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How well do you know the Cisco iOS?

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Hopefully in this video, I'm going to teach you some commands that you don't know.

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In this video.

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I'm going to show you some tips and tricks with regards to the Cisco iOS.

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Hopefully this will make you a better Cisco network engineer.

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A lot of these commands are available in the configurations fundamentals Configuration Guide Cisco have

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multiple examples of this guide that show you, for instance, the basics like context sensitive help

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Sealy editing shortcuts and features.

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But I'm going to show you some more advanced stuff.

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Please comment below this video and let me know at which point in the video you learn something.

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So let's see how far you can get through this video without learning something new.

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I'm running a genius three topology here.

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There are two routers and the switch.

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These are traditional Cisco routers as in they run traditional classic Cisco iOS show version shows

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me that the version of operating system that this router is using is 15.6 to TI.

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So classic traditional Cisco iOS.

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Nothing spectacular or exceptional about the Cisco iOS.

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These are Cisco viral images that I'm running within SE three.

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Okay.

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So let's start with something straight away.

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Show question mark.

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Now show here shows me a whole bunch of commands and I can scroll and scroll and scroll, but notice

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show question mark, I see more as an option.

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So I've simply typed show question mark.

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When more is displayed, I can use multiple options like forward slash.

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This allows me to filter, for instance for a keyword such as class.

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So that's what I've typed.

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iOS is faltering.

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The output of this show command to class map more is displayed.

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Once again, I can use forward slash and for instance search for rad as in radius.

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So all I did was type show question mark and notice the output is being filtered.

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Ford slash again.

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VPN.

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Output is filtered to web a VPN.

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Now you can use this with many commands such as show run.

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So an on top show run most displayed forward slash type something such as face.

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The output is faulted until face is found as in interface loopback 100 Moore's displayed forward slash.

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Let's look for something such as network.

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This is filtering the output until the first network statement.

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Now I've purposely used a sub command here rather than something such as router.

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So as an example, I could filter for t y.

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Now some people have said when I've shown them this previously that you can just type sho run pipe section

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and let's say router slash v t y as an example.

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And that will show you the router configuration and the VTI configuration.

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And that's true.

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I'm not trying to tell you which command is better than another.

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I'm trying to show you different options.

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This shows me the router sections as in router IP, router BGP, router OSPF.

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And here I've got v y.

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But notice when I type show run I could as an example filter the config for one keyword such as face.

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So that's like a section of configuration.

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But then I could filter for a different keyword, which could be a sub command such as 0.0.

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So that's filtering.

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To that, which is actually a regular expression.

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So let's do forward slash again and say zero backslash dot zero.

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So this is a regular expression saying Escape the special meaning of a dot.

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A dot is any single character.

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So that matched there.

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But I'm going to actually look for 0.0 and that's filtered down to here.

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So it's not a section of code.

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It's a sub command.

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And then I could filter for something else.

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Let's say log.

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This is showing me the configuration from a certain point.

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In this example banner login.

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But what you might have noticed is I've used, I think, four different search criteria in one show

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command.

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So I'm looking at output and I'm doing multiple searches on that output.

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The closest that you can get is perhaps begin.

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So show run, pipe begin and let's say log in.

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That will show me the running configuration from the word logging as in banner logging.

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But that's all it's going to give me.

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But note, I have more here so I could do a search for VTI or some other kind of keyword.

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It's not showing anything here because VTI was already displayed in.

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There's no VTI the remaining config.

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But what I could do is type show run, pipe, begin, face something further up in the configuration

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as an interface and then I could search for router.

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And then search for something else.

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V.

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T.

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Y.

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So the forward slash command is fantastic.

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It doesn't just work with showrun run.

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It basically works with any command where you've got more displayed.

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So here I typed show IP route Moore's displayed.

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So what I can do is use Ford slash and let's search for 172.

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The show IP rot output is filtered to 172 and then I could filter for something else.

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Let's say 192.168. 105.

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Output is filtered to that point in the IP route command.

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So Ford's really useful.

