4.2 Configure, verify, and troubleshoot PPPoE client-side interfaces using local authentication

PPPoE constructs a virtual dialler interface to create a PPPoE session. This is similar to PPP over serial except that the frames are encapsulated in Ethernet frames.

When diagnosing problems with PPPoE keep in mind that the dialler interface and the physical interface are separate configuration.

See Chapter 15 in the CCNA R&S 200-105 Official Cert guide.

To configure PPPoE on the client:

!
interface Ethernet0/0
 mac-address 0200.0000.0011
 no ip address
 pppoe enable group global
 pppoe-client dial-pool-number 1
!
interface Dialer2
 mtu 1492
 ip address negotiated
 encapsulation ppp
 dialer pool 1
 ppp chap hostname clinetworking
 ppp chap password 0 cisco
!

To configure a server (for lab work):

username clinetworking password 0 cisco
!
bba-group pppoe WOGroup
virtual-template 1
! 
interface Ethernet0/0
 mac-address 0200.0000.0022
 no ip address
 pppoe enable group WOGroup
!
interface Virtual-Template1
 ip address 10.1.3.1 255.255.255.0
 peer default ip address pool WOPool
 ppp authentication chap callin
!
ip local pool WOPool 10.1.3.2 10.1.3.254
ip forward-protocol nd
!

 

To troubleshoot PPPoE use the following commands:

Router#show pppoe session 
 1 client session

Uniq ID PPPoE RemMAC Port VT VA StateSID LocMAC VA-st Type
 N/A 2 0200.0000.0022 Et0/0 Di2 Vi2 UP 
 0200.0000.0011 UP 
Router#show int dial
Router#show int dialer 2
Dialer2 is up, line protocol is up (spoofing)
 Hardware is Unknown
 Internet address is 10.1.3.3/32
 MTU 1492 bytes, BW 56 Kbit/sec, DLY 20000 usec, 
 reliability 255/255, txload 1/255, rxload 1/255
 Encapsulation PPP, LCP Closed, loopback not set
 Keepalive set (10 sec)
 DTR is pulsed for 1 seconds on reset
 Interface is bound to Vi2
 Last input never, output never, output hang never
 Last clearing of "show interface" counters 00:19:52
 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
 Queueing strategy: fifo
 Output queue: 0/40 (size/max)
 5 minute input rate 0 bits/sec, 0 packets/sec
 5 minute output rate 0 bits/sec, 0 packets/sec
 37 packets input, 3150 bytes
 199 packets output, 5430 bytes
Bound to:
Virtual-Access2 is up, line protocol is up 
 Hardware is Virtual Access interface
 MTU 1492 bytes, BW 56 Kbit/sec, DLY 20000 usec, 
 reliability 255/255, txload 1/255, rxload 1/255
 Encapsulation PPP, LCP Open
 Stopped: CDPCP
 Open: IPCP
 PPPoE vaccess, cloned from Dialer2
 Vaccess status 0x44, loopback not set
 Keepalive set (10 sec)
 Interface is bound to Di2 (Encapsulation PPP)
 Last input 00:00:07, output never, output hang never
 Last clearing of "show interface" counters 00:13:51
 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
 Queueing strategy: fifo
 Output queue: 0/40 (size/max)
 5 minute input rate 0 bits/sec, 0 packets/sec
 5 minute output rate 0 bits/sec, 0 packets/sec
 193 packets input, 4910 bytes, 0 no buffer
 Received 0 broadcasts (0 IP multicasts)
 0 runts, 0 giants, 0 throttles 
 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
 188 packets output, 4653 bytes, 0 underruns
 0 output errors, 0 collisions, 0 interface resets
 0 unknown protocol drops
 0 output buffer failures, 0 output buffers swapped out
 0 carrier transitions
Router#show int e0/0
Ethernet0/0 is up, line protocol is up 
 Hardware is AmdP2, address is 0200.0000.0011 (bia aabb.cc00.0100)
 MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec, 
 reliability 255/255, txload 1/255, rxload 1/255
 Encapsulation ARPA, loopback not set
 Keepalive set (10 sec)
 ARP type: ARPA, ARP Timeout 04:00:00
 Last input 00:00:40, output 00:00:01, output hang never
 Last clearing of "show interface" counters never
 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
 Queueing strategy: fifo
 Output queue: 0/40 (size/max)
 5 minute input rate 0 bits/sec, 0 packets/sec
 5 minute output rate 0 bits/sec, 0 packets/sec
 285 packets input, 28727 bytes, 0 no buffer
 Received 65 broadcasts (0 IP multicasts)
 0 runts, 0 giants, 0 throttles 
 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
 0 input packets with dribble condition detected
 402 packets output, 40605 bytes, 0 underruns
 0 output errors, 0 collisions, 1 interface resets
 13 unknown protocol drops
 0 babbles, 0 late collision, 0 deferred
 0 lost carrier, 0 no carrier
 0 output buffer failures, 0 output buffers swapped out

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