Catalyst 2900 XL and PPPoE

[DanielBaeza]

Hello all,

I'm making a WiFi network using PPPoE to register all clients.

I'm having problems to use a Cisco Catalyst 2900XL Switch to concentrate all WiFi APs with the PPPoE server.

If I connect the AP directly to the PPPoE server, it works perfectly, but if I connect the AP to the switch and then the PPPoE server to the switch too, it stop working and cant connect from the client to the PPPoE server.

A really bad draw about it:

                         WiFi                             

Client Station (--  -  -  -  --) Base Station -> PPPoE server. ||  This works perfectly. I can connect a computer to the Client Station RJ45 port and can create and use a PPPoE connection without problem.

                         WiFi

Client Station (--  -  -  -  --) Base Station -> Cisco Catalyst 2900XL <- PPPoE server.

The computer connected to the Client Station cant anymore connect to the PPPoE server.

What I'm doing wrong?

Thanks in advance.

[Peter Paluch]

Hello Daniel,

Can you post the configuration of the switch? Also, what is the type of the WiFi AP? I assume it is not using any sort of VLAN tagging on its Ethernet port, right?

Best regards,

Peter

[DanielBaeza]

Hello Peter,

This is my actual running-config:

Current configuration:
!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log datetime
service password-encryption
!
hostname CAT-CLI-TORREVIEJA
!
enable password 7 ****
!
!
!
!
!
!
ip subnet-zero
!
!
!
interface FastEthernet0/1
 duplex full
!
interface FastEthernet0/2
 duplex full
 speed 100
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24

 duplex full
 speed 100
!
interface VLAN1
 ip address PublicIPAddress 255.255.254.0
 no ip directed-broadcast
 no ip route-cache
!
no ip http server
logging facility local4
snmp-server engineID local 0000000902000002FD34D540
snmp-server community **** RO
snmp-server community **** RW
!
line con 0
 password 7 ***
 login
 transport input none
 stopbits 1
line vty 0 4
 password 7 ****
 login
line vty 5 14
 password 7 ****
 login
line vty 15
 login
!
ntp clock-period 22518026
ntp server 130.206.3.166
end

Sorry but I dont know if the AP does any kind of VLAN taggin. Its a Ubiquiti one.

[Peter Paluch · Accepted solution]

Daniel,

A couple of suggestions:

• Do not configure the speed and duplex manually. This can cause problems if the opposite device is not manually configured for the same settings. Unless you are absolutely sure that using the fixed speed/duplex settings are mandatory in order for your connections to work, leave the ports to automatically negotiate the duplex and speed setting with their peers.
• On all ports you are using, enter the following commands:
  • switchport mode access
  • switchport access vlan 1
  • spanning-tree portfast

Give it a try and let us know.

Best regards,

Peter

[DanielBaeza]

Thank you very much Peter, Im really a dumb. Was the manually configured speed and duplex. Its an old switch we had

gathering dust in the warehouse and didnt notice the speed/duplex configuration.

Thank you very much.

[Peter Paluch]

Daniel,

No problem at all. You are welcome. I am glad it worked.

Best regards,

Peter