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Another one that you could use.

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No, please.

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I'm going to just do show question mark here.

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Now I'm going to use plus and let's.

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Search for Roku.

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This is filtering all that output to only show me show commands with Oro.

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You in them.

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Now you might say, Well, David, this is kind of pointless, but don't restrict your imagination.

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Look at what this command can do and then play around with different options and see what works for

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you.

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The moral of the story is with a command showing more you could either use forward slash or you could

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use plus.

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And another option is minus where I don't want to see certain commands, so I want to remove everything,

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let's say with ORU unit.

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Now that's not a great example.

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So let's do that with a routing command like show IP route.

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So show IP route.

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I don't want to see let's say 192 routes.

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The routing table here has been filtered to remove 192.

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And let me just show you the whole routing table to make the point.

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Show IP route, no filtering.

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We've got two routes.

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We've got ten routes.

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We've got 172 routes.

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We've got 192 routes in the routing table here.

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But if I type show IP route, I could say minus.

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Don't show me 172.

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Don't show me 192.

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I don't want to see those routes in the output of this command.

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Again, you could type show IP route pipe include well, let's do exclude, which is similar to minus

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one 72192.

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You could do it that way and that will show you equivalent output.

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In this method you are doing the command before showing the output in the other method.

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I'm typing a command when I see more, then I'm deciding what to exclude.

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And I can do that multiple times with a backslash.

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But I can't do that with a minus or plus, but with a backslash I could filter multiple times.

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Okay.

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So show run pipe.

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Begin is similar to forge slash include is similar to plus exclude is similar to minus.

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Okay.

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So that's some basic commands plus minus forward slash.

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You once again can do that with any commands.

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So I'll show you one more example and then wrap it up here in BGP, I can use question mark, BGP question

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mark gives me options.

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I could see BGP, question mark plus max.

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This only shows me.

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Commands with the max keyword in them.

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I filtered the output.

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And again wherever you are and you use question mark and I shouldn't be using show they let me just

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use question mark in global config mode with no options.

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Wherever you are here you can use forward slash plus minus.

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So arrow you as an example here shows me all commands in global config mode that have zero you in them

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either as the command or as the description of the command.

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So if you can just slightly remember what a command should give you, but you can't remember the exact

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command you can filter that way if you want to.

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Okay, but let's step it up a notch.

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Let's enable Linux commands directly on the Cisco iOS.

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Now I've discussed this command shell processing full in this video.

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If you want to see more details, have a look at this playlist.

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You can either enable this globally or you can just enable it on the current terminal.

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But what this allows me to do is it allows me to use Linux commands such as CAT.

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So show shell functions shows me options.

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GREP is a great one, which I'm going to show you right now.

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We've also got Interface, which I'll show you in a moment.

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You've also got NLL, which numbers any line in the output.

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Basically, there's a whole bunch of things we can do now that you can't typically do with Cisco, iOS,

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so include exclude.

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Commands like that are very limited here.

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We can do nested grips, all kinds of interesting things.

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So as an example, show IP Interface Brief gives me a list of interfaces on this router.

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So there's the command again, show IP interface, brief bunch of output on the router.

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So I'll just do that again.

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There's the command.

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Yeah, all the interfaces.

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But what I could do now is say grep and only show me interfaces that are up.

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So all those interfaces are up.

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This command shows me all up interfaces.

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Scrolling up to the previous command show IP interface brief shows me interfaces, but also shows me

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interfaces that are down.

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So these interfaces are currently done.

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But I can do.

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Nested groups now remove loop backs from that output.

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So show me all interfaces that are up, but remove loopback interfaces.

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Now, you could perhaps just do it this way.

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Show me all interfaces except loopback interfaces, but notice those interfaces are administratively

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down.

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Again, use your imagination.

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This is a positive match.

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This is an exclusion.

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So we basically doing an include and then an exclude.

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But let me show you some more commands that I haven't discussed in other videos.

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How about this?

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Show me the running configuration, but begin with 0/0.

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This is similar to begin, but I'm going to make it more complex in a moment.

