December 2001
Intermediate to advanced
608 pages
25h 14m
English
Content preview from CISCO IOS in a NutshellBecome 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,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Serial Interfaces
Serial interfaces are interfaces that connect to a device like a CSU/DSU, which in turn connects to a leased line to complete a point-to-point connection.
Serial Encapsulation
The three primary
encapsulation types for a serial
interface are PPP, HDLC, and Frame Relay. Other encapsulation types
include X.25, SMDS, and ATM DXI. To see which encapsulation is being
used on a given interface, use the show
interface command. Here are brief descriptions of
the different encapsulation types:
- PPP
Point-to-Point Protocol (PPP) encapsulation is initially specified in RFC 1331 and 1332 (and many others). Echo requests are used as keepalives; use
no keepalivesto disable this feature. PPP is popular and supported by all router vendors. If you are creating a serial link with two different types of routers, you will need to use PPP for the two routers to communicate.- HDLC
HDLC encapsulation provides synchronous frames and error detection without windowing or retransmission. HDLC is the default encapsulation method for a serial interface, but it is proprietary to Cisco. If you build a serial link with a Cisco router at one end and another type of router at the other end, HDLC is not an option. You will have to use PPP.
If you can use HDLC, you will find that it is simpler to configure and slightly faster than PPP, because it is less general.
- Frame Relay
In Frame Relay, your packets are handled by a switched network that provides virtual circuits between you and the sites with ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.