CCIE Pursuit Blog

January 27, 2008

Internetwork Expert Volume III: Lab 4 – Section 3

WAN Technologies – 11 Points

3.1 Hub and Spoke

For some reason I could not get my Frame Relay hub-and-spoke network to come up.  I quick look at the configuration showed the problem.  This is the fourth initial configuration error:

r3 – Hub:
interface Serial0/0:0
 no ip address
 encapsulation frame-relay
 frame-relay lmi-type ansi <- from initial configuration
interface Serial0/0:0.1 multipoint
 ip address 152.1.123.3 255.255.255.0
 frame-relay map ip 152.1.123.1 301 broadcast
 frame-relay map ip 152.1.123.2 302 broadcast

r3#sh frame lmi | i TYPE
LMI Statistics for interface Serial0/0:0 (Frame Relay DTE) LMI TYPE = ANSI

r2 – Spoke:
r2#sh run | sec Serial0/0/0
interface Serial0/0/0
 no ip address
 encapsulation frame-relay
interface Serial0/0/0.1 point-to-point
 ip address 152.1.123.2 255.255.255.0
 frame-relay interface-dlci 203

r2#sh frame lmi | i TYPE
LMI Statistics for interface Serial0/0/0 (Frame Relay DTE) LMI TYPE = CISCO

r1 – Spoke
r1#sh run | sec Serial0/0
interface Serial0/0
 no ip address
 encapsulation frame-relay IETF
 frame-relay lmi-type cisco <- from initial configuration
interface Serial0/0.1 point-to-point
 ip address 152.1.123.1 255.255.255.0
 frame-relay interface-dlci 103

r1#sh frame lmi | i TYPE
LMI Statistics for interface Serial0/0 (Frame Relay DTE) LMI TYPE = CISCO

I set the LMI type on r3 to cisco (default) as that’s what my Frame Relay switch is running.

frame-relay lmi-type

r3(config-if)#frame lmi-type ?
 cisco
  ansi
  q933a

Nicely played IE.  🙂

task 3.1 : lmi type missing in SG?

3.2 PPPoFR

Crap.  This is another of those subjects that I am weak in.  Luckilly, the IE blog had a recent post that gives a very good overview of how to configure PPPoFR:

Understanding PPP over Frame Relay (PPPoFR)

frame-relay interface-dlci

interface virtual-template

This was actually a very easy configuration as the task did not require PPP authentication.

r4(config)#int virtual-template1
r4(config-if)#ip address 152.1.45.4 255.255.255.0
r4(config-if)#int s0/0
r4(config-if)#frame interface-dlci 405 ?
  ppp       Use RFC1973 Encapsulation to support PPP over FR
  switched  Define a switched DLCI
  <cr>

r4(config-if)#frame interface-dlci 405 ppp ?
  Virtual-Template  Virtual Template interface

r4(config-if)#frame interface-dlci 405 ppp virtual-Template ?
  <1-200>  Virtual-Template interface number

r4(config-if)#frame interface-dlci 405 ppp virtual-Template 1 ?
  <cr>

r4(config-if)#frame interface-dlci 405 ppp virtual-Template 1

r4#show interface virtual-template1
Virtual-Template1 is down, line protocol is down <-expected behavior

  Hardware is Virtual Template interface
  Internet address is 152.1.45.4/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 100000 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 5 seconds on reset
  Last input never, output never, output hang never
  Last clearing of “show interface” counters 00:14:45
  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
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

r4#sh int virtual-access1
Virtual-Access1 is up, line protocol is up
 
  Hardware is Virtual Access interface
  Internet address is 152.1.45.4/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 100000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation PPP, LCP Open
  Open: IPCP
  PPPoFR vaccess, cloned from Virtual-Template1
  Vaccess status 0x44
  Bound to Serial0/0 DLCI 405, Cloned from Virtual-Template1, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 5 seconds on reset
  Last input 00:00:02, output never, output hang never
  Last clearing of “show interface” counters 00:03:54
  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 2000 bits/sec, 2 packets/sec
  5 minute output rate 2000 bits/sec, 2 packets/sec
     153 packets input, 151680 bytes, 0 no buffer
     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     157 packets output, 151616 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

r4#p 152.1.45.5

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 152.1.45.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5),
round-trip min/avg/max = 4/6/8 ms

r4#sh ip route 152.1.45.5
Routing entry for 152.1.45.5/32
  Known via “connected”, distance 0, metric 0 (connected, via interface)
  Routing Descriptor Blocks:
  * directly connected, via Virtual-Access2
      Route metric is 0, traffic share count is 1

Do the same on r5 (different IP address and DLCI obviously) et voila!

The IE solution show that they used a point-to-point subinterface on r4 (no idea why) but not on r5 for this task.  Again, no idea why?

3.3 Point-To-Point

Basic….except that I expected to be able to ping bb1 (54.1.10.254) after this step.  I’ll need to wait until I do some bridging in section 4.

Task 3.3

3.4 PPP

Basic.

3.5 PPP Authentication

Easy task because you are asked to authenticate each other using a hash (CHAP).
 

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