CCIE Pursuit Blog

February 18, 2008

Internetwork Expert Volume II: Lab 12 – Section 1

Troubleshooting – 3 Points

There are three initial faults in this lab.  The troubleshooting section has this interesting requirement:

“Use the minimum commands needed to solve these issues.”

1) PPP configuration on r1

I had issues right away.  The initial configuration for r1’s s0/1 interface is as follows: 

interface Serial0/1
 ip address 129.1.13.1 255.255.255.0
 ppp pap sent-username PPP password 0 CISCO
 no shutdown

The problem with this is that the router will not accept this configuration because it’s missing “encap ppp” and “ppp authentication pap”:

r1(config-if)#interface Serial0/1
r1(config-if)# ip address 129.1.13.1 255.255.255.0
r1(config-if)# ppp pap sent-username PPP password 0 CISCO
                        ^
% Invalid input detected at ‘^’ marker.

The interface will end up with only the IP address configured:

interface Serial0/1
 ip address 129.1.13.1 255.255.255.0

This is where the “minimal configuration” requirement comes into play.  r1 and r2 each have point-to-point serial connections that terminate on r3.  r3 is running ppp with pap authentication.  It is expecting a username of “PAP” and a password of “CISCO”.

r1:
interface Serial0/1
 ip address 129.1.13.1 255.255.255.0   <- HDLC encapsulation (default)

r2:
interface Serial0/1/0
 ip address 129.1.23.2 255.255.255.0
 encapsulation ppp
 ppp pap sent-username PPPpassword 0 CISCO  <-wrong username

r3:
username PAP password 0 CISCO
!
interface Serial0/2:0
 ip address 129.1.13.3 255.255.255.0
 encapsulation ppp
 ppp authentication pap
!
interface Serial0/3:0
 ip address 129.1.23.3 255.255.255.0
 encapsulation ppp
 ppp authentication pap

The solution guide says that the fix is to change the password on r3 from “PAP” to “PPP”.  That would make sense and would meet the “minimum configuration” requirement IF the PPP configuration on r1 wasn’t messed up.  Due to the intial configuration snafu, I did the following:

r1:
r1(config)#int s0/1
r1(config-if)#enc ppp
r1(config-if)#ppp pap sent-username PAPpass CISCO

r2:
r2(config-if)#noppp pap sent-username PPPpassword 0 CISCO
r2(config-if)#ppp pap sent-user PAPpass CISCO

2) sw1’s SVI interface Vlan7 should be Vlan 17

sw1#sh ip int br | e ass
Interface              IP-Address      OK? Method Status                Protocol
Vlan7                  129.1.17.7      YES NVRAM  down                  down

after:
sw1#sh ip int br | e ass
Interface              IP-Address      OK? Method Status                Protocol
Vlan17                 129.1.17.7      YES manual down                  down

3) r4’s fa0/1 has wrong IP address

I didn’t catch this one until later.  The first octet is incorrect:

interface FastEthernet0/1
 ip address 192.1.46.4 255.255.255.0

After:
interface FastEthernet0/1
 ip address 129.1.46.4 255.255.255.0 

4?)  sw1’s fa0/7 and fa0/8 should not be assigned to a VLAN???

Task 2.1 requires you to configure sw1 to match this output exactly:

sw1(config)#do sh vlan br | e (unsup|^1 |^ )

VLAN Name                             Status    Ports
—- ——————————– ——— ——————————-
3    VLAN0003                         active    Fa0/3
17   VLAN0017                         active    Fa0/1
22   VLAN0022                         active
33   VLAN0033                         active
38   VLAN0038                         active
45   VLAN0045                         active
46   VLAN0046                         active
58   VLAN0058                         active    Fa0/5 

Here’s what I had:

sw1(config-if)#do sh vlan br | e (unsup|^1 |^ )

VLAN Name                             Status    Ports
—- ——————————– ——— ——————————-
3    VLAN0003                         active    Fa0/3
17   VLAN0017                         active    Fa0/1, Fa0/7, Fa0/8
22   VLAN0022                         active
33   VLAN0033                         active
38   VLAN0038                         active
45   VLAN0045                         active
46   VLAN0046                         active
58   VLAN0058                         active    Fa0/5

sw1(config-if)#do sh run int fa0/7
interface FastEthernet0/7
 switchport access vlan 17 

sw1(config-if)#do sh run int fa0/8
interface FastEthernet0/8
 switchport access vlan 17

I defaulted the interfaces and my output match the requirement.  Unfortunately, this would come back to bite me in the butt later.  I think that the problem was a misprint in the lab guide and not an initial fault.

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1 Comment »

  1. […] Well….they were initially, but I thought that that was an intial config error (see error 4?) […]

    Pingback by Internetwork Expert Volume II: Lab 12 - Section 2 « CCIE Pursuit — February 18, 2008 @ 1:57 pm | Reply


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