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But.

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And let me push that to more because this is like Linux, so you can use more to show one page at a

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time.

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So that command that I run there shows the running configuration from this point, but it's showing

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the entire running configuration and it went by very quickly.

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If I push it to more, it's going to show me one page at a time.

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So there's the command showing one page of output at a time.

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But you could say, Well, I could just do that with Begin.

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Okay, but how about this?

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Show me the running configuration beginning at this point, but ending at router.

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So in other words, scrolling up, we're going to start at this point, but only show me until this

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point when we see routers stop the output.

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Okay, so let's try that show run pipe grep, begin zero zero grep you router.

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There's the output interface gigabit zero zero and notice it ended at the point specified ended at router.

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Now again, if you don't want it to scroll past, if you've got a lot of output, you can use more.

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So we're doing double grep sheer and pushing it to more to only show certain parts of the configuration.

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But you could say, David, I could just use section like section interface.

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But notice the difference with section interface.

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I am seeing loopback interfaces and then I'm seeing my gigabit interfaces.

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What I'm doing with grep here is I'm deciding which section of code I want to see.

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Could be a small piece of code, could be a long piece of code.

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And I'm not restricted by what I can search on.

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I could, for instance, search on a exclamation.

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So show me the output from zero zero until exclamation.

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Basically search on anything you want.

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Okay.

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So there you go.

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That did it.

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Didn't do it previously.

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Notice it started at gigabit 200, ended at exclamation y because when you do show run.

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And I'll use my Ford slush again.

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I like Ford slush.

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I showed the config from this point until this point.

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You basically have the power here to do what you want, search for whichever output you want.

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So let's do it from grep tool.

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Log in.

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I want to see all the output from zero zero until log in.

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So all the output from zero zero.

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So 0/0 interface gigabit zero zero until log in.

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So I see my interfaces, I see rotor and when I see log in it ends.

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So actually I should have done control plane there.

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So let's do plane because I don't want to get the banner.

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So show me all the configuration from 0/0 until plane.

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So there's interface gigabit to zero zero.

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Scrolling all the way down until plane.

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The plane control plane command is typically shown here in the output.

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But I've I don't want to see that.

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I just want to see up until that point.

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Okay.

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But grep is even more powerful.

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How about this?

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Typically commands or case sensitive, but I could say I so face I'm going to put in uppercase notice

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please.

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That face here is lowercase but I'm going to say ignore case.

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When you use section or include or one of those commands, it's case sensitive.

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So commands such as show run pipe include exclude or k sensitive.

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But yeah, I've told it.

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Show me the running configuration from face face being uppercase or lowercase.

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Don't k until plane.

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So I'm seeing all my loopback interfaces and then I'm seeing gigabit interfaces up to plane.

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Now if you're not sure about options notice man which is a linux command for manual grep shows me options

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so there's b match everything in a file after a pattern dash II or hyphen I ignore case you match everything

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until a certain pattern of V is invert.

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So typically when you do show run pipe include, you have to match the case here.

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But with grip you don't have to.

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So show run pipe include face.

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This matches all lines with the word face in it.

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I could say grep.

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I.

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And then my face can be any case I want.

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Doesn't matter what the case is.

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Yeah.

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That wouldn't work with include.

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So output is the same.

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But let's say I want to exclude my loop backs.

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So let's use a negative grep.

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So V says exclude loopback interfaces.

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So I'll use dash v loop.

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So show me the ethernet interfaces but exclude the loopback interfaces and there you go.

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I'm only seeing gigabit interfaces, so that's a really powerful option.

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Now, this video is unfortunately getting quite long, so I'm going to have to put the more advanced

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stuff that I wanted to show you in a separate video, but hopefully you found this useful again.

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Please comment below and let me know what you've learnt.

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At what time STEM did you actually learn something?

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Which commands did you learn?

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And as always, please, would you subscribe to my YouTube channel?

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Please, would you like this video if you found it useful?

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Please click on the bell to get notifications when I post a new video, we bought this.