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

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
AT&T/DSL--->PPPoE-Cisco1760---->PIX501--->LAN

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:
  PPP authentication debugging is on
  PPP protocol errors debugging is on
  PPP protocol negotiation debugging is on
  PPP forwarding events debugging is on
Router#
*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
!
boot-start-marker
boot-end-marker
!
!
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
 half-duplex
 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 xxxxxx@att.net
 ppp chap password xxxxxxxxxxxxxxxxxxxxxxxx
 ppp pap sent-username xxxxxx@att.net password xxxxxxxxxxxxxxxxxxxxxxxxxx

ip classless
ip route 0.0.0.0 0.0.0.0 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
!
control-plane
!
!
line con 0
 speed 115200
line aux 0
line vty 0 4
 login
!
end

Router#