August 2005
Intermediate to advanced
798 pages
31h 12m
English
Content preview from Cisco IOS in a Nutshell, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Name
encapsulation (interface) — interface
Synopsis
encapsulation type
encapsulation dot1q vlan-id [native]
encapsulation isl vlan-id
no encapsulationConfigures
Encapsulation method used by the interface
Default
Depends on interface
Description
This command sets the encapsulation method for this interface. Possible values for the encapsulation type are atm-dxi, bstun (block serial tunnel), dot1q, frame-relay (see Chapter 6), hdlc, isl, lapb, ppp, sde, dlc, and smds.
For Frame Relay interfaces, the options are cisco and ietf. The default is cisco, which is Cisco’s proprietary encapsulation method. ietf sets the encapsulation method to the IETF standard, which is used when connecting to another vendor’s Frame Relay router or switch.
For interfaces that are compatible, such as Fast Ethernet interfaces, you can enable dot1q to apply a VLAN ID to the interface. native is an optional keyword that sets the VLAN ID value of the port to the value specified by vlan-id. To enable ISL encapsulation on an interface, use the isl keyword followed by the VLAN ID you wish to use. For more information on dot1q and ISL encapsulation, see Chapter 14.
Example
The following code uses hdlc encapsulation on a serial line:
interface serial0 encapsulation hdlc
This code uses PPP on an ISDN line:
interface bri0 encapsulation ppp
This code sets vlan 101 to a subinterface:
interface fastethernet0/1.101 encapsulation dot1q 101
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.