1. NT2640 Unit 10 Activity 1 Handout

2. Frame Relay Troubleshooting Steps
Verify layer 1 Connectivity
Verify layer 2 Connectivity
Verify LMI status
Verify PVC status
Verify Layer 3 Connectivity
Ping Remote Hosts

3. Layer 1 & 2
*Cisco Systems -

4. Step 1 – Layer 1
Verify Layer 1 Connectivity by utilizing the show interface command
Highlight A indicates layer 1 active
Highlight C also display T1 hardware control signal status
If interface is down/down, layer 1 problem
If interface is up/down, layer 2 problem (Highlight D)

5. Layer 2 - LMI
*Cisco Systems -

6. Step 2 – Layer 2
Verify Layer 2 Connectivity by utilizing the show interface command or show frame-relay lmi command
Both show LMI status message count.
Highlight B & C need to be incrementing
If LMI status messages not exchanging, verify LMI encapsulation type with carrier

7. PVC Status / DLCI

8. Step 2 – Layer 2 (cont’d)
Verify Layer 2 Connectivity (PVC) by utilizing the show frame-relay pvc command
Highlight B show PVC status
If PVC status is not active (inactive or deleted), verify DLCI number with carrier. Also ensure that carrier has indeed “turned-up” PVC.
The show command also provides details on packet counters and PVC “flapping”
Also verify frame-relay encapsulation type (Slide 3 – Highlight B)

9. Step 3 – Layer 3 Verify Layer 3 Connectivity by ping across link.
If successful, take a break you earned it..
If unsuccessful, verify
IP address assignments
IP routing
Verify inverse ARP or manual mappings

10. Questions:
If the output of “show interface serial 0/1 displays that the interface is down/down what should be your first course of action?
If the output of “show interface serial 0/1 displays that the interface is up/down describe what show commands you could utilize to determine the issue.

11. Questions (cont’d):
What are the possible Frame Relay interface encapsulation types on a Cisco router?
What are the possible Frame Relay LMI encapsulation types on a Cisco router?

12. Questions (cont’d):
Are DLCIs locally significant or globally significant?
What does NBMA stand for and how is it different than normal Ethernet?

13. Questions (cont’d): What side of the connection is the DTE?
What is the difference between an SVC and a PVC?

14. Questions (cont’d):
What are the primary ITU and ANSI standards / specifications related to Frame Relay?
What is the show command to display the information learned by Inverse ARP on a Cisco router?

15. Questions:
If the output of “show interface serial 0/1 displays that the interface is down/down what should be your first course of action?
Troubleshoot layer 1 / Contact Telco
If the output of “show interface serial 0/1 displays that the interface is up/down describe what show commands you could utilize to determine the issue.
show frame-relay pvc, show frame-relay lmi

16. Questions (cont’d):
What are the possible Frame Relay interface encapsulation types on a Cisco router?
Cisco, ietf
What are the possible Frame Relay LMI encapsulation types on a Cisco router?
Cisco, ansi, q933a

17. Questions (cont’d):
Are DLCIs locally significant or globally significant?
Locally
What does NBMA stand for and how is it different than normal Ethernet?
Non-broadcast multi-access. Does not support the use of broadcast frames/PDUs.

18. Questions (cont’d): What side of the connection is the DTE?
CPE / customer side
What is the difference between an SVC and a PVC?
Switched (i.e. on the fly) versus permanent (i.e. manual configuration by TELCO)

19. Questions (cont’d):
What are the primary ITU and ANSI standards / specifications related to Frame Relay?
Q.922, Q.933 (ITU) & T1.617 T1.618 (ANSI)
What is the show command to display the information learned by Inverse ARP on a Cisco router?
Show frame-relay map