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Okay for this question and on a blog I got a question from Remus.
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He asks What is the use of giving a default gateway to a switch using the IP default gateway command
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be remiss in this June 3 typology of a router connected to a layer 3 switch which in turn is connected
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to a lead to switch at least three switch has IP routing enabled.
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In other words it will rot from Villon one to violent two and back again switch to a late to switch.
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In other words it doesn't have IP writing enabled.
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So for the CCMA this could be a twenty nine fifty switch or 21:16 and this could be a 37 50 35 50 as
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an example.
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So on Router one is Rotto 1 able to ping switch to on trees.
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No the router is not able to ping switch to.
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What about trace and to speed things up I'm going to.
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No IP domain.
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Look-Up so trace route to tend and wondered wondered what.
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OK so the traffic gets to switch one so it goes from about a one to switch one tenth of 1 to 2 to 2
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5 4.
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And then the trace fails so cannot ping 10 1 2 5 4.
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Yes I can and I would have known that from the trace.
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But what I'd like to do is check the following.
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Can write a one paying the same IP address on the other side.
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Well switch one.
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Yes it can.
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So that means that the problem is not here.
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The problem is somewhere on the site so on switch one can we paying switch to.
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The answer is yes.
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On switch to Kennet paying switch one on villaine one.
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Yes it can.
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But Kennet paying a cross switch one remember one was able to ping this IP address in Villon one so
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switch one is going to be LAN routing but can switch to pings which ones IP address in violent too.
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And it looks like it can't this is a very typical Signoria way.
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You can't ping or telnet to a switch in a remote subnet.
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Now on the switch when we use the command show IP raht notice no default gateways being set.
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This means that IP writing has been disabled on the switch.
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So what I need to do is type IP default gateway and point the switch to its default gateway so show
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IP.
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Notice default gateway set told you that come on again is the default gateway.
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So on router 1 10 we paying switch to monsters yes.
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So you need to configure a default gateway on a late to switch.
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In other words a switch that hasn't got IP routing enabled to allow that switch to send traffic to remote
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subnets traffic from router one could get to switch to but won't be able to get back again if switch
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to doesn't have a default gateway configure it.
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Now this can get confusing if the switches the last three switch or supports Les's free functionality.
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Notice at the moment once again IP routing is disabled because we don't see a writing table here show
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run pipe include IP raat.
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Notice this command.
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No IP routing IP writing was disabled on the switch.
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That's a default on all the switches.
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So IP routing that's enabled that through the show IP wrapped.
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Come on again notice the output is very different.
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Notice also that the gateway of last resort is not set.
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So Ken wrote a one ping switch to answer his node show run pipe include default.
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We still have the IP default gateway command configured on the switch but because IP routing is enabled
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that command is ignored.
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So you only use the IP default gateway command when IP rodding is disabled so let's do that again.
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No IP routing
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pings succeeds IP routing
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Pingo file.
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So an IP routing is enabled like this.
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What you need to do is you need to create a default route to a default gateway so something like that
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and now routing works.
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So here's the thing to remember if IP routing is enabled on a switch you must use a static default drop
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like this will run a routing protocol if IP routing is disabled.
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He used the IP default gateway command to allow a switch to send traffic to a remote subnet remiss.
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I'm hoping that answers your question and I hope that helps everyone else.
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Don't forget to ask questions in the comments below.
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Please also look at the video and please subscribe.
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I want to wish you all the very best.
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