When you're studying to transfer the Cisco CCNA and CCNP authorisation exams, you apace see that there's ever something added to learn. (You'll rattling garner up on this in your CCIE studies, consortium me!) Today we'll verify a countenance at an often-overlooked matter in Frame Relay, the encapsulation type. You don't just modify this on a regular foundation in creation networks (not if you poverty to meet employed, anyway!), but it's an essential communicating matter that you staleness be old with.
The DCE and DTE staleness concord on the LMI type, but there's added continuance that staleness be united upon by the digit DTEs bringing as the endpoints of the VC. The Frame encapsulation crapper be mitt at the choice of Cisco (which is Cisco-proprietary), or it crapper be denaturized to the industry-standard IETF, as shown below. If a non-Cisco router is the far endpoint, IETF encapsulation staleness be used. Note that the choice of Cisco isn't traded as an choice by IOS Help, so you meliorate undergo that digit by heart!
R1(config)#int s0
R1(config-if)#encap inclose ?
ietf Use RFC1490/RFC2427 encapsulation
R1(config-if)#encap inclose ietf
What if a fleshly programme is in ingest and whatever far hosts order Cisco encapsulation and others order IETF? The encapsulation identify crapper be organized on a per-PVC foundation as well. One encap identify crapper be utilised on the interface, and some transpose statements that order a assorted encap identify crapper hit that given in the pertinent transpose statement. In the mass example, every PVCs module ingest the choice Cisco encapsulation identify eliminate for arrhythmia 115. The inclose transpose evidence using that arrhythmia has ietf specified.
R1(config)#int s0/0
R1(config-if)#encap frame
R1(config-if)#frame transpose ip 172.12.123.3 123 broadcast
R1(config-if)#frame transpose ip 172.12.123.2 122 ietf broadcast
show inclose transpose shows us that the function to DLCI 123 is using Cisco encapsulation, and DLCI 122 is using IETF.
R1#show inclose map
Serial0 (up): ip 172.12.123.3 dlci 123(0x7B,0x1CB0), static
broadcast, CISCO, position defined, active
Serial0 (up): ip 172.12.123.2 dlci 122(0x7B,0x1CB0), static
broadcast, ietf, position defined, active
Just advert that Cisco is the default, and every PVCs module ingest Cisco unless you take IETF in the inclose transpose evidence itself. You could also modify the whole programme to ingest IETF for every mappings with the frame-relay encapsulation IETF command. For Cisco exams, as substantially as impact on creation networks, it's ever a beatific intent to undergo more than digit artefact to do something!
Chris Bryant, CCIE #12933, is the someone of The Bryant Advantage, bag of liberated CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.
You crapper also tie his RSS take and meet his blog, which is updated individual nowadays regular with newborn Cisco authorisation articles, liberated tutorials, and regular CCNA / CCNP communicating questions! Details are on the website.
For a FREE double of his stylish e-books, How To Pass The CCNA and How To Pass The CCNP, meet the website and download your liberated copies. You crapper also intend FREE CCNA and CCNP communicating questions every day! And reaching in 2007 -- Microsoft Vista authorisation from The Bryant Advantage
