Cisco 1760 PPPoE error - "PPP: Outbound cdp packet dropped"?

Posted on 2007-10-08
Last Modified: 2013-12-14
Please advice what i need to do in order to fix the following error msg's below.
Here is the brief description of my setup:

* ISP: AT&T DSL with 5 static IP addresses
* Router: Cisco 1760, IOS 124-3 entbasek9
* PPPoe over Ethernet

Overall everything seems to be working fine, Im able to browse internet and do everything else however, I see many of the error msg's below posted on the router end every few second. Please advice why do i get these error's and how to fix it.

Router# show debug
  PPP authentication debugging is on
  PPP protocol errors debugging is on
  PPP protocol negotiation debugging is on
  PPP forwarding events debugging is on
*Mar  5 00:08:28.107: Vi1 PPP: Outbound cdp packet dropped
*Mar  5 00:08:54.338: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:08:54.350: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:08:54.374: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:08:54.778: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:08:55.780: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:09:21.057: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:09:28.109: Vi1 PPP: Outbound cdp packet dropped
*Mar  5 00:10:28.111: Vi1 PPP: Outbound cdp packet dropped
*Mar  5 00:11:28.114: Vi1 PPP: Outbound cdp packet dropped
*Mar  5 00:12:28.116: Vi1 PPP: Outbound cdp packet dropped
*Mar  5 00:13:28.118: Vi1 PPP: Outbound cdp packet dropped
*Mar  5 00:13:49.293: %PQUICC_FE-5-LATECOLL: PQUICC/FE(0/0), Late collision
*Mar  5 00:14:28.121: Vi1 PPP: Outbound cdp packet dropped
Full router configuration:
Router#show config
Using 1306 out of 29688 bytes
version 12.4
service tiec
service password-encryption
vice timestamps log datetime msec
service password-encryption
hostname Router
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
vpdn enable
interface FastEthernet0/0
 ip address 76.x.x.x 255.255.255.x
 ip nat inside
 speed auto
interface FastEthernet0/1
interface FastEthernet0/2
interface FastEthernet0/3
interface FastEthernet0/4
interface Ethernet1/0
 no ip address
 pppoe enable
 pppoe-client dial-pool-number 1
interface Vlan1
 no ip address
interface Dialer1
 ip address negotiated
 ip mtu 1492
 ip nat outside
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp authentication chap callin
 ppp chap hostname
 ppp chap password xxxxxxxxxxxxxxxxxxxxxxxx
 ppp pap sent-username password xxxxxxxxxxxxxxxxxxxxxxxxxx

ip classless
ip route Dialer1
no ip http server
no ip http secure-server
ip nat inside source list 1 interface Dialer1 overload
access-list 1 permit 76.x.0.0 0.0.0.x
dialer-list 1 protocol ip permit
line con 0
 speed 115200
line aux 0
line vty 0 4

Question by:netgt
    1 Comment
    LVL 9

    Accepted Solution

    cdp is Cisco Discovery Protocol.
    You can disable this on your internal & external interfaces with the "no cdp enable" command, or at global level with "no cdp run"
    As for late collisions, fix the speed & duplex on fastethernet0/0 to whatever the switch is set to, rather than using "auto", possibly not negotiating properly.


    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Highfive Gives IT Their Time Back

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Suggested Solutions

    I recently updated from an old PIX platform to the new ASA platform.  While upgrading, I was tremendously confused about how the VPN and AnyConnect licensing works.  It turns out that the ASA has 3 different VPN licensing schemes. "site-to-site" …
    Problem Description:   Couple of months ago we upgraded the ADSL line at our branch office from Home to Business line. The purpose of transforming the service to have static public IP’s. We were in need for public IP’s to publish our web resour…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    760 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    11 Experts available now in Live!

    Get 1:1 Help Now