppoe enable group global
interface Virtual-Template41
description New Subnet 41 Behind Occam
mtu 1454
ip unnumbered Loopback41
no ip route-cache cef
no ip route-cache
ip tcp adjust-mss 1414
no logging event link-status
load-interval 30
no peer default ip address
ppp authentication pap
!
01-03-2009 06:58 AM
Hello Todd,
if there is an ATM cloud in the middle the ATM SAR (Segmentation and Reassembly) required to create ATM cells for each PPPoE PDU can reduce the performance for a single session.
May you describe the whole network from DSL to C7206VXR ?
Hope to help
Giuseppe
01-05-2009 01:41 PM
The current setup is:
DSL Modem
|
PPPoA
|
Occam
|
PPPoE
|
Cisco 7206
We currently have a couple of old pieces of equipment that the DSL modems currently run through via PPPoA and work fine. But we are now moving to the Occam for more functionality and we were hoping to minimize the transition by not having to touch each remote modem. That's the reason for the PPPoA into PPPoE.
So is this transition the cause for the drop in speed?
Todd
01-05-2009 02:39 PM
On an additional note, if we plug a laptop into a directly connected port on the 7206 that are both configured for PPPoE, the speeds are slowed down as well.
Thoughts....
01-06-2009 02:16 AM
Hello Todd,
in the virtual-template config you have disabled CEF and fast switching
no ip route-cache cef
no ip route-cache
I would try to reenable them (this should have an impact on scalability)
see for example
note2:
you have PPPoA on the DSL to the Occam, then the OCCAM have a PPPoE session with the C7206.
the OCCAM is an ip dslam
see
http://www.occamnetworks.com/pdf/CiscoSvcFlxOccam.pdf
I wonder if the PPPoE session is needed from occam to the c7206 or it could be a simple IP connection.
Hope to help
Giuseppe
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