Cisco CCNA CCNP Certification Exam Frame Relay Encapsulation Types
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Cisco CCNA and CCNP Certification Exam: Frame Relay Encapsulation Types
Summary
Mastering Frame Relay encapsulation is crucial for passing your CCNA and CCNP exams. Chris Bryant, CCIE
12933, highlights key details you shouldn't overlook.
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Frame Relay Encapsulation for Cisco Exams
Preparing for the Cisco CCNA and CCNP exams reveals a continuous stream of new information, particularly evident when advancing to CCIE studies. A topic often overlooked but critical for these exams is Frame Relay encapsulation. Although rarely changed in daily operations, understanding encapsulation types is essential for your certification.
Key Concepts
For Frame Relay to work seamlessly, both the DCE and DTE must agree on the LMI type and encapsulation value. You have two choices: the default Cisco-proprietary encapsulation or the industry-standard IETF. If the remote endpoint is a non-Cisco router, you must use IETF encapsulation. Remember, the default Cisco encapsulation isn't displayed in IOS Help, so memorization is key.
Here's how you configure it:
```plaintext
R1(config)
int s0
R1(config-if)encap frame ?
ietf Use RFC1490/RFC2427 encapsulationR1(config-if)
encap frame ietf
```Configuring Mixed Encapsulation Types
What if you need different encapsulation types for various remote hosts? You can configure encapsulation on a per-PVC basis. While the interface may use the default Cisco encapsulation, you can specify a different type for certain map statements. In this example, all PVCs use Cisco's default encapsulation except PVC 115, which uses IETF:
```plaintext
R1(config)
int s0/0
R1(config-if)encap frame
R1(config-if)frame map ip 172.12.123.3 123 broadcast
R1(config-if)frame map ip 172.12.123.2 122 ietf broadcast
```Verification
Use the `show frame map` command to confirm configurations:
```plaintext
R1
show frame map
Serial0 (up): ip 172.12.123.3 dlci 123(0x7B,0x1CB0), staticbroadcast, CISCO, status defined, active
Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, status defined, active
```
Conclusion
Remember that Cisco is the default encapsulation type, and unless specified, all PVCs will use it. You can switch all mappings to IETF by using the `frame-relay encapsulation ietf` command. Whether for exams or real-world applications, knowing multiple methods is always advantageous.
You can find the original non-AI version of this article here: Cisco CCNA CCNP Certification Exam Frame Relay Encapsulation Types.